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Littérature scientifique sur le sujet « Organic metal complexes »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Organic metal complexes"

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Nabeshima, Tatsuya, Yusuke Chiba, Takashi Nakamura et Ryota Matsuoka. « Synthesis and Functions of Oligomeric and Multidentate Dipyrrin Derivatives and their Complexes ». Synlett 31, no 17 (24 juillet 2020) : 1663–80. http://dx.doi.org/10.1055/s-0040-1707155.

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The dipyrrin–metal complexes and especially the boron complex 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) have recently attracted considerable attention because of their interesting properties and possible applications. We have developed two unique and useful ways to extend versatility and usefulness of the dipyrrin complexes. The first one is the linear and macrocyclic oligomerization of the BODIPY units. These arrangements of the B–F moieties of the oligomerized BODIPY units provide sophisticated functions, such as unique recognition ability toward cationic guest, associated with changes in the photophysical properties by utilizing unprecedented interactions between the B–F and a cationic species. The second one is introduction of additional ligating moieties into the dipyrrin skeleton. The multidentate N2Ox dipyrrin ligands thus obtained form a variety of complexes with 13 and 14 group elements, which are difficult to synthesize using the original N2 dipyrrin derivatives. Interestingly, these unique complexes exhibit novel structures, properties, and functions such as guest recognition, stimuli-responsive structural conversion, switching of the optical properties, excellent stability of the neutral radicals, etc. We believe that these multifunctional dipyrrin complexes will advance the basic chemistry of the dipyrrin complexes and develop their applications in the materials and medicinal chemistry fields.1 Introduction2 Linear Oligomers of Boron–Dipyrrin Complexes3 Cyclic Oligomers of Boron–Dipyrrin Complexes4 A Cyclic Oligomer of Zinc–Dipyrrin Complexes5 Group 13 Element Complexes of N2Ox Dipyrrins6 Chiral N2 and N2Ox Dipyrrin Complexes7 Group 14 Element Complexes of N2O2 Dipyrrins8 Other N2O2 Dipyrrin Complexes with Unique Properties and Functions9 Conclusion
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Sacarescu, Liviu, Rodinel Ardeleanu, Gabriela Sacarescu, Mihaela Simionescu et Ionel Mangalagiu. « Polysilane–Metal Complexes for Organic Semiconductors ». High Performance Polymers 19, no 5-6 (octobre 2007) : 501–9. http://dx.doi.org/10.1177/0954008306081193.

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New polysilane-metal complexes structures were obtained by the polycondensation reaction of α,ω-bis(chloromethyl)-polymethylphenylsilane with the Ni (II) complex of bis(salicylidene)ethylenedia-mine (salen). The chloro-functionalized polysilane was obtained by a modified Wurtz coupling procedure at low temperatures. To obtain the polymer-metal complex the resulted macroligand was complexed with metal cations. This structure is characterized by a highly localized electroactivitry in the redox moiety combined with a specific σ conjugative effect in the polysilane chain. Infrared, 1H NMR and UV-vis spectral analysis as well as gel permeation chromatography and thermogravimetric analysis were used to investigate the new chemical structures.
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Gonzalez, A., J. Marquet et M. Moreno-Mañas. « Metal complexes in organic synthesis. » Tetrahedron 42, no 15 (janvier 1986) : 4253–57. http://dx.doi.org/10.1016/s0040-4020(01)87650-x.

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Sumrra, Sajjad Hussain, Muhammad Ibrahim, Sabahat Ambreen, Muhammad Imran, Muhammad Danish et Fouzia Sultana Rehmani. « Synthesis, Spectral Characterization, and Biological Evaluation of Transition Metal Complexes of Bidentate N, O Donor Schiff Bases ». Bioinorganic Chemistry and Applications 2014 (2014) : 1–10. http://dx.doi.org/10.1155/2014/812924.

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New series of three bidentate N, O donor type Schiff bases(L1)–(L3)were prepared by using ethylene-1,2-diamine with 5-methyl furfural, 2-anisaldehyde, and 2-hydroxybenzaldehyde in an equimolar ratio. These ligands were further complexed with Co(II), Cu(II), Ni(II), and Zn(II) metals to produce their new metal complexes having an octahedral geometry. These compounds were characterized on the basis of their physical, spectral, and analytical data. Elemental analysis and spectral data of the uncomplexed ligands and their metal(II) complexes were found to be in good agreement with their structures, indicating high purity of all the compounds. All ligands and their metal complexes were screened for antimicrobial activity. The results of antimicrobial activity indicated that metal complexes have significantly higher activity than corresponding ligands. This higher activity might be due to chelation process which reduces the polarity of metal ion by coordinating with ligands.
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Mamedova, Shafa Agаеvna. « METAL COMPLEX CATALYSIS ». Globus 7, no 5(62) (4 août 2021) : 31–33. http://dx.doi.org/10.52013/2658-5197-62-5-7.

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Complexes of transition metals with chiral ligands are considered as catalysts. Among metal-containing organic complexes with semiconducting properties, compounds of the porphin series occupy a special place in electrocatalytic studies. The properties of the porphyrin macrocycle, their role in catalysis, and the influence of the nature of the metal on the catalytic properties of the complex are considered.
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Sun, Yimeng, Wei Xu, Chong-an Di et Daoben Zhu. « Metal-organic complexes-towards promising organic thermoelectric materials ». Synthetic Metals 225 (mars 2017) : 22–30. http://dx.doi.org/10.1016/j.synthmet.2016.12.001.

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Maurya, Chandan, et Sangeeta Bajpai. « Biological Applications of Metal Complexes of Dithiocarbamates ». Journal of Applied Science and Education (JASE) 2, no 1 (1 mars 2022) : 1–16. http://dx.doi.org/10.54060/jase/002.01.002.

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Dithiocarbamates are organosulphur ligands and form chelate compounds with metals. Their uses are reported in the field of accelerating vulcanization, pesticide, material science, organic synthesis, etc. Recent research demonstrated the potential of metal complexes of these ligands as good antifungal, antibacterial, and antitumor agents. Dithiocarbamate complexes have also been reported to use as a plasmonic sensor, as an inhibitor of proteasome, and for antioxidant and antileishmanial activity. This brief review presents the biological activities of metal complexes of dithiocarbamate.
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Saito, Gunzi, et Tsuyoshi Murata. « Mixed valency in organic charge transfer complexes ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 366, no 1862 (10 septembre 2007) : 139–50. http://dx.doi.org/10.1098/rsta.2007.2146.

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Mixed-valence (partial charge transfer state) and segregated stacking are the key factors for constructing organic metals. Here, we discuss the ionicity phase diagrams for a variety of charge transfer systems to provide a strategy for the development of functional organic materials (Mott insulator, semiconductor, superconductor, metal, complex isomer, neutral–ionic system, etc.).
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Dong, Jinqiao, Yan Liu et Yong Cui. « Supramolecular Chirality in Metal–Organic Complexes ». Accounts of Chemical Research 54, no 1 (18 décembre 2020) : 194–206. http://dx.doi.org/10.1021/acs.accounts.0c00604.

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Kasatkin, A. N., T. Yu Romanova, O. Yu Tsypyshev, G. A. Tolstikov et S. I. Lomakina. « Transition metal ?-complexes in organic synthesis ». Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 38, no 11 (novembre 1989) : 2410–15. http://dx.doi.org/10.1007/bf01168100.

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Thèses sur le sujet "Organic metal complexes"

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Jones, P. « Studies of chiral metal complexes ». Thesis, Bucks New University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373593.

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Green, G. « Transition metal oxo-complexes as organic oxidants ». Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37711.

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Andernach, Rolf. « Conjugated polymer-metal complexes for organic electronics ». Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/43382.

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Organometallic complexes play a crucial role in Organic Electronics and due to their interesting optoelectronic properties they have been widely applied in organic light-emitting diodes and organophotovoltaic devices. Organometallic complexes are often used in the form of small molecules and their exact orientation in the bulk material can have a major effect on device performance. In this work, different approaches of covalently incorporating metal-porphyrin complexes into polymers were explored with the aim of producing homogeneous donor-acceptor type polymers which allow for the elimination of phase separation effects within the active material of the respective devices. A set of design rules was developed for the creation of porphyrin-polymer complexes and their application as host-guest systems in the triplet-sensitisation of semi-conducting polymers was studied, determining the optimal functional groups as well as matching absorption and emission properties. To this end, a synthesis pathway was developed that enabled the creation of metal porphyrins as well as their specific functionalisation for use in different co-polymerisation reactions. Platinum (II), palladium (II) and zinc (II) porphyrins were synthesised and successfully incorporated into a series of semi-conducting polymers: regiorandom and regioregular poly(3-hexylthiophene) (P3HT), poly(bis(decylthiophene)phenylene) (TTP) and poly(para-phenylenevinylene) (PPV). Successful co-polymerisation was reported for all polymers and the electronic interaction between the polymer hosts and porphyrin guests was analysed. The successful creation of triplet-sensitised polymers was shown and the full triplet formation pathway was mapped by spectroscopic means, creating a novel tool for the generation and analysis of polymer triplet excitons. Finally, computational methods were used for the accurate description of polymer triplet excited states and their usefulness in the prediction of excited state properties was shown. Polymer models were designed, computed and compared to experimental data and the use of computational methods as a widely applicable and precise tool for determining polymer excited states was discussed, further substantiating the design rules developed throughout this work.
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Paver, Michael A. « Novel p-block metal anion complexes ». Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/271941.

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Hartstock, Frederick W. « Activation of organic molecules by transition metal complexes ». Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5306.

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Warner, P. « Asymmetric synthesis via transition metal acyl complexes ». Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355823.

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Wilkes, Stephen Brinley. « Studies on novel redox-active metal complexes ». Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359336.

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Rowe, Kathryn Elizabeth. « Mesomorphic 2,2'-bipyridines and their metal complexes ». Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265568.

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Quelch, Geoffrey E. « Theoretical studies of some transition metal complexes ». Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329083.

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Worayingyong, Attera O. « Metal complexes as catalysts for stereoselective synthesis ». Thesis, University of Aberdeen, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294145.

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Metal complexes have been used as catalysts for stereoselective syntheses in CC bond formation reactions, namely, alkyl- and allyl- additions to aldehydes. The enantiomeric alkylations involved reactions between Et2Zn and arylaldehydes in the presence of chiral templates, e.g. zinc-, titanium- and boron-complexes of (S)-(-)-2-amino-3-(p-hydroxyphenyl)-1,1-diphenylpropanol. The reaction has been proved to be catalytic, using 3-5 mol% of the chiral ligand in the addition of Et2Zn to p-tolualdehyde. Study of the substituent effects in arylaldehydes showed that p-tolualdehyde leads to the highest optical yield (83%ee) when a chiral Schiff base-zinc complex is formed. The in-situ produced chiral templates for the alkylations were studied by two different methods. Firstly, the alkyl metal itself; i.e. Et2Zn, acts as the metal key atom. Secondly, other metal compounds; i.e. BH3.THF and Ti(OPri)4 formed chiral auxiliary complexes for the additions of Et2Zn to arylaldehyde. The highest optical yield for 1-p-tolylpropanol [ca. 80%ee (S)] was obtained using the zinc- and boron-complexes. The chiral amino alcohol was also deposited onto silica gel to act as a heterogeneous catalyst. The asymmetric ethylations of p-tolualdehyde using the silica gel supported ligand have been tested with zinc-, titanium- and boron-complexes. Diethylzinc alone provides the best selectivity (53%ee), the values for the boron and the titanium systems are 16 and < 1%ee, respectively. On subsequent use of the solid catalyst, the optical yields fall off. Allylic additions of Bu3SnCH2CH=CH2 to arylaldehydes have been examined in the presence of the chiral amino alcohol and titanium compounds. The optimum result was found to occur when TiCl4 was reacted with the amino alcohol prior to the simultaneous addition of the reacting materials. However, the chiral allylic alcohol was obtained in low optical yield (31%ee).
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Livres sur le sujet "Organic metal complexes"

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Peter, Kündig E., et Böttcher A, dir. Transition metal arene [pi]-complexes in organic synthesis and catalysis. Berlin : Springer-Verlag, 2004.

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Photophysics and photochemistry of metal-containing polymers. Hoboken, N.J : Wiley-Blackwell, 2010.

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Kündig, E. Peter, dir. Transition Metal Arene π-Complexes in Organic Synthesis and Catalysis. Berlin, Heidelberg : Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b76615.

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National Research Council of Canada. Division of Energy. Peat Energy Program. Geochemistry of Metal-Organic Complexes in Naturally-Acidic Waters From Peatlands : Final Report. S.l : s.n, 1986.

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1951-, Lusty James R., Wearden Peter et Moreno Virtudes, dir. CRC handbook of nucleobase complexes : Transition metal complexes of naturally occuring nucleobases and their derivatives. Boca Raton, Fla : CRC Press, 1990.

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P, Fehlner Thomas, dir. Inorganometallic chemistry. New York : Plenum, 1992.

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Campora, Juan. Olefin Upgrading Catalysis by Nitrogen-based Metal Complexes I : State-of-the-art and Perspectives. Dordrecht : Springer Science+Business Media B.V., 2011.

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1949-, Miessler Gary L., dir. Organometallic chemistry. 2e éd. New York : Oxford University Press, 2010.

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1949-, Miessler Gary L., dir. Organometallic chemistry. Upper Saddle River, N.J : Prentice-Hall, 1997.

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Shotyk, William. Geochemistry of metal-organic complexes in naturally-acidic waters from peatlands : Final report submitted to Environment Canada. Ottawa : National Research Council, Canada Peat Energy program, 1986.

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Chapitres de livres sur le sujet "Organic metal complexes"

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Wiebus, Ernst, et Boy Cornils. « Biphasic Systems : Water — Organic ». Dans Catalysis by Metal Complexes, 105–43. Dordrecht : Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4087-3_5.

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Chaloner, Penny A., Miguel A. Esteruelas, Ferenc Joó et Luis A. Oro. « Homogeneous Hydrogenation in Organic Synthesis ». Dans Catalysis by Metal Complexes, 119–81. Dordrecht : Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-017-1791-5_4.

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Fujita, Makoto. « From Hofmann Complexes to Organic Coordination Networks ». Dans Metal-Organic Frameworks, 1–35. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470606858.ch1.

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Maiorana, S., C. Baldoli et E. Licandro. « Carbonylchromium(O) Complexes in Organic Synthesis ». Dans Catalysis by Metal Complexes, 261–86. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3408-8_13.

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Curci, Ruggero, et John O. Edwards. « Activation of Hydrogen Peroxide by Organic Compounds ». Dans Catalysis by Metal Complexes, 45–95. Dordrecht : Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-0984-2_3.

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Cenini, S., et C. Crotti. « Catalytic Carbonylations of Nitrogen Containing Organic Compounds ». Dans Catalysis by Metal Complexes, 311–28. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3408-8_15.

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Cowdery-Corvan, Robin, Susan P. Spooner, George L. McLendon et David G. Whitten. « Photoredox Chemistry of Metal Complexes in Microheterogeneous Media ». Dans Photosensitive Metal—Organic Systems, 261–79. Washington, DC : American Chemical Society, 1993. http://dx.doi.org/10.1021/ba-1993-0238.ch014.

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Kölle, U. « Photocatalytic Transformations of Organic Substrates Using Inorganic Salts and Complexes ». Dans Catalysis by Metal Complexes, 331–57. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-2626-9_11.

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Demonceau, A., A. J. Hubert et A. F. Noels. « Basic Principles in Carbene Chemistry and Applications to Organic Synthesis ». Dans Catalysis by Metal Complexes, 237–59. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3408-8_12.

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Maverick, Andrew W., Qin Yao, Abdul K. Mohammed et Leslie J. Henderson. « Photochemistry and Redox Catalysis Using Rhenium and Molybdenum Complexes ». Dans Photosensitive Metal—Organic Systems, 131–46. Washington, DC : American Chemical Society, 1993. http://dx.doi.org/10.1021/ba-1993-0238.ch007.

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Actes de conférences sur le sujet "Organic metal complexes"

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Korcala, Andrzej, Przemyslaw Plociennik, Meriem Lougdali et Rania Anoua. « Admittance Spectroscopy of Organic and Metal-Organic Complexes ». Dans 2019 21st International Conference on Transparent Optical Networks (ICTON). IEEE, 2019. http://dx.doi.org/10.1109/icton.2019.8840216.

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Albrektiene, Ramune, Mindaugas Rimeika et Ruta Grazeniene. « Organic fractions and metal-organic complexes in the groundwater ». Dans The 9th International Conference "Environmental Engineering 2014". Vilnius, Lithuania : Vilnius Gediminas Technical University Press “Technika” 2014, 2014. http://dx.doi.org/10.3846/enviro.2014.070.

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Pietschnig, Rudolf, Carmen Moser, Stefan Spirk et Sven Schäfer. « Synthesis and Structure of Transition Metal Bisalkinylselenolato Complexes ». Dans The 9th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2005. http://dx.doi.org/10.3390/ecsoc-9-01518.

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Shensky, William M., Ryan M. O'Donnell, Jianmin Shi, Seungchul Lee, Michael J. Ferry et Neal K. Bambha. « Broadband excited-state absorption in metal dithiolene complexes (Conference Presentation) ». Dans Organic Photonic Materials and Devices XXI, sous la direction de Christopher E. Tabor, François Kajzar et Toshikuni Kaino. SPIE, 2019. http://dx.doi.org/10.1117/12.2508779.

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Sheats, John E., Andrew Jones, Albert Lang, Felicia Bland et Elizabeth Hernandez. « Organotransition Metal Complexes as π Acceptors in Non-linear Optical Materials ». Dans Organic Thin Films for Photonic Applications. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/otfa.1993.wd.22.

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Previous investigators 1-4 have employed ferrocenyl derivatives as strong π-electron donors in the preparation of highly conjugated organic molecules such as Ia-c with high values of the second order hyperpolarizability, β.
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Wahyuningsih, S., A. H. Ramelan, I. Badriyah, I. Badriyah, I. O. Kristy, N. S. Dewi et S. B. Rahardjo. « Third row metal complexes as an alternative dye in dye sensitized solar cell system ». Dans SPIE Organic Photonics + Electronics, sous la direction de Zakya H. Kafafi et Paul A. Lane. SPIE, 2013. http://dx.doi.org/10.1117/12.2025228.

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Jece, Annija, Armands Ruduss, Kitija A. Štucere, Aivars Vembris et Kaspars Traskovskis. « TADF active carbene-metal-amide complexes exhibiting through-space charge transfer : an impact of metal atom ». Dans Organic Electronics and Photonics : Fundamentals and Devices III, sous la direction de Sebastian Reineke, Koen Vandewal et Wouter Maes. SPIE, 2022. http://dx.doi.org/10.1117/12.2621156.

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McKerns, Michael, Qiu Wei, Chris Lawson, Sergey B. Mirov et Gary M. Gray. « Studies of Metal Organic Complexes with a powerful tunable laser ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2003. http://dx.doi.org/10.1364/fio.2003.mt19.

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Turro, Claudia, et Rebkah A. Wroblewski. « Excited states of transition metal complexes for medical applications and solar energy conversion ». Dans Organic Photonic Materials and Devices XXIV, sous la direction de Ileana Rau, Okihiro Sugihara et William M. Shensky. SPIE, 2022. http://dx.doi.org/10.1117/12.2613362.

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Li, Jian. « Blue emitting square planar metal complexes for displays and lighting applications ». Dans Organic and Hybrid Light Emitting Materials and Devices XXV, sous la direction de Tae-Woo Lee, Franky So et Chihaya Adachi. SPIE, 2021. http://dx.doi.org/10.1117/12.2596812.

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Rapports d'organisations sur le sujet "Organic metal complexes"

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Lawson, Chris M., et Gary M. Gray. New Metal Organic Nonlinear Optical Complexes. Fort Belvoir, VA : Defense Technical Information Center, décembre 2000. http://dx.doi.org/10.21236/ada391105.

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Tait, Steven. Single-Site Metal Organic Complexes on Oxide Supports for Selective Alkane Functionalization. Office of Scientific and Technical Information (OSTI), juin 2021. http://dx.doi.org/10.2172/1797443.

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Becker, Udo, et Rodney Ewing. Actinide Incorporation and Radiation Effects in U(VI) Solids Actinide sorption and reduction on sulfides, oxides, and clay minerals Photoexcitation of Mn-oxide Minerals and Actinide Metal-organic Frameworks for Catalysis of Actinyl Complexes and Nanoclusters. Office of Scientific and Technical Information (OSTI), décembre 2019. http://dx.doi.org/10.2172/1615667.

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Tait, Steven L. Final Technical Report : Metal—Organic Surface Catalyst for Low-temperature Methane Oxidation : Bi-functional Union of Metal—Organic Complex and Chemically Complementary Surface. Office of Scientific and Technical Information (OSTI), octobre 2016. http://dx.doi.org/10.2172/1411530.

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Jung, Carina, Matthew Carr, Denise Lindsay, Eric Fleischman et Chandler Roesch. Microbiome perturbations during domestication of the green June beetle (Cotinis nitida). Engineer Research and Development Center (U.S.), février 2022. http://dx.doi.org/10.21079/11681/43342.

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Animal-associated microbiomes are critical to the well-being and proper functioning of the animal host, but only limited studies have examined in-sect microbiomes across different developmental stages. These studies revealed large shifts in microbiome communities, often because of significant shifts in diet during insects’ life cycle. Establishing insect colonies as model laboratory organisms and understanding how to properly feed and care for animals with complex and dynamic life cycles requires improved data. This study examined laboratory raised green June beetles (Cotinis nitida) captured from the field upon emergence from pupae. Starting with wild-caught adults, two generations of beetles were reared in the laboratory, ending with an entirely laboratory raised generation of larvae. The study compared the microbiomes of each generation and the microbiomes of larvae to adults. This study suggests that a diet of commercial, washed fruit for adults and commercial, packaged, organic alfalfa meal for larvae resulted in depauperate gut microbiome communities. Fermentative yeasts were completely absent in the laboratory-raised adults, and major bacterial population shifts occurred from one generation to the next, coupled with high morbidity and mortality in the laboratory-raised generation. Providing laboratory-raised beetles fresh-collected fruit and the larvae field-harvested detritus may therefore vastly improve their health and survival.
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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova et Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, janvier 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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Cao, Xianling, Xuanyou Zhou, Naixin Xu, Songchang Chang et Chenming Xu. Association of IL-4 and IL-10 Polymorphisms with Preterm Birth Susceptibility : A Systematic Review and Meta-Analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, avril 2022. http://dx.doi.org/10.37766/inplasy2022.4.0044.

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Review question / Objective: The aim of our systematic review and meta-analysis was to summarize the effects of IL-4 and IL-10 gene polymorphism and clarify their possible association with PTB. Condition being studied: World Health Organization (WHO) defines preterm birth (PTB) as babies born alive before 37 weeks of pregnancy are completed. The new estimates show that the prevalence of PTB during 2014 ranged from 8.7% to13.4% of all live births, about 15 million preterm babies born each year. Besides, PTB is the leading cause of death worldwide for children below 5 years of age. Babies born preterm are at an increased risk of short-term and long-term complications attributed to immaturity of multiple organ systems, such as cerebral palsy, intellectual disabilities, vision and hearing impairments, and impaired cognitive development. PTB has become a worldwide public health problem, but its etiology remains unclear. Accumulating evidence shows that PTB is a syndrome that can be attributed to a variety of pathological processes(5). Inflammatory diseases and genetic background are known risk factors for PTB, many studies had shown that genetic variations in proinflammatory cytokines such as tumor necrosis factor-α (TNF-α) and interleukin-1 α (IL-1 α) are associated with increased risk of PTB, but the relationship between genetic polymorphism in anti-inflammatory cytokines and risk of PTB remains controversial.
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Desbarats, A. J., et J. B. Percival. Hydrogeochemistry of mine tailings from a carbonatite-hosted Nb-REE deposit, Oka, Quebec, Canada. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331256.

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Environmental impacts associated with the mining of carbonatite deposits are an emerging concern due to the demand for critical metals. This study investigates the chemistry of tailings seepage at the former Saint Lawrence Columbium mine near Oka, Québec, Canada, which produced pyrochlore concentrate and ferroniobium from a carbonatite-hosted Nb-REE deposit. Its objectives are to characterize the mineralogy of the tailings and their pore water and effluent chemistries. Geochemical mass balance modeling, constrained by aqueous speciation modeling and mineralogy, is then used to identify reactions controlling the chemical evolution of pore water along its flow path through the tailings impoundment. The tailings are composed mainly of REE-enriched calcite (82 wt. %), biotite (12 wt. %) and fluorapatite (4 wt. %). Minor minerals include chlorite, pyrite, sphalerite, molybdenite and unrecovered pyrochlore. Secondary minerals include gypsum, barite and strontianite. Within the unsaturated zone, pore water chemistry is controlled by sulfide oxidation and calcite dissolution with acid neutralization. With increasing depth below the water table, pore water composition reflects gypsum dissolution followed by sulfate reduction and FeS precipitation driven by the oxidation of organic carbon in the tailings. Concomitantly, incongruent dissolution of biotite and chlorite releases K, Mg, Fe, Mn, Ba and F, forming kaolinite and Ca-smectite. Cation exchange reactions further remove Ca from solution, increasing concentrations of Na and K. Fluoride concentrations reach 23 mg/L and 8 mg/L in tailings pore water and effluent, respectively. At a pH of 8.3, Mo is highly mobile and reaches an average concentration of 83 µg/L in tailings effluent. Although U also forms mobile complexes, concentrations do not exceed 16 µg/L due to the low solubility of its pyrochlore host. Adsorption and the low solubility of pyrochlore limit concentrations of Nb to less than 49 µg/L. Cerium, from calcite dissolution, is strongly adsorbed although it reaches concentrations (unfiltered) in excess of 1 mg/L and 100 µg/L in pore water and effluent, respectively. Mine tailings from carbonatite deposits are enriched in a variety of incompatible elements with mineral hosts of varying reactivity. Some of these elements, such as F and Mo, may represent contaminants of concern because of their mobility in alkaline tailings waters.
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