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Auteur : Grafiati
Publié le 10 mars 2023

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1

Zhou, Meng, Chenjie Zeng, Qi Li, Tatsuya Higaki et Rongchao Jin. « Gold Nanoclusters : Bridging Gold Complexes and Plasmonic Nanoparticles in Photophysical Properties ». Nanomaterials 9, no 7 (28 juin 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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Kaub, Christoph, Sergei Lebedkin, Sebastian Bestgen, Ralf Köppe, Manfred M. Kappes et Peter W. Roesky. « Defined tetranuclear coinage metal chains ». Chemical Communications 53, no 69 (2017) : 9578–81. http://dx.doi.org/10.1039/c7cc04705c.

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Heterodimetallic gold/copper and gold/silver complexes were synthesized, and feature an unprecedented V-shape or linear MAu2M (M = Cu, Ag) setup in the solid state. Photoluminescence properties of the complexes strongly depend on the metal.
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3

Michalak et Kośnik. « Chiral N-heterocyclic Carbene Gold Complexes : Synthesis and Applications in Catalysis ». Catalysts 9, no 11 (25 octobre 2019) : 890. http://dx.doi.org/10.3390/catal9110890.

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N-Heterocyclic carbenes have found many applications in modern metal catalysis, due to the formation of stable metal complexes, and organocatalysis. Among a myriad of N-heterocyclic carbene metal complexes, gold complexes have gained a lot of attention due to their unique propensity for the activation of carbon-carbon multiple bonds, allowing many useful transformations of alkynes, allenes, and alkenes, inaccessible by other metal complexes. The present review summarizes synthetic efforts towards the preparation of chiral N-heterocyclic gold(I) complexes exhibiting C2 and C1 symmetry, as well as their applications in enantioselective catalysis. Finally, the emerging area of rare gold(III) complexes and their preliminary usage in asymmetric catalysis is also presented.
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Dias, H. V. Rasika. « Polyfluorinated ligand-supported organometallic complexes of copper, silver, and gold ». Pure and Applied Chemistry 82, no 3 (14 février 2010) : 649–56. http://dx.doi.org/10.1351/pac-con-09-10-19.

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The tris(pyrazolyl)borate [HB(3,5-(CF3)2Pz)3]− prepared using highly fluorinated 3,5-bis(trifluoromethyl)pyrazole and BH4− is an excellent supporting ligand for the stabilization of a number of rare organometallic complexes of coinage metals. For example, it has enabled the isolation of Cu(I), Ag(I), and Au(I) complexes of CO and ethylene as crystalline solids. Syntheses, spectroscopic and structural features, and properties of [HB(3,5-(CF3)2Pz)3]ML (M = Cu, Ag, Au; L = CO, C2H4) are the main focus of this discussion. Several metal adducts based on the tris(triazolyl)borate [HB(3,5-(CF3)2Tz)3]− supporting ligand as well as the cationic, coinage metal multi-alkene complexes containing the [SbF6]− counterion are also discussed.
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5

Aguado, Javier E., M. Concepción Gimeno, Peter G. Jones et Antonio Laguna. « Unusual coordination behaviour of the ferrocenyl-terpyridine ligand with group 11 complexes ». Canadian Journal of Chemistry 87, no 1 (1 janvier 2009) : 341–47. http://dx.doi.org/10.1139/v08-148.

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Complexes of the ligand Fcterpy (Fcterpy = 4′-ferrocenyl-2,2′:6′,2′-terpyridine) with group 11 metals display different coordination modes. The reaction with complexes [Cu(NO3)(PPh3)2] or [M(OTf)(PR3)] (OTf = trifluoromethyl sulphonate) gives the species [M(Fcterpy)(PR3)]X (M = Cu, X = PF6, PR3 = PPh3 (1); M = Ag, X = OTf, PR3 = PPh3 (2), PPh2Me (3); M = Au, X = OTf, PR3 = PPh3 (4)) in which the ligand is coordinated as a tridentate chelate to the metal. Treatment with [Cu(NCMe)4]PF6 or Ag(OTf) in 1:1 molar ratio gives the dinuclear complexes [M2(Fcterpy)2]X2 (M = Cu (5), Ag (6)), in which the ligand is tetradentate because the central pyridine group is bonded to two metals. The reaction with the gold(I) complex [Au(C6F5)(tht)] (tht = tetrahydrothiophene) leads to the first example of a terpyridine ligand bonded to three metal atoms, [Au3(C6F5)3(Fcterpy)] (7); in the product of the corresponding reaction with the gold(III) derivative [Au(C6F5)3(OEt2)] to give [Au(C6F5)3(Fcterpy)] (8), the ligand is monodentate, which is also unusual for a terpyridine ligand.Key words: copper, silver, gold, terpyridine, ferrocene derivatives
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Braunstein, Pierre, Michael Knorr, Antonio Tiripicchio et Marisa Tiripicchio Camellini. « Competing metal-metal bonding in heterometallic complexes of gold and mercury. Synthesis of contrasting iron-gold-gold-iron and iron-mercury-iron complexes ». Inorganic Chemistry 31, no 18 (septembre 1992) : 3685–87. http://dx.doi.org/10.1021/ic00044a002.

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Andrejević, Tina P., Biljana Đ. Glišić et Miloš I. Djuran. « Amino Acids and Peptides as Versatile Ligands in the Synthesis of Antiproliferative Gold Complexes ». Chemistry 2, no 2 (27 mars 2020) : 203–18. http://dx.doi.org/10.3390/chemistry2020013.

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Gold complexes have been traditionally employed in medicine, and currently, some gold(I) complexes, such as auranofin, are clinically used in the treatment of rheumatoid arthritis. In the last decades, both gold(I) and gold(III) complexes with different types of ligands have gained considerable attention as potential antitumor agents, showing superior activity both in vitro and in vivo to some of the clinically used agents. The present review article summarizes the results achieved in the field of synthesis and evaluation of gold complexes with amino acids and peptides moieties for their cytotoxicity. The first section provides an overview of the gold(I) complexes with amino acids and peptides, which have shown antiproliferative activity, while the second part is focused on the activity of gold(III) complexes with these ligands. A systematic summary of the results achieved in the field of gold(I/III) complexes with amino acids and peptides could contribute to the future development of metal complexes with these biocompatible ligands as promising antitumor agents.
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Bojan, Vilma R., José M. López-de-Luzuriaga, Elena Manso, Miguel Monge et M. Elena Olmos. « Metal-Induced Phosphorescence in (Pentafluorophenyl)gold(III) Complexes ». Organometallics 30, no 17 (12 septembre 2011) : 4486–89. http://dx.doi.org/10.1021/om200537w.

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9

Dahlen, Milena, Tim P. Seifert, Sergei Lebedkin, Michael T. Gamer, Manfred M. Kappes et Peter W. Roesky. « Tetra- and hexanuclear string complexes of the coinage metals ». Chemical Communications 57, no 97 (2021) : 13146–49. http://dx.doi.org/10.1039/d1cc06034a.

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10

Johnson, Alice, Isabel Marzo et M. Concepción Gimeno. « Heterobimetallic propargyl gold complexes with π-bound copper or silver with enhanced anticancer activity ». Dalton Transactions 49, no 33 (2020) : 11736–42. http://dx.doi.org/10.1039/d0dt02113j.

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Heterometallic propargyl gold species in which copper or silver is bound to the triple bond were prepared. The bimetallic complexes had improved activities compared to the mononuclear gold complexes, suggesting a possible synergy between the two metal centres within the cell.
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Prasad, Sahdeo, Dan DuBourdieu, Ajay Srivastava, Prafulla Kumar et Rajiv Lall. « Metal–Curcumin Complexes in Therapeutics : An Approach to Enhance Pharmacological Effects of Curcumin ». International Journal of Molecular Sciences 22, no 13 (30 juin 2021) : 7094. http://dx.doi.org/10.3390/ijms22137094.

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Curcumin, an active component of the rhizome turmeric, has gained much attention as a plant-based compound with pleiotropic pharmacological properties. It possesses anti-inflammatory, antioxidant, hypoglycemic, antimicrobial, neuroprotective, and immunomodulatory activities. However, the health-promoting utility of curcumin is constrained due to its hydrophobic nature, water insolubility, poor bioavailability, rapid metabolism, and systemic elimination. Therefore, an innovative stride was taken, and complexes of metals with curcumin have been synthesized. Curcumin usually reacts with metals through the β-diketone moiety to generate metal–curcumin complexes. It is well established that curcumin strongly chelates several metal ions, including boron, cobalt, copper, gallium, gadolinium, gold, lanthanum, manganese, nickel, iron, palladium, platinum, ruthenium, silver, vanadium, and zinc. In this review, the pharmacological, chemopreventive, and therapeutic activities of metal–curcumin complexes are discussed. Metal–curcumin complexes increase the solubility, cellular uptake, and bioavailability and improve the antioxidant, anti-inflammatory, antimicrobial, and antiviral effects of curcumin. Metal–curcumin complexes have also demonstrated efficacy against various chronic diseases, including cancer, arthritis, osteoporosis, and neurological disorders such as Alzheimer’s disease. These biological activities of metal–curcumin complexes were associated with the modulation of inflammatory mediators, transcription factors, protein kinases, antiapoptotic proteins, lipid peroxidation, and antioxidant enzymes. In addition, metal–curcumin complexes have shown usefulness in biological imaging and radioimaging. The future use of metal–curcumin complexes may represent a new approach in the prevention and treatment of chronic diseases.
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Houbrechts, Stephan, Carlo Boutton, Koen Clays, André Persoons, Ian R. Whittall, Raina H. Naulty, Marie P. Cifuentes et Mark G. Humphrey. « Novel Organometallic Compounds for Nonlinear Optics ». Journal of Nonlinear Optical Physics & ; Materials 07, no 01 (mars 1998) : 113–20. http://dx.doi.org/10.1142/s0218863598000090.

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Hyper-Rayleigh scattering is used to investigate the nonlinear optical properties of novel metal (ruthenium, nickel and gold) σ-arylacetylide complexes. The influence of the organometallic donor group and conjugating bridge on the quadratic hyperpolarizability is studied. For all organic ligands, the addition of the metal (donor) group is shown to increase the static hyperpolarizability by a factor of 2, 4 and 7 for gold, nickel and ruthenium complexes, respectively. Moreover, replacement of phenyl with a heterocyclic ring is demonstrated to enlarge the hyperpolarizability in the case of gold and ruthenium compounds.
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13

Lima, João, et Laura Rodríguez. « Highlights on Gold TADF Complexes ». Inorganics 7, no 10 (11 octobre 2019) : 124. http://dx.doi.org/10.3390/inorganics7100124.

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Thermally activated delayed fluorescence (TADF) and TADF-organic light-emitting diodes (OLEDs) systems are being given increasing attention in research nowadays. Much more work has been done for organic-based materials in this field, but the use of TADF organometallic systems has also emerged in recent years. In particular, TADF-based gold compounds have not been particularly well-explored, with a higher number of examples of Au(I)-molecules and fewer for the higher oxidation state Au(III) derivatives. Nevertheless, the novelty and observed results deserve attention. A careful analysis has been performed in this review by classifying the reported compounds into two different groups regarding the oxidation state of the metal, and within each group, the ancillary ligands. Specific examples to illustrate their potential applications are included in the different sections.
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14

Jahnke, Mareike C., et F. Ekkehardt Hahn. « Synthesis and coordination chemistry of silver(I), gold(I) and gold(III) complexes with picoline-functionalized benzimidazolin-2-ylidene ligands ». Zeitschrift für Naturforschung B 76, no 8 (22 juillet 2021) : 463–73. http://dx.doi.org/10.1515/znb-2021-0087.

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Abstract The reactions of N-alkyl-N′-picolyl-benzimidazolium bromides or N,N′-dipicolyl-benzimidazolium bromide with silver oxide yielded the silver dicarbene complexes of the type [Ag(NHC)2][AgBr2] 1–4 (NHC = picoline-functionalized benzimidazolin-2-ylidene). The silver complexes 1–4 have been used in carbene transfer reactions to yield the gold(I) complexes of the type [AuCl(NHC)] 5–8 in good yields. A halide exchange at the metal center of complexes 5–8 with lithium bromide yielded the gold bromide complexes 9–12. Finally, the oxidation of the gold(I) centers in complexes 9–12 with elemental bromine gave the gold(III) complexes of the type [AuBr3(NHC)] 13–16. Molecular structures of selected Au(I) and Au(III) complexes have been determined by X-ray diffraction studies.
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15

Foley, Janet B., Stanley E. Gay, Christopher Turmel, Gang Wei, Tong Jiang, Ratnavathany Narayanaswamy, Bruce M. Foxman, Michael J. Vela, Alice E. Bruce et Mitchell R. M. Bruce. « Electronic Structure of Dinuclear Gold(I) Complexes ». Metal-Based Drugs 6, no 4-5 (1 janvier 1999) : 255–60. http://dx.doi.org/10.1155/mbd.1999.255.

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Cyclic voltammetry (CV) experiments on LL(AuSR∗)2 complexes [LL = diphenylphosphinomethane (dppm), diphenylphosphinopentane (dpppn); R* = p-SC6H4CH3] show anodic sweeps that broaden by about 25 mV on going from the longer (dpppn) to the shorter (dppm) bidentate phosphine ligand. Changing concentrations had no effect on the shape of the waveform. The result suggests a weak intramolecular metal-metal interaction in dppm(AuSR∗)2 that correlates well with rate acceleration occurring in the reaction of dppm(AuSR∗)2 with organic disulfides. Quantum yields for cis-dppee(AuX)2 [dppee = 1,2-bis(diphenylphosphino)ethylene; X = Cl, Br, I] complexes, (disappearance)Φ, are significantly higher in complexes with a softer X ligand, a trend that correlates well with aurophilicity. This result also suggests that electronic perturbation caused by Au(I)-Au(I) interactions is important in explaining the reactivity of some dinuclear gold(I) complexes. The crystal structure for cis-dppee(Aul)2 shows short intramolecular Au(I)-Au(I) interactions of 2.9526 (6) A°, while the structure of trans-dppee(AuI)2 , shows intermolecular Au(I)-Au(I) interactions of 3.2292 (9) A°. The substitution of .As for P results in a ligand, cis-diphenylarsinoethylene (cis-dpaee), that is photochemically active, in contrast to the cis-dppee ligand. The complexes, cis-dpaee(AuX)2, are also photochemically active but with lower quantum yields than the cis-dppee(AuX)2 complexes.
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Hirschbiegel, Cristina-Maria, Stefano Fedeli, Xianzhi Zhang, Rui Huang, Jungmi Park, Yisheng Xu et Vincent M. Rotello. « Enhanced Design of Gold Catalysts for Bioorthogonal Polyzymes ». Materials 15, no 18 (19 septembre 2022) : 6487. http://dx.doi.org/10.3390/ma15186487.

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Bioorthogonal chemistry introduces nonbiogenic reactions that can be performed in biological systems, allowing for the localized release of therapeutic agents. Bioorthogonal catalysts can amplify uncaging reactions for the in situ generation of therapeutics. Embedding these catalysts into a polymeric nanoscaffold can protect and modulate the catalytic activity, improving the performance of the resulting bioorthogonal “polyzymes”. Catalysts based on nontoxic metals such as gold(I) are particularly attractive for therapeutic applications. Herein, we optimized the structural components of a metal catalyst to develop an efficient gold(I)-based polyzyme. Tailoring the ligand structure of gold phosphine-based complexes, we improved the affinity between the metal complex and polymer scaffold, resulting in enhanced encapsulation efficiency and catalytic rate of the polyzyme. Our findings show the dependence of the overall polyzyme properties on the structural properties of the encapsulated metal complex.
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Mohamed, Ahmed A., Alfredo Burini et John P. Fackler. « Mixed-Metal Triangular Trinuclear Complexes : Dimers of Gold−Silver Mixed-Metal Complexes from Gold(I) Carbeniates and Silver(I) 3,5-Diphenylpyrazolates ». Journal of the American Chemical Society 127, no 14 (avril 2005) : 5012–13. http://dx.doi.org/10.1021/ja0429869.

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Fackler, John P., Zerihun Assefa, Jennifer M. Forward et Richard J. Staples. « Excited States of Gold(I) Compounds, Luminescence and Gold-Gold Bonding ». Metal-Based Drugs 1, no 5-6 (1 janvier 1994) : 459–66. http://dx.doi.org/10.1155/mbd.1994.459.

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It has long been established by Khan that the superoxide anion, O2-, generates singlet oxygen, O21Δg, during dismutation. Auranofin, gold-phosphine thiols, β-Carotene, and metal-sulfur compounds can rapidly quench singlet O2. The quenching of the O21Δg, which exists at 7752 cm-1 above the ground state triplet, may be due to the direct interaction of the singlet O2 with gold(I) or may require special ligands such as those containing sulfur coordinated to the metal. Thus we have been examining the excited state behavior of gold(I) species and the mechanisms for luminescence. Luminescence is observed under various conditions, with visible emission ranging from blue to red depending on the ligands coordinated to gold(I). Triplet state emission can be found from mononuclear three coordinate Au(I) species, including species which display this behavior in aqueous solution. A description is given of the luminescent three coordinate TPA (triazaphosphaadamantane) and TPPTS (triphenylphosphine-trisulfonate) complexes, the first examples of water soluble luminescent species of gold(I).
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Machado, João Franco, João D. G. Correia et Tânia S. Morais. « Emerging Molecular Receptors for the Specific-Target Delivery of Ruthenium and Gold Complexes into Cancer Cells ». Molecules 26, no 11 (25 mai 2021) : 3153. http://dx.doi.org/10.3390/molecules26113153.

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Cisplatin and derivatives are highly effective in the treatment of a wide range of cancer types; however, these metallodrugs display low selectivity, leading to severe side effects. Additionally, their administration often results in the development of chemoresistance, which ultimately results in therapeutic failure. This scenario triggered the study of other transition metals with innovative pharmacological profiles as alternatives to platinum, ruthenium- (e.g., KP1339 and NAMI-A) and gold-based (e.g., Auranofin) complexes being among the most advanced in terms of clinical evaluation. Concerning the importance of improving the in vivo selectivity of metal complexes and the current relevance of ruthenium and gold metals, this review article aims to survey the main research efforts made in the past few years toward the design and biological evaluation of target-specific ruthenium and gold complexes. Herein, we give an overview of the inorganic and organometallic molecules conjugated to different biomolecules for targeting membrane proteins, namely cell adhesion molecules, G-protein coupled receptors, and growth factor receptors. Complexes that recognize the progesterone receptors or other targets involved in metabolic pathways such as glucose transporters are discussed as well. Finally, we describe some complexes aimed at recognizing cell organelles or compartments, mitochondria being the most explored. The few complexes addressing targeted gene therapy are also presented and discussed.
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Benazic, Sasa, Zana Besser Silconi, Jelena Milovanovic, Aleksandar Arsenijevic, Bojana Stojanovic, Marija Milovanovic et Tatjana Kanjevac. « Zinc and Gold Complexes in the Treatment of Breast Cancer / Kompleksi Cinka I Zlata U Lecenju Karcinoma Dojke ». Serbian Journal of Experimental and Clinical Research 17, no 1 (1 mars 2016) : 55–60. http://dx.doi.org/10.1515/sjecr-2015-0044.

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AbstractMetals are essential components in indispensable biochemical processes for living organisms. This review article highlights the metals zinc and gold in the development and treatment of breast cancer. Metal compounds off er many advantages as therapeutics due to their ability to coordinate ligands in a three-dimensional configuration. In aqueous solution, they form positively charged ions that can bind to negatively charged biological molecules. Metal complexes that contain metal ions such as zinc(II) and gold have received considerable attention as potential anticancer agents. Zinc is an essential trace element that plays a critical role in a wide range of cellular processes that include structural, signalling, catalytic and regulatory functions. Zinc acts as a key structural component in many proteins and enzymes, including transcription factors, cellular signalling proteins, and DNA repair enzymes, and perturbed levels of zinc in tissues may play a role in cancer aetiology and outcome. Unlike zinc, gold is feasible as a component of compounds for effective anticancer therapy. Some progress in anticancer therapy may include interactions between zinc and gold.
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Zhang, Ming, Camille Saint-Germain, Guiling He et Raymond Wai-Yin Sun. « Drug Delivery Systems For Anti-Cancer Active Complexes of Some Coinage Metals ». Current Medicinal Chemistry 25, no 4 (12 février 2018) : 493–505. http://dx.doi.org/10.2174/0929867324666170511152441.

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Background: Although cisplatin and a number of platinum complexes have widely been used for the treatment of neoplasia, patients receiving these treatments have frequently suffered from their severe toxic side effects, the development of resistance with consequent relapse. In the recent decades, numerous complexes of coinage metals including that of gold, copper and silver have been reported to display promising in vitro and/or in vivo anti-cancer activities as well as potent activities towards cisplatin-resistant tumors. Nevertheless, the medical development of these metal complexes has been hampered by their instability in aqueous solutions and the nonspecific binding in biological systems. Methods: One of the approaches to overcome these problems is to design and develop adequate drug delivery systems (DDSs) for the transport of these complexes. By functionalization, encapsulation or formulation of the metal complexes, several types of DDSs have been reported to improve the desired pharmacological profile of the metal complexes, improving their overall stability, bioavailability, anti-cancer activity and reducing their toxicity towards normal cells. Conclusion: In this review, we summarized the recent findings for different DDSs for various anti- cancer active complexes of some coinage metals.
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Canudo-Barreras, Guillermo, Lourdes Ortego, Anabel Izaga, Isabel Marzo, Raquel P. Herrera et M. Concepción Gimeno. « Synthesis of New Thiourea-Metal Complexes with Promising Anticancer Properties ». Molecules 26, no 22 (16 novembre 2021) : 6891. http://dx.doi.org/10.3390/molecules26226891.

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In this work, two thiourea ligands bearing a phosphine group in one arm and in the other a phenyl group (T2) or 3,5-di-CF3 substituted phenyl ring (T1) have been prepared and their coordination to Au and Ag has been studied. A different behavior is observed for gold complexes, a linear geometry with coordination only to the phosphorus atom or an equilibrium between the linear and three-coordinated species is present, whereas for silver complexes the coordination of the ligand as P^S chelate is found. The thiourea ligands and their complexes were explored against different cancer cell lines (HeLa, A549, and Jurkat). The thiourea ligands do not exhibit relevant cytotoxicity in the tested cell lines and the coordination of a metal triggers excellent cytotoxic values in all cases. In general, data showed that gold complexes are more cytotoxic than the silver compounds with T1, in particular the complexes [AuT1(PPh3)]OTf, the bis(thiourea) [Au(T1)2]OTf and the gold-thiolate species [Au(SR)T1]. In contrast, with T2 better results are obtained with silver species [AgT1(PPh3)]OTf and the [Ag(T1)2]OTf. The role played by the ancillary ligand bound to the metal is important since it strongly affects the cytotoxic activity, being the bis(thiourea) complex the most active species. This study demonstrates that metal complexes derived from thiourea can be biologically active and these compounds are promising leads for further development as potential anticancer agents.
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Yang, Yi, Visalakshi Ramamoorthy et Paul R. Sharp. « Late transition metal oxo and imido complexes. 11. Gold(I) oxo complexes ». Inorganic Chemistry 32, no 10 (mai 1993) : 1946–50. http://dx.doi.org/10.1021/ic00062a012.

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Kiefer, Claude, Sebastian Bestgen, Michael T. Gamer, Sergei Lebedkin, Manfred M. Kappes et Peter W. Roesky. « Correction : Alkynyl-functionalized gold NHC complexes and their coinage metal clusters ». Dalton Transactions 45, no 7 (2016) : 3182. http://dx.doi.org/10.1039/c6dt90020h.

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Wilton-Ely, James D. E. T. « The surface functionalisation of gold nanoparticles with metal complexes ». Dalton Trans., no 1 (2008) : 25–29. http://dx.doi.org/10.1039/b714144k.

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Pettibone, John M., et Jeffrey W. Hudgens. « Predictive Gold Nanocluster Formation Controlled by Metal-Ligand Complexes ». Small 8, no 5 (9 janvier 2012) : 715–25. http://dx.doi.org/10.1002/smll.201101777.

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Chan, Kaai Tung, Glenna So Ming Tong, Wai-Pong To, Chen Yang, Lili Du, David Lee Phillips et Chi-Ming Che. « The interplay between fluorescence and phosphorescence with luminescent gold(i) and gold(iii) complexes bearing heterocyclic arylacetylide ligands ». Chemical Science 8, no 3 (2017) : 2352–64. http://dx.doi.org/10.1039/c6sc03775e.

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Eilrich, Volker Jens, Toni Grell, Peter Lönnecke, Chen Song, Jörg Matysik et Evamarie Hey-Hawkins. « Gold(i) complexes of tetra-tert-butylcyclotetraphosphane ». Dalton Transactions 51, no 12 (2022) : 4627–33. http://dx.doi.org/10.1039/d2dt00202g.

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1,2,3,4-Tetra-tert-butylcyclotetraphosphane can coordinate up to four {AuCl} fragments. The complexes with 1 to 3 {AuCl} fragments exhibit dynamic behaviour with redistribution of the metal complex fragments.
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Beillard, Audrey, Xavier Bantreil, Thomas-Xavier Métro, Jean Martinez et Frédéric Lamaty. « Mechanochemistry for facilitated access to N,N-diaryl NHC metal complexes ». New Journal of Chemistry 41, no 3 (2017) : 1057–63. http://dx.doi.org/10.1039/c6nj02895k.

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Armstrong, David, Fioralba Taullaj, Kamalpreet Singh, Bijan Mirabi, Alan J. Lough et Ulrich Fekl. « Adamantyl metal complexes : new routes to adamantyl anions and new transmetallations ». Dalton Transactions 46, no 19 (2017) : 6212–17. http://dx.doi.org/10.1039/c7dt00428a.

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PIANA, H., H. WAGNER et U. SCHUBERT. « ChemInform Abstract : Transition-Metal Silyl Complexes. Part 36. Gold-Gold Interactions in Ph2P(CH2)1(2)PPh2-Bridged Dinuclear Gold Silyl Complexes. » ChemInform 22, no 14 (23 août 2010) : no. http://dx.doi.org/10.1002/chin.199114243.

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Fernández, Eduardo J., Antonio Laguna, José M. López-de-Luzuriaga, Manuel Montiel, M. Elena Olmos et Javier Pérez. « Dimethylsulfoxide gold–thallium complexes. Effects of the metal–metal interactions in the luminescence ». Inorganica Chimica Acta 358, no 14 (novembre 2005) : 4293–300. http://dx.doi.org/10.1016/j.ica.2005.03.024.

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Teets, Thomas S., Daniel A. Lutterman et Daniel G. Nocera. « Halogen Photoreductive Elimination from Metal−Metal Bonded Iridium(II)−Gold(II) Heterobimetallic Complexes ». Inorganic Chemistry 49, no 6 (15 mars 2010) : 3035–43. http://dx.doi.org/10.1021/ic902590u.

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Siemeling, Ulrich, Frauke Bretthauer, Clemens Bruhn, Tim-Patrick Fellinger, Wah-Leung Tong et 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, no 9 (1 septembre 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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Nahra, Fady, Kristof Van Hecke, Alan R. Kennedy et David J. Nelson. « Coinage metal complexes of selenoureas derived from N-heterocyclic carbenes ». Dalton Transactions 47, no 31 (2018) : 10671–84. http://dx.doi.org/10.1039/c8dt01506f.

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Usui, Yoko, Masafumi Hirano, Atsushi Fukuoka et Sanshiro Komiya. « Hydrogen Abstraction from Transition Metal Hydrides by Gold Alkoxides Giving Gold-Containing Heterodinuclear Complexes ». Chemistry Letters 26, no 10 (octobre 1997) : 981–82. http://dx.doi.org/10.1246/cl.1997.981.

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Scrimin, Paolo, et Yanchao Lyu. « Phosphate Triesters Cleavage by Gold Nanozymes ». Materials Proceedings 4, no 1 (15 novembre 2020) : 62. http://dx.doi.org/10.3390/iocn2020-07885.

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Phosphate triesters are cleaved by gold nanoparticles functionalized with metal complexes (Zn(II), Cu(II), Co(II), Co(III), Eu(III), Yt(III), Zr(IV)) of triazacyclonononane and cyclen ligands with a mononuclear mechanism with impressive rate accelerations with respect to the uncatalyzed processes, constituting a remarkable example of nerve agents hydrolyzing nanoazymes.
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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 et Andrey L. Rogach. « Carbon Dot Emission Enhancement in Covalent Complexes with Plasmonic Metal Nanoparticles ». Nanomaterials 13, no 2 (4 janvier 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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Iacopetta, Domenico, Jessica Ceramella, Camillo Rosano, Annaluisa Mariconda, Michele Pellegrino, Marco Sirignano, Carmela Saturnino et al. « N-Heterocyclic Carbene-Gold(I) Complexes Targeting Actin Polymerization ». Applied Sciences 11, no 12 (18 juin 2021) : 5626. http://dx.doi.org/10.3390/app11125626.

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Transition metal complexes are attracting attention because of their various chemical and biological properties. In particular, the NHC-gold complexes represent a productive field of research in medicinal chemistry, mostly as anticancer tools, displaying a broad range of targets. In addition to the already known biological targets, recently, an important activity in the organization of the cell cytoskeleton was discovered. In this paper, we demonstrated that two NHC-gold complexes (namely AuL4 and AuL7) possessing good anticancer activity and multi-target properties, as stated in our previous studies, play a major role in regulating the actin polymerization, by the means of in silico and in vitro assays. Using immunofluorescence and direct enzymatic assays, we proved that both the complexes inhibited the actin polymerization reaction without promoting the depolymerization of actin filaments. Our outcomes may contribute toward deepening the knowledge of NHC-gold complexes, with the objective of producing more effective and safer drugs for treating cancer diseases.
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Kiefer, Claude, Sebastian Bestgen, Michael T. Gamer, Sergei Lebedkin, Manfred M. Kappes et Peter W. Roesky. « Alkynyl-functionalized gold NHC complexes and their coinage metal clusters ». Dalton Transactions 44, no 30 (2015) : 13662–70. http://dx.doi.org/10.1039/c5dt02228b.

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Phenylpropynyl-functionalized N-heterocyclic carbenes as ligands for the synthesis of heterometallic hexanuclear coinagemetal clusters which exhibit mixed metallophillic interactions and intense white photoluminescence at low temperature.
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Kim, Sunghwan, Youngjin Jang, Ki Youl Yoon et Jongnam Park. « Surface engineered gold nanoparticles through highly stable metal–surfactant complexes ». Journal of Colloid and Interface Science 464 (février 2016) : 110–16. http://dx.doi.org/10.1016/j.jcis.2015.10.034.

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Shu, Jiangnan, Wei Wang et Hua Cui. « Direct electrochemiluminescence of gold nanoparticles bifunctionalized by luminol analogue–metal complexes in neutral and alkaline media ». Chemical Communications 51, no 57 (2015) : 11366–69. http://dx.doi.org/10.1039/c5cc03104d.

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Yam, Vivian Wing-Wah. « Photofunctional organometallics—from fundamentals to design, assembly and functions ». Pure and Applied Chemistry 85, no 7 (26 juin 2013) : 1321–29. http://dx.doi.org/10.1351/pac-con-12-11-19.

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A number of soluble platinum(II) and gold(I) complexes have been designed and synthesized. Their luminescence and photophysical behavior have been studied. Their assembly properties, which were governed by the noncovalent metal–metal interactions, have also been investigated with the introduction of various external stimuli. The UV–vis and emission spectral changes of these complexes, which arose from the modulation of their assembly and disassembly behavior, have demonstrated the establishment of a convenient and sensitive detection strategy for various types of analytes. These studies suggested the potential applications of these metal complexes as detection probes for a diverse range of target substrates.
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Shang, Rong, Souta Saito, J. Oscar C. Jimenez-Halla et Yohsuke Yamamoto. « Facile reactions of gold(i) complexes with tri(tert-butyl)azadiboriridine ». Dalton Transactions 47, no 15 (2018) : 5181–88. http://dx.doi.org/10.1039/c8dt00697k.

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Maliszewska, Hanna K., David L. Hughes et María Paz Muñoz. « Allene-derived gold and platinum complexes : synthesis and first applications in catalysis ». Dalton Transactions 49, no 13 (2020) : 4034–38. http://dx.doi.org/10.1039/d0dt00665c.

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de Mendoza, Paula, et Antonio M. Echavarren. « Synthesis of arenes and heteroarenes by hydroarylation reactions catalyzed by electrophilic metal complexes ». Pure and Applied Chemistry 82, no 4 (10 mars 2010) : 801–20. http://dx.doi.org/10.1351/pac-con-09-10-06.

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The hydroarylation of alkynes (also known as arylation of alkynes or alkenylation of arenes) catalyzed by gold or other electrophilic metal salts or complexes is reviewed from synthetic and mechanistic perspectives.
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47

Melot, Romain, et Véronique Michelet. « Coinage Metal-Catalyzed Asymmetric Reactions of ortho-Alkynylaryl and Heteroaryl Aldehydes and Ketones ». Molecules 27, no 20 (17 octobre 2022) : 6970. http://dx.doi.org/10.3390/molecules27206970.

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Coinage metals have become the metal of choice due to their excellent catalytic activity in organic transformation processes. Combining various chiral ligands and coinage metals became a productive area of research and access to heterocyclic derivatives according to an efficient and sustainable manner. This review was devoted to the various recently developed coinage metal-catalyzed domino processes of ortho-alkynylaryl and heteroaryl aldehydes and ketones leading to functionalized heterocycles. Various gold chiral complexes were presented, and methods of preparations of chromenes along with indoles were covered. Ag-chiral complexes are also prone to interesting activities such as cyclization followed by reduction and functionalization with enolizable ketones or (diazomethyl)phosphonate. Asymmetric Cu-catalyzed domino cyclization and asymmetric transfer hydrogenation reactions efficiently led to functionalized chromenes. Some remarkable examples involving copper associated with ruthenium in the context of a cyclization and asymmetric hydrogenation process were also presented.
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48

Bennett, Martin A., Nedaossadat Mirzadeh, Steven H. Privér, Jörg Wagler et Suresh K. Bhargava. « Trinuclear Mixed-valent Gold Complexes Derived from 2-C6F4PPh2 : Phosphine Oxide Complexes of Gold(III) and an ortho-Metallated Complex of Gold(I) ». Zeitschrift für Naturforschung B 64, no 11-12 (1 décembre 2009) : 1463–68. http://dx.doi.org/10.1515/znb-2009-11-1229.

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Crystals of two mixed-valent gold complexes [(O2NO)AuI(μ-2-C6F4PPh2)AuIII{κ2-2-C6- F4P(O)Ph2}(μ-2-C6F4PPh2)AuI(ONO2)] (14) and [(O2NO)AuI(μ-2-C6F4PPh2)AuIII{κ3-2-C6F4- P(O)Ph(C6H4)}(μ-2-C6F4PPh2)AuI] (15) have been obtained from the reaction of the digold(I,III) complex [ClAuI(μ-2-C6F4PPh2)(κ2-2-C6F4PPh2)AuIIICl] (5) with, respectively, a small and a large excess of silver nitrate. Both complexes contain three, approximately collinear metal atoms, the central gold(III) atom being planar-coordinated by a chelate (O,C)-phosphine oxide formed by oxidation of 2-C6F4PPh2 and the carbon atoms of two bridging 2-C6F4PPh2 groups. In 14 each of the terminal gold(I) atoms is coordinated by a monodentate nitrate ion and the phosphorus atom of μ-2-C6F4PPh2, whereas in 15 the nitrate ion on one of the gold(I) atoms of 14 has been replaced by the carbon atom of a bridging C6H4 group derived by Ag+-promoted cyclometallation of a phenyl group on the neighbouring phosphine oxide
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Crochet, Pascale, et Victorio Cadierno. « Gold Complexes with Hydrophilic N-Heterocyclic Carbene Ligands and Their Contribution to Aqueous-Phase Catalysis ». Catalysts 13, no 2 (17 février 2023) : 436. http://dx.doi.org/10.3390/catal13020436.

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N-Heterocyclic carbenes (NHCs) are nowadays one of the most widely employed ligands in organometallic chemistry and homogeneous catalysis due to the inherent stability of the metal-carbene bond and the ease of modification of the backbone as well as the N-wingtips substituents of these ligands. The functionalization of NHCs with hydrophilic groups offers the possibility of using NHC-metal complexes in aqueous catalysis, a hot topic within the Green Chemistry context due to the positive implications associated with the use of water as a reaction medium. In line with the enormous interest aroused by gold complexes in catalysis, significant efforts have been directed in the last years to the design and application of hydrophilic NHC-gold catalysts. This review is aimed to summarize the research in this area. The catalytic applications of water-soluble gold nanoparticles stabilized by hydrophilic NHCs are also covered.
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Liang, Chang Jin, Jing Ying Li et Chuan Jing Ma. « Review on Cyanogenic Bacteria for Gold Recovery from E-Waste ». Advanced Materials Research 878 (janvier 2014) : 355–67. http://dx.doi.org/10.4028/www.scientific.net/amr.878.355.

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Electronic waste (E-waste) is recognized as a new emerging and fast-growing waste stream, and may be considered as a secondary ore for the recovery of some precious metals (such as gold). A number of control technologies have been conducted for gold recovery, and in which, cyanidation is widely used. In recent years, an alternate approach to the gold cyanidation process is being considered, in which the aim is to replace with the microorganism, specifically cyanogenic bacteria such asChromobacterium violaceum,Pseudomonas fluorescens,Pseudomonas aeruginosaandEscherichia coli.All these species can produce cyanide ions and dissolve gold in their metabolic processes. The mechanism is a combination of chemical knowledge (interaction of metals and cyanide) with microbiological principles (biological cyanide formation) regarding metal solubilization from waste printed circuit boards and the formation of water-soluble cyanide complexes. And the activity of cyanogenic bacteria is affected by many factors, such as pH, dissolved oxygen pulp density and nutriment, especially several metal ions, which can serve as the catalyst in the metabolism. Now researchers are devoting themselves to looking for the proper conditions, not only from the bacteria themselves, but also the combination of many methods, which can reinforce the cyanide generation and improve gold leaching efficiency. At present the reported leaching efficiency of gold with cyanogenic is approximately 70%. As the continuous optimization of conditions, the industrial application can be expected soon.
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