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Artículos de revistas sobre el tema "Metal complexes and nanoparticles"

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Autor: Grafiati
Publicado: 6 de septiembre de 2023

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1

Bharadwaj, Namita y Jaishri Kaushik. "Nano Synthesis and Characterization of Complex Derived from Silver Metal Conjugated with Midodrine Hydrochloride". Oriental Journal Of Chemistry 37, n.º 1 (28 de febrero de 2021): 157–61. http://dx.doi.org/10.13005/ojc/370121.

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The stability constant Kf for the complexation of Ag(Ⅰ) metal ion with Midodrine hydrochloride were determinedby spectrophotometric method at room temperature .The colored complexes were measured at 300 nm. The stability constant of the complexes were found to be 5.47 by mole ratio method. The stoichiometry of the complexes formed between the Midodrine drug and Ag (Ⅰ) metal ion are 1:1 M/L ratio. Silver conjugated Midodrine hydrochloride Nano synthesized and characterized by UV/Visible spectroscopy, SEM, XRD and FT-IR. The UV/Visible spectra of Midodrine –Ag nanoparticle in the range of 322 nm. XRD conformThe crystallite size of Midodrine - Ag (Ⅰ) nanoparticles are found to be 64.5 nmfrom Debye Scherer formula.Thecrystallinity of nanoparticles is Face centered cubic structure. SEM conform of particle size and surface morphology, FTIR analyzed involvement of -NH2 group in Midodrine is the stabilized of silver nanoparticle. This research is focuses on complexation, Nano synthesis and characterization of Drug-silver nanoparticle for antihypotention therapy.
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2

Masilela, Nkosiphile, Edith Antunes y Tebello Nyokong. "Axial coordination of zinc and silicon phthalocyanines to silver and gold nanoparticles: an investigation of their photophysicochemical and antimicrobial behavior". Journal of Porphyrins and Phthalocyanines 17, n.º 06n07 (junio de 2013): 417–30. http://dx.doi.org/10.1142/s1088424613500016.

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This work reports on the axial coordination of zinc phthalocyanine and bis-(1,6-hexanedithiol) silicon phthalocyanine to silver and gold nanoparticles. Red shifting of absorption spectra of the phthalocyanine complexes was observed after conjugation with the nanoparticles. An improvement in the photophysicochemical behavior and antimicrobial activity was achieved in the presence of metal nanoparticles for both complexes. A decrease in triplet lifetimes was observed for all the phthalocyanine metal nanoparticle conjugates. The Zn phthalocyanine complex gave the highest triplet and singlet oxygen quantum yield in the presence of gold nanoparticles. On the other hand, the bacterial inhibition was found to be best for the Si phthalocyanine derivative in the presence of nanoparticles compared to the Zn phthalocyanine counterpart. The highest antimicrobial activity was achieved for both conjugates against B. subtilis compared to S. aureaus both in the dark and under illumination with light.
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3

Bergamini, Giacomo y Paola Ceroni. "Metal complexes and nanoparticles for energy upconversion". Dalton Transactions 47, n.º 26 (2018): 8507–8. http://dx.doi.org/10.1039/c8dt90101e.

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4

Revaprasadu, N. y S. N. Mlondo. "Use of metal complexes to synthesize semiconductor nanoparticles". Pure and Applied Chemistry 78, n.º 9 (1 de enero de 2006): 1691–702. http://dx.doi.org/10.1351/pac200678091691.

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Research in materials with dimensions of the order of nanometers has made a huge impact on the scientific community in the past decade. Chemists play an important role in this area of research as they endeavor to prepare pure, crystalline, surface-derivatized nanoparticles, which can be processed in potential applications. This review describes some of the routes to nanoparticles with particular emphasis on the use of metal complexes in the preparation of high-quality nanoparticles. The synthesis of II/VI semiconductor nanoparticles such as CdSe, CdS, ZnS, and PbS using the single molecular precursor route is reviewed in detail. The synthesis of some III/V semiconductor materials is also briefly discussed. Finally, current work on the shape control of nanoparticles is described. The mechanism of growth induced by variation of reaction conditions is discussed using CdSe nanoparticles as an example.
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5

Savita Belwal, Sujana Kariveda, Saritha Ramagiri, Swathi A, Shubham Kute y Suryam Goud. "The anti-malignant activity of Macrotyloma uniflorum mediated green synthesized Cu and Zn metal-ligand nano complexes". International Journal of Research in Pharmaceutical Sciences 11, SPL4 (21 de diciembre de 2020): 1573–80. http://dx.doi.org/10.26452/ijrps.v11ispl4.4340.

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The green biological route has been employed to convert macro-sized zinc and copper metal complexes into nano-sized metal complexes. These bioactive metal complexes were synthesized by template condensation process in the chemistry laboratory. The newly synthesized biologically active complexes were converted into nano range from phytochemical aqueous extract of Macrotyloma uniflorum (horse gram). Biologically converted nano complexes have been characterized by physicochemical as well as spectroscopic techniques such as UV-visible spectrophotometer and FTIR. The reduced Cu and Zn metal nanoparticles were analyzed with SEM for shape and size, which showed most of the nanoparticles, were nearly spherical with nano range size. To estimate the potentiality of newly manufactured copper and zinc nanoparticles in vitro and in in vivo studies, i.e. antifungal and antibacterial and anti-cancer activities were performed. The biogenic nanoparticles of Cu and Zn were evaluated for their activity on cancer A-549 cell lines by standard MTT assay for metabolically active mitochondria and cell viability. Further flow cytometric studies showed Cu, and Zn nano complexes had inhibition efficacy of cancer cells compared to normal cells. This study elevates that biosynthesized Cu & Zn nano complexes can be an alternative for the treatment of cancer.
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6

Zhou, Meng, Chenjie Zeng, Qi Li, Tatsuya Higaki y Rongchao Jin. "Gold Nanoclusters: Bridging Gold Complexes and Plasmonic Nanoparticles in Photophysical Properties". Nanomaterials 9, n.º 7 (28 de junio de 2019): 933. http://dx.doi.org/10.3390/nano9070933.

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Recent advances in the determination of crystal structures and studies of optical properties of gold nanoclusters in the size range from tens to hundreds of gold atoms have started to reveal the grand evolution from gold complexes to nanoclusters and further to plasmonic nanoparticles. However, a detailed comparison of their photophysical properties is still lacking. Here, we compared the excited state behaviors of gold complexes, nanolcusters, and plasmonic nanoparticles, as well as small organic molecules by choosing four typical examples including the Au10 complex, Au25 nanocluster (1 nm metal core), 13 diameter Au nanoparticles, and Rhodamine B. To compare their photophysical behaviors, we performed steady-state absorption, photoluminescence, and femtosecond transient absorption spectroscopic measurements. It was found that gold nanoclusters behave somewhat like small molecules, showing both rapid internal conversion (<1 ps) and long-lived excited state lifetime (about 100 ns). Unlike the nanocluster form in which metal–metal transitions dominate, gold complexes showed significant charge transfer between metal atoms and surface ligands. Plasmonic gold nanoparticles, on the other hand, had electrons being heated and cooled (~100 ps time scale) after photo-excitation, and the relaxation was dominated by electron–electron scattering, electron–phonon coupling, and energy dissipation. In both nanoclusters and plasmonic nanoparticles, one can observe coherent oscillations of the metal core, but with different fundamental origins. Overall, this work provides some benchmarking features for organic dye molecules, organometallic complexes, metal nanoclusters, and plasmonic nanoparticles.
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7

Ghavam, Mansureh, Dara Dastan, Elaheh Fadaei y Gholamabbas Chehardoli. "Synthesis of Gadolinium Complexes Using Medicinal Plant Extracts". Avicenna Journal of Pharmaceutical Research 2, n.º 2 (30 de diciembre de 2021): 44–48. http://dx.doi.org/10.34172/ajpr.2021.09.

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Background: Gadolinium compounds are used as contrast enhancers in MRI imaging. Generally, free metal ions are not used in MRI imaging due to their toxicity. To reduce the toxicity of the free form of the metal, complexing agents are employed for making nanoparticles. Due to their low toxicity and natural abundance, plant extracts having potential to function as chelating agents are good alternatives for the formation of gadolinium nanoparticles. Methods: Aqueous extracts of five plant species, including Thymus daenensis Celak, Nepeta sessilifolia Bung, Crocus sativus L., Salvia hydrangea DC. ex Benth, and Hymenocrater incanus Bunge were prepared. Five complexes were produced as the result of each extract’s reaction with gadolinium nitrate solution in the presence of 1 mM solution of NaOH. The obtained complexes were analyzed adopting the Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Energy dispersive x-ray analysis (EDAX) techniques. Results: EDAX analysis of the obtained complexes confirmed the presence of gadolinium in all complexes. Among the five complexes, the highest percentage of gadolinium (21.07) was recorded for the complex derived from the extract of H. incanus Bunge, while the lowest one (9.33) was detected for the complex derived from the T. daenensis Celak. Despite adopting various methods to disperse the complex particles in deionized water in order for determining the particle size, the high adhesion of the particles prevented the determination of the desired particle size in nanoscale. Conclusion: Although synthesizing the complexes was successful and EDAX confirmed the presence of gadolinium metal in them, SEM analysis failed to prove their nanoparticle structure. The high tendency of solid particles to adhere was found to prevent the formation of independent nanoparticles in solution.
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8

Lastra, Ruben O., Tatjana Paunesku, Barite Gutama, Filiberto Reyes, Josie François, Shelby Martinez, Lun Xin et al. "Protein Binding Effects of Dopamine Coated Titanium Dioxide Shell Nanoparticles". Precision Nanomedicine 2, n.º 4 (2 de octubre de 2019): 393–438. http://dx.doi.org/10.33218/prnano2(4).190802.1.

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Non-targeted nanoparticles are capable of entering cells, passing through different subcellular compartments and accumulating on their surface a protein corona that changes over time. In this study, we used metal oxide nanoparticles with iron-oxide core covered with titanium dioxide shell (Fe3O4@TiO2), with a single layer of covalently bound dopamine covering the nanoparticle surface. Mixing nanoparticles with cellular protein isolates showed that these nanoparticles can form complexes with numerous cellular proteins. The addition of non-toxic quantities of nano-particles to HeLa cell culture resulted in their non-specific uptake and accumulation of protein corona on nanoparticle surface. TfRC, Hsp90 and PARP were followed as representative protein components of nanoparticle corona; each protein bound to nanoparticles with different affinity. The presence of nanoparticles in cells also mildly modulated gene expression on the level of mRNA. In conclusion, cells exposed to non-targeted nanoparticles show subtle but numerous changes that are consistent from one experiment to another.
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9

Alarcón-Correa, Mariana, Tung-Chun Lee y Peer Fischer. "Dynamic Inclusion Complexes of Metal Nanoparticles Inside Nanocups". Angewandte Chemie International Edition 54, n.º 23 (8 de mayo de 2015): 6730–34. http://dx.doi.org/10.1002/anie.201500635.

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10

Alarcón-Correa, Mariana, Tung-Chun Lee y Peer Fischer. "Dynamic Inclusion Complexes of Metal Nanoparticles Inside Nanocups". Angewandte Chemie 127, n.º 23 (8 de mayo de 2015): 6834–38. http://dx.doi.org/10.1002/ange.201500635.

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11

Pekarik, Vladimir, Marie Peskova, Roman Guran, Jiri Novacek, Zbynek Heger, Konstantinos Tripsianes, Jitender Kumar y Vojtech Adam. "Visualization of stable ferritin complexes with palladium, rhodium and iridium nanoparticles detected by their catalytic activity in native polyacrylamide gels". Dalton Trans. 46, n.º 40 (2017): 13690–94. http://dx.doi.org/10.1039/c7dt02818k.

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12

Bao, Xuefei, Xu Li, Chunfeng Jiang, Wei Xiao y Guoliang Chen. "Recent advances in catalysts for the Henry reaction". Australian Journal of Chemistry 75, n.º 10 (8 de noviembre de 2022): 806–19. http://dx.doi.org/10.1071/ch22136.

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The Henry reaction, the coupling of a nitro alkane and a carbonyl group, is an important C–C bond-forming reaction giving nitro alkanols, which are useful, versatile intermediates in synthetic organic chemistry and for the pharmaceutical industry. Among the catalysts employed in the Henry reaction, transition metal complex catalysts play an important role. Transition metal complexes, including small molecules and nanoparticles, catalyze the asymmetric Henry reaction efficiently and in most of the cases give chiral nitro alkanol products in good yield and enantiomeric excess. This review summarizes transition metal complex catalysts, metal-free organic catalysts and nanoparticle catalysts for the Henry reaction.
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13

Abate, Chiara, Federica Carnamucio, Ottavia Giuffrè y Claudia Foti. "Metal-Based Compounds in Antiviral Therapy". Biomolecules 12, n.º 7 (3 de julio de 2022): 933. http://dx.doi.org/10.3390/biom12070933.

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In recent years, the study of metal complexes and metal-based nanomaterials has aroused particular interest, leading to the promotion of new effective systems for the abatement of various viral diseases. Starting from the analysis of chemical properties, this review focuses on the employment of metal-based nanoparticles as antiviral drugs and how this interaction leads to a substantial enhancement in antiviral activity. The use of metal-based antiviral drugs has also spread for the formulation of antiviral vaccines, thanks especially to the remarkable adjuvant activities of some of the metal complexes. In particular, the small size and inert nature of Au- and Ag-based nanoparticles have been exploited for the design of systems for antiviral drug delivery, leading to the development of specific and safe therapies that lead to a decrease in side effects.
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14

Prestianni, Lucas, Eric R. Espinal, Sarah F. Hathcock, Nadine Vollmuth, Pixiang Wang, Robert A. Holler, Shaoyang Liu, Brandon J. Kim y Yuping Bao. "Synthesis and Characterization of Quercetin–Iron Complex Nanoparticles for Overcoming Drug Resistance". Pharmaceutics 15, n.º 4 (23 de marzo de 2023): 1041. http://dx.doi.org/10.3390/pharmaceutics15041041.

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Quercetin, one of the major natural flavonoids, has demonstrated great pharmacological potential as an antioxidant and in overcoming drug resistance. However, its low aqueous solubility and poor stability limit its potential applications. Previous studies suggest that the formation of quercetin-metal complexes could increase quercetin stability and biological activity. In this paper, we systematically investigated the formation of quercetin-iron complex nanoparticles by varying the ligand-to-metal ratios with the goal of increasing the aqueous solubility and stability of quercetin. It was found that quercetin-iron complex nanoparticles could be reproducibly synthesized with several ligand-to-iron ratios at room temperature. The UV-Vis spectra of the nanoparticles indicated that nanoparticle formation greatly increased the stability and solubility of quercetin. Compared to free quercetin, the quercetin-iron complex nanoparticles exhibited enhanced antioxidant activities and elongated effects. Our preliminary cellular evaluation suggests that these nanoparticles had minimal cytotoxicity and could effectively block the efflux pump of cells, indicating their potential for cancer treatment.
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15

Arefina, Irina A., Danil A. Kurshanov, Anna A. Vedernikova, Denis V. Danilov, Aleksandra V. Koroleva, Evgeniy V. Zhizhin, Aleksandr A. Sergeev, Anatoly V. Fedorov, Elena V. Ushakova y Andrey L. Rogach. "Carbon Dot Emission Enhancement in Covalent Complexes with Plasmonic Metal Nanoparticles". Nanomaterials 13, n.º 2 (4 de enero de 2023): 223. http://dx.doi.org/10.3390/nano13020223.

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Carbon dots can be used for the fabrication of colloidal multi-purpose complexes for sensing and bio-visualization due to their easy and scalable synthesis, control of their spectral responses over a wide spectral range, and possibility of surface functionalization to meet the application task. Here, we developed a chemical protocol of colloidal complex formation via covalent bonding between carbon dots and plasmonic metal nanoparticles in order to influence and improve their fluorescence. We demonstrate how interactions between carbon dots and metal nanoparticles in the formed complexes, and thus their optical responses, depend on the type of bonds between particles, the architecture of the complexes, and the degree of overlapping of absorption and emission of carbon dots with the plasmon resonance of metals. For the most optimized architecture, emission enhancement reaching up to 5.4- and 4.9-fold for complexes with silver and gold nanoparticles has been achieved, respectively. Our study expands the toolkit of functional materials based on carbon dots for applications in photonics and biomedicine to photonics.
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16

Mahmood, Atheer Abdulraheem, Oday Atta Hammadi y Kais Rzaik Ibraheem. "Preparation and Photoluminescence Spectra of Organometallic Complexes Containing Nanoparticles as Random Gain Media". Indonesian Journal of Chemistry 22, n.º 1 (17 de enero de 2022): 205. http://dx.doi.org/10.22146/ijc.68822.

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This work prepared organometallic complexes from the 8-hydroxyquinoline ligand linked to metal ions such as Ba2+, Ca2+, and Zn2+. The effects of metal ion type and adding nanoparticles to the complex solution on the absorption and photoluminescence characteristics of the prepared complexes were introduced. These nanoparticles were added to the prepared complex solutions to act as scattering centers to form random gain media with emission in the visible region of the electromagnetic spectrum. The random gain media made from the Znq2 complex with nanoparticles showed the best characteristics with good chemical and spectroscopic stabilities, high reliability, and reproducibility in addition to the low production cost and reasonably simple requirements.
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17

Huynh, Lana T., Stephanie N. Bonvicini, Arthur C. Pinon y Simon Trudel. "Nanocrystalline alloys: synthesis and characterization of non-stoichiometric Co2FeAl nanocrystals". Canadian Journal of Chemistry 94, n.º 4 (abril de 2016): 367–72. http://dx.doi.org/10.1139/cjc-2015-0352.

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Non-stoichiometric Co2FeAl nanoparticles are formed by the in-solution thermal decomposition of the corresponding metal acetylacetonate complexes in the presence of capping ligands followed by reduction of the obtained material under an H2-containing atmosphere. Transmission electron microscopy indicates that sub-100 nm nanoparticles are obtained, with reasonable size control. Magnetic measurements indicate that the saturation magnetization, Bloch behavior, magnetization reversal, spin-wave stiffness, and exchange stiffness are all comparable to those observed for bulk and thin-film Co2FeAl, indicating that these nanomaterials are promising for use in nanoparticle-based spintronic devices.
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18

Town, Raewyn M. y Herman P. van Leeuwen. "Labilities of aqueous nanoparticulate metal complexes in environmental speciation analysis". Environmental Chemistry 11, n.º 2 (2014): 196. http://dx.doi.org/10.1071/en13138.

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Environmental context Sorbing nanoparticles can have a significant effect on the speciation of small ions and molecules in the environment. The reactivity of nanoparticulate-bound species can differ significantly from that of their molecular or colloidal counterparts. We present a conceptual framework that describes the chemodynamics and lability of nanoparticulate metal complexes over a wide range of experimental timescales and environmental conditions. Abstract An inherent property of a dispersion of charged nanoparticles is that their charges and reactive sites are spatially confined to the particle body which is at a different potential from that in the bulk medium. This feature has important consequences for the reactivity of nanoparticulate complexants: the diffusive rate of reactant supply is lower as compared to molecular complexants, whereas the local concentration of reactant ions may be enhanced if the particle’s electric field has the opposite charge sign. These effects are most dramatic for soft nanoparticles for which the electrostatic accumulation mechanisms operate on a 3-D level. We show how the interplay of these effects governs the reactivity of charged nanoparticulate metal complexes (M-NPs) at the surface of an analytical speciation sensor. A theoretical framework is presented that describes the lability of M-NP species over a range of effective timescales for different electrochemical and other dynamic speciation analysis techniques. The concepts are illustrated by electrochemical stripping data on metal complexes with natural soft nanoparticles of humic acid.
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19

Ashurov, N. Sh, S. M. Yugai, A. A. Atakhanov, N. R. Vakhidova y S. Sh Rashidova. "Study of the magnetic properties of nanostructural metal complexes of chitosan". Journal of Physics: Conference Series 2388, n.º 1 (1 de diciembre de 2022): 012007. http://dx.doi.org/10.1088/1742-6596/2388/1/012007.

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Abstract Nanostructured polymeric metal complexes based on chitosan with Co2+, Mn2+, Cu2+ have been obtained. The role of the precipitant in the formation of nanoparticles with certain sizes is shown. Optimal morphologies for the creation of new and promising nanostructured metal-polymer materials with magnetic properties have been identified. A correlation has been established between the magnetic characteristics of polymeric metal complexes based on chitosan with metal ions of the 3-d transition series with their structural features.
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20

Wilton-Ely, James D. E. T. "The surface functionalisation of gold nanoparticles with metal complexes". Dalton Trans., n.º 1 (2008): 25–29. http://dx.doi.org/10.1039/b714144k.

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21

Previtera, Elia, Antoine Tissot, Robert W. Johns y Andreas Hauser. "Directional Energy Migration in Nanoparticles of Crystalline Metal Complexes". Advanced Materials 27, n.º 11 (4 de febrero de 2015): 1832–36. http://dx.doi.org/10.1002/adma.201405179.

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22

Alarcón-Correa, Mariana, Tung-Chun Lee y Peer Fischer. "Frontispiece: Dynamic Inclusion Complexes of Metal Nanoparticles Inside Nanocups". Angewandte Chemie International Edition 54, n.º 23 (27 de mayo de 2015): n/a. http://dx.doi.org/10.1002/anie.201582361.

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23

Alarcón-Correa, Mariana, Tung-Chun Lee y Peer Fischer. "Frontispiz: Dynamic Inclusion Complexes of Metal Nanoparticles Inside Nanocups". Angewandte Chemie 127, n.º 23 (27 de mayo de 2015): n/a. http://dx.doi.org/10.1002/ange.201582361.

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24

Bulushev, Dmitri A. "Progress in Catalytic Hydrogen Production from Formic Acid over Supported Metal Complexes". Energies 14, n.º 5 (1 de marzo de 2021): 1334. http://dx.doi.org/10.3390/en14051334.

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Formic acid is a liquid organic hydrogen carrier giving hydrogen on demand using catalysts. Metal complexes are known to be used as efficient catalysts for the hydrogen production from formic acid decomposition. Their performance could be better than those of supported catalysts with metal nanoparticles. However, difficulties to separate metal complexes from the reaction mixture limit their industrial applications. This problem can be resolved by supporting metal complexes on the surface of different supports, which may additionally provide some surface sites for the formic acid activation. The review analyzes the literature on the application of supported metal complexes in the hydrogen production from formic acid. It shows that the catalytic activity of some stable Ru and Ir supported metal complexes may exceed the activity of homogeneous metal complexes used for deposition. Non-noble metal-based complexes containing Fe demonstrated sufficiently high performance in the reaction; however, they can be poisoned by water present in formic acid. The proposed review could be useful for development of novel catalysts for the hydrogen production.
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25

Xu, Xiuling, Fan Hu y Qi Shuai. "Facile synthesis of highly biocompatible folic acid-functionalised SiO2nanoparticles encapsulating rare-earth metal complexes, and their application in targeted drug delivery". Dalton Transactions 46, n.º 44 (2017): 15424–33. http://dx.doi.org/10.1039/c7dt03000b.

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Herein, we report the facile synthesis of highly biocompatible folic acid-functionalized SiO2nanoparticles encapsulating rare-earth metal complexes, and their application in targeted metal complex delivery.
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26

Absalan, Yahya y Olga V. Kovalchukova. "Synthesizing Zro2 Nanoparticle as a Catalyst Through Thermal Decomposition of Phenol-Zirconium Complexes in Order to Degradation of Harmful Organic Substances Under UV Light". International Journal of Engineering & Technology 7, n.º 2.23 (20 de abril de 2018): 472. http://dx.doi.org/10.14419/ijet.v7i2.23.15336.

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This research was focused on synthesizing 3 zirconium complexes with phenol ligand and preparing ZrO2 from synthesized complex through the method of thermal decomposition was the result of the work. Nanoparticles of ZrO2 were synthesized after the complexes were decomposed in autoclaves at varies temperatures according to the different ligands.FT-IR spectroscopy, UV-Vis spectroscopy, chemical analyzing and metal analyzing were used for investigating the complex as analyzing methods.Furthermore, for the obtained nanoparticle, XRD, UV–Vis, FESEM and EDAX analyses were chosen for analyzing. Based on the result, synthesized ZrO2 are able to remove harmful organic compounds under UV light.
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27

Yang, Changjin, Doo Jin Lee, Hyunhong Kim, Kangyong Kim, Jinwhan Joo, Won Bae Kim, Yong Bae Song, Yoon Seok Jung y Jongnam Park. "Synthesis of nano-sized urchin-shaped LiFePO4 for lithium ion batteries". RSC Advances 9, n.º 24 (2019): 13714–21. http://dx.doi.org/10.1039/c9ra00897g.

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In this article, the facile synthesis of sea urchin-shaped LiFePO4 nanoparticles by thermal decomposition of metal-surfactant complexes and application of these nanoparticles as a cathode in lithium ion secondary batteries is demonstrated.
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28

Duval, Jérôme F. L. "Chemodynamics of metal ion complexation by charged nanoparticles: a dimensionless rationale for soft, core–shell and hard particle types". Physical Chemistry Chemical Physics 19, n.º 19 (2017): 11802–15. http://dx.doi.org/10.1039/c7cp01750b.

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Zaichenko, Alexander, Natalya Mitina, Oleh Shevchuk, Katerina Rayevska, Volodymyr Lobaz, Taras Skorokhoda y Rostyslav Stoika. "Development of novel linear, block, and branched oligoelectrolytes and functionally targeting nanoparticles". Pure and Applied Chemistry 80, n.º 11 (1 de enero de 2008): 2309–26. http://dx.doi.org/10.1351/pac200880112309.

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The objective of the present study is development of novel surface-active block, comb-like, and branched copolymers with peroxide-containing chains, as well as derived functional luminescent and magnetic nanoparticles. The main experimental approaches are based on tailored synthesis of the oligoperoxide surfactants of desired structures and derived coordinating complexes of transitional and rare earth elements. Oligoperoxide-based synthesis of luminescent, magnetic, and other functional nanocomposites with controlled size distribution, functionality, reactivity, and biocompatibility is described. Developed methods provide combining the formation of polymeric, metal, and metal-oxide nanoparticles with irreversible modification of their surface by functional fragments capable of radical and other reactions, including binding of physiologically active substances. Novel nanoparticles were studied by chemical, colloidal-chemical, and rheological methods, X-ray diffraction technique, luminescent spectroscopy, and transmission and scanning electronic microscopy. The availability of ditertiary peroxide fragments on the nanoparticle surface provides a possibility of radical grafting functional polymer chains. The developed functional nanoparticles have been used for phagocytosis measurement, as well as markers of pathological cells, antimicrobial remedies, and nanocarriers for targeted drug delivery.
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30

Lyagin, Ilya, Nikolay Stepanov, George Frolov y Elena Efremenko. "Combined Modification of Fiber Materials by Enzymes and Metal Nanoparticles for Chemical and Biological Protection". International Journal of Molecular Sciences 23, n.º 3 (25 de enero de 2022): 1359. http://dx.doi.org/10.3390/ijms23031359.

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To obtain fiber materials with pronounced chemical-biological protection, metal (Zn or Ta) nanoparticles were jointly applied with polyelectrolyte complexes of enzymes and polypeptides being their stabilizers. Computer modeling revealed the preferences between certain polyelectrolyte partners for N-acyl-homoserine lactone acylase and hexahistidine-tagged organophosphorus hydrolase (His6-OPH) possessing the quorum quenching (QQ) behavior with bacterial cells. The combinations of metal nanoparticles and enzymes appeared to function better as compared to the combinations of the same QQ-enzymes with antibiotics (polymyxins), making it possible to decrease the applied quantities by orders of magnitude while giving the same effect. The elimination of Gram-positive and Gram-negative bacterial cells from doubly modified fiber materials notably increased (up to 2.9-fold), whereas His6-OPH retained its hydrolytic activity in reaction with organophosphorus compounds (up to 74% of initially applied activity). Materials with the certain enzyme and Zn nanoparticles were more efficient against Bacillus subtilis cells (up to 2.1-fold), and Ta nanoparticles acted preferentially against Escherichia coli (up to 1.5-fold). Some materials were proved to be more suitable for combined modification by metal nanoparticles and His6-OPH complexes as antimicrobial protectants.
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31

Rogers, Charles Edward, Katey M. Sheets y Jason J. Keleher. "The Significance of Organometallic Complexes in the Photochemical Reduction of Cu2+ Onto Semiconductor Scaffolds". ECS Meeting Abstracts MA2022-02, n.º 64 (9 de octubre de 2022): 2391. http://dx.doi.org/10.1149/ma2022-02642391mtgabs.

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Metal-metal oxide nanoparticles (MMO-NP) show promise as an alternative to diffusive topical antibiotics as they are capable of slowly releasing metal ions upon contact-activated oxidation which promotes toxicity to prokaryotes. Modification of semiconducting nanoparticles with metals also has great relevance in terms of increasing the photocatalytic activity of the particles, which are inherently limited in practicality due to their large band gap energies. The use of semiconductor nanoparticles for the reduction of metal ions has been widely explored, however, more work needs to be done to make the reduction of metal ions like Cu2+ more facile. This work will focus on the mechanism and efficacy of incorporating Cu2+ into organometallic complexes for the photoreduction of Cu2+ on the surface of TiO2 and ZnO. The mechanistic contribution of bidentate complexes of Cu2+ in the complete reduction of Cu2+ will be explored. The implementation of L-serine (SER), L-arginine (ARG), and glucono-delta-lactone (GDL) as ligands will be observed. Initial results show that the coordination of Cu2+ into an organometallic complex provides an effective medium for the delivery of Cu2+ to the surface of TiO2. Spectroscopic analysis will be used to determine if the ligands contribute to the two-electron reduction via ligand to metal charge transfer (LMCT) or via non-covalent interactions that increase the effective concentration of Cu2+ at the nanoparticle surface. The surface modification of TiO2 will be observed post-reaction with scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) and atomic absorption spectroscopy (AAS) to measure copper content on the surface. Antimicrobial effectiveness will be characterized via Kirby Bauer testing as well as single cell optical imaging, with E. coli being the model microbe. Photocatalytic activity will be observed via the degradation kinetics of model pollutants. Preliminary results indicate that the addition of ligands greatly increased the yield of reduced copper at low pH and that there is some extent of control over the copper ion leaching as Kirby Bauer tests showed no zones of inhibition.
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32

Ruggiero, Emmanuel, Silvia Alonso-de Castro, Abraha Habtemariam y Luca Salassa. "Upconverting nanoparticles for the near infrared photoactivation of transition metal complexes: new opportunities and challenges in medicinal inorganic photochemistry". Dalton Transactions 45, n.º 33 (2016): 13012–20. http://dx.doi.org/10.1039/c6dt01428c.

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33

Hodge, Stephen A., Hui Huang Tay, David B. Anthony, Robert Menzel, David J. Buckley, Patrick L. Cullen, Neal T. Skipper, Christopher A. Howard y Milo S. P. Shaffer. "Probing the charging mechanisms of carbon nanomaterial polyelectrolytes". Faraday Discuss. 172 (2014): 311–25. http://dx.doi.org/10.1039/c4fd00043a.

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Chemical charging of single-walled carbon nanotubes (SWCNTs) and graphenes to generate soluble salts shows great promise as a processing route for electronic applications, but raises fundamental questions. The reduction potentials of highly-charged nanocarbon polyelectrolyte ions were investigated by considering their chemical reactivity towards metal salts/complexes in forming metal nanoparticles. The redox activity, degree of functionalisation and charge utilisation were quantified via the relative metal nanoparticle content, established using thermogravimetric analysis (TGA), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and X-ray photoelectron spectroscopy (XPS). The fundamental relationship between the intrinsic nanocarbon electronic density of states and Coulombic effects during charging is highlighted as an important area for future research.
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34

Siemeling, Ulrich, Frauke Bretthauer, Clemens Bruhn, Tim-Patrick Fellinger, Wah-Leung Tong y Michael C. W. Chan. "Gold Nanoparticles Bearing an α-Lipoic Acid-based Ligand Shell: Synthesis, Model Complexes and Studies Concerning Phosphorescent Platinum(II)-Functionalisation". Zeitschrift für Naturforschung B 65, n.º 9 (1 de septiembre de 2010): 1089–96. http://dx.doi.org/10.1515/znb-2010-0906.

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The surface functionalisation of gold nanoparticles (GNPs) with luminescent platinum complexes has been investigated, utilising α-lipoic acid derivatives for GNP stabilisation. Model complexes have been studied to mimic the chemisorption chemistry required to afford GNPs protected by an α-lipoic acid-based ligand shell with terminal functionalisation suitable for metal coordination, and the unambiguous binding of the cyclic disulfide moiety at a zero-valent precious metal core through oxidative addition has been confirmed by X-ray crystallography. Subsequently, gold nanoparticles bearing the α-lipoic acid-based ligand shell have been prepared and characterised, and a synthetic methodology for the immobilisation of PtII luminophores onto their surface has been established.
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35

Chang, Yu-Hsu, Hsiao-Wan Wang, Ching-Wen Chiu, Der-Sun Cheng, Ming-Yu Yen y Hsin-Tien Chiu. "Low-Temperature Synthesis of Transition Metal Nanoparticles from Metal Complexes and Organopolysilane Oligomers". Chemistry of Materials 14, n.º 10 (octubre de 2002): 4334–38. http://dx.doi.org/10.1021/cm020173i.

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36

Zezin, A. A., V. I. Feldman, N. A. Shmakova, S. P. Valueva, V. K. Ivanchenko y N. I. Nikanorova. "The peculiarities of formation of the metal nanoparticles in irradiated polymer metal complexes". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 265, n.º 1 (diciembre de 2007): 334–38. http://dx.doi.org/10.1016/j.nimb.2007.08.068.

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37

Shu, Jiangnan, Wei Wang y Hua Cui. "Direct electrochemiluminescence of gold nanoparticles bifunctionalized by luminol analogue–metal complexes in neutral and alkaline media". Chemical Communications 51, n.º 57 (2015): 11366–69. http://dx.doi.org/10.1039/c5cc03104d.

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38

Eskandari, Arvin, Janine N. Boodram, Paul B. Cressey, Chunxin Lu, Peter M. Bruno, Michael T. Hemann y Kogularamanan Suntharalingam. "The breast cancer stem cell potency of copper(ii) complexes bearing nonsteroidal anti-inflammatory drugs and their encapsulation using polymeric nanoparticles". Dalton Transactions 45, n.º 44 (2016): 17867–73. http://dx.doi.org/10.1039/c6dt03811e.

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39

Vieira, Daniele Frasson, Nicolas Henrique Furquim, Wander Gustavo Botero, Luciana Camargo De Oliveira y Danielle Goveia. "INFLUENCE OF THE DIAMETER OF NANOPARTICLES IN COMPLEXES METAL-AQUATIC HUMIC SUBSTANCES". Eclética Química Journal 43, n.º 1SI (28 de junio de 2018): 44. http://dx.doi.org/10.26850/1678-4618eqj.v43.1si.2018.p44-50.

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Nanoparticles are emerging as the object of research in all fields of chemistry, their special properties are matter for concern, because a considerable portion of these materials are eliminated in the environment. A key point of the discussion is how nanoparticles will interact with other components in natural waters. In this project, the main objective will be to study the interactions of nanoparticles with metallic ions in the presence of humic substances in environmental systems. It is intended to differentiate free and labile metal ions using nanoparticles and organic matter in the form of aquatic substances (extracted from samples collected on the coast of São Paulo). It is intended to simulate the environmental systems and to verify the competition between the complexants. The differentiation of the free and complexed ions will be done using an ultrafiltration system equipped with polyethersulfone membrane (1KDa) and determination of the metals by atomic absorption spectrometry with flame atomization and graphite furnace.
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40

Patil, Siddappa A., Shivaputra A. Patil y Renukadevi Patil. "Magnetic Nanoparticles Supported Carbene and Amine Based Metal Complexes in Catalysis". Journal of Nano Research 42 (julio de 2016): 112–35. http://dx.doi.org/10.4028/www.scientific.net/jnanor.42.112.

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Catalysis is one of the hottest research topics in chemistry. In recent years, metal complexes attracted great interest as catalysts towards various types of organic reactions. However, these catalysts, in most cases, suffer from the deficits during their recovery, recycling and the difficulty in separation of catalysts from the products. Therefore, the design and synthesis of recoverable and recyclable catalyst is very important aspect in catalysis. The aim of this review article is to highlight the speedy growth in the synthesis and catalytic applications of magnetic nanoparticles (Fe3O4, MNPs) supported N-heterocyclic carbene (NHC) and amine based metal complexes in various organic reactions. Furthermore, these catalysts can be easily separated from the reaction media with the external magnet and reused various times without a substantial loss of catalytic activity.
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41

Garden, J. A. y S. D. Pike. "Hydrolysis of organometallic and metal–amide precursors: synthesis routes to oxo-bridged heterometallic complexes, metal-oxo clusters and metal oxide nanoparticles". Dalton Transactions 47, n.º 11 (2018): 3638–62. http://dx.doi.org/10.1039/c8dt00017d.

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42

Menon, Samvit G., Khoobaram S. Choudhari, Srinivasrao A. Shivashankar, Santhosh Chidangil y Suresh D. Kulkarni. "Microwave solution route to ceramic ZnAl2O4 nanoparticles in 10 minutes: inversion and photophysical changes with thermal history". New Journal of Chemistry 41, n.º 13 (2017): 5420–28. http://dx.doi.org/10.1039/c7nj01006k.

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43

Ismayılova, G. H., Sh I. Gahramanova, I. V. Azizov y T. O. Gahramanov. "INFLUENCE OF IRON OXIDE NANOPARTICLES AND COMPLEXES OF BIOGENIC METALS WITH ORGANIC ACIDS ON PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF WHEAT SEEDLINGS". Azerbaijan Chemical Journal, n.º 4 (8 de diciembre de 2022): 53–59. http://dx.doi.org/10.32737/0005-2531-2022-4-53-59.

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In this study, complexes of manganese (II) and zinc(II) with ligands (salicylic acid and cysteine) [MnL2(H2O)2]2H2O, [ZnL2(H2O)2]2H2O have been synthesized. It is shown that the composition of the obtained complexes depends on the ratio of the initial components. The composition and structure of the complexes have been studied by elemental, X-ray phase analysis, (DLS)method, UV-VIS spectroscopy, IR spectral and thermogravimetric analysis. The method of UV spectroscopy has show that the ligands in the composition of the metal (II) complexes enter the neutral form and coordinate with the complexing agent through the nitrogen atom. According to UV spectroscopy has d-d transition was observed in the complexes corresponding to the wavelength for Mn (II) 480-560 nm, for Zn (II) complex 238 nm. The results of thermogravimetric studies have shown that the final product of the thermal decomposition of all compounds is metal oxide, respectively. The complex compounds of manganese and zinc with the amino acids cysteine, methionine, glycine and salicylic acid and nanoparticles of Fe2 O3 have a positive effect on seed germination, the synthesis of photosynthetic pigments and activity of ascorbate peroxidase in wheat leaves
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44

Abe, Satoshi, Basudev Maity y Takafumi Ueno. "Functionalization of protein crystals with metal ions, complexes and nanoparticles". Current Opinion in Chemical Biology 43 (abril de 2018): 68–76. http://dx.doi.org/10.1016/j.cbpa.2017.11.015.

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45

Alarcon-Correa, Mariana, Tung-Chun Lee y Peer Fischer. "ChemInform Abstract: Dynamic Inclusion Complexes of Metal Nanoparticles Inside Nanocups." ChemInform 46, n.º 32 (24 de julio de 2015): no. http://dx.doi.org/10.1002/chin.201532230.

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46

Kim, Sunghwan, Youngjin Jang, Ki Youl Yoon y Jongnam Park. "Surface engineered gold nanoparticles through highly stable metal–surfactant complexes". Journal of Colloid and Interface Science 464 (febrero de 2016): 110–16. http://dx.doi.org/10.1016/j.jcis.2015.10.034.

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47

Berkovich, Inbal, Sudheendran Mavila, Olga Iliashevsky, Sebastian Kozuch y N. Gabriel Lemcoff. "Single-chain polybutadiene organometallic nanoparticles: an experimental and theoretical study". Chemical Science 7, n.º 3 (2016): 1773–78. http://dx.doi.org/10.1039/c5sc04535e.

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High molecular weight polybutadienes and rhodium complexes were used to produce single chain organometallic nanoparticles. A relationship was found between the cis double bond content of the polymer and metal binding kinetics.
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48

van Leeuwen, Herman P., Jérôme F. L. Duval, José Paulo Pinheiro, Ronny Blust y Raewyn M. Town. "Chemodynamics and bioavailability of metal ion complexes with nanoparticles in aqueous media". Environmental Science: Nano 4, n.º 11 (2017): 2108–33. http://dx.doi.org/10.1039/c7en00625j.

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49

Turquet, François-Xavier, Montserrat Corbella, Clémentine Fellah, Gilles Montagnac, Bruno Reynard, Laurent Bonneviot, Kun Zhang y Belén Albela. "Incorporation of Manganese Complexes within Hybrid Resol-Silica and Carbon-Silica Nanoparticles". Nanomaterials 11, n.º 3 (18 de marzo de 2021): 774. http://dx.doi.org/10.3390/nano11030774.

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The incorporation of a luminescent probe into a nano-vector is one of the approaches used to design chemosensors and nanocargos for drug delivery and theranostics. The location of the nano-vector can be followed using fluorescence spectroscopy together with the change of environment that affects the fluorescence properties. The ligand 9-anthracene carboxylate is proposed in this study as a luminescent probe to locate two types of manganese complexes inside three series of porous nanoparticles of different composition: resol-silica, carbon-silica and pure silica. The manganese complexes are a tetranuclear MnIII cluster [MnIII4(μ-O)2(μ-AntCO2)6(bpy)2(ClO4)2] with a butterfly core, and a MnII dinuclear complex [{MnII(bpy)(AntCO2)}2(μ-AntCO2)2(μ-OH2)]. The magnetic measurements indicate that both complexes are present as dinuclear entities when incorporated inside the particles. Both the Mn complexes and the nanoparticles are luminescent. However, when the metal complexes are introduced into the nanoparticles, the luminescent properties of both are altered. The study of the fluorescence of the nanoparticles’ suspensions and of the supernatants shows that MnII compounds seem to be more retained inside the particles than MnIII compounds. The resol-silica nanoparticles with MnII complexes inside is the material that presents the lowest complex leaching in ethanol.
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50

Yue, Bin, Yuan Li, Kai Kong, Hai Bin Chu y Yong Liang Zhao. "Study on the Ag@SiO2 Enhanced the Luminous Intensity of the Terbium Complexes with Benzoic Acid and 1,10-phenanthroline". Applied Mechanics and Materials 472 (enero de 2014): 711–14. http://dx.doi.org/10.4028/www.scientific.net/amm.472.711.

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Five kinds of terbium complexes have been synthesized respectively with benzoic acid, 1,10-phenanthroline and 2,2'-bipyridine as ligands. The core-shell Ag@SiO2nanocomposites was prepared. The result of transmission electron microscopy (TEM) shows the diameter of the nanosilver is about 50 nm and the thickness of the silica shell is 10, 25 and 80 nm. Combine the nanoparticles composite with terbium complexes, we explore the changes of excitation wavelength and emission intensity. The results show that: by loading the terbium complexes above the different size of nanoparticles, the excitation wavelengths of complexes do not shift, and the emission intensity of the complexes are enhanced in the presence of Ag@SiO2nanoparticles because of metal-enhanced fluorescence (MEF), but at only a limited shell thickness particle region.
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