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Juan A. Casares - One of the best experts on this subject based on the ideXlab platform.
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[Cu(C6Cl2F3)(tht)]4: An Extremely Efficient Catalyst for the Aryl Scrambling between Palladium Complexes
Organometallics, 2019Co-Authors: María Pérez-iglesias, Olmo Lozano-lavilla, Juan A. CasaresAbstract:The Copper Compound [Cu(C6Cl2F3)(tht)]4 (1) (tht: tetrahydrothiophene) is an excellent catalyst for the trans-to-cis isomerization of complexes [PdAr2(tht)2](Ar: fluoroaryl) and also for the exchange of aryls between those palladium complexes. Herein, we also communicate the synthesis and characterization of 1 and some of its derivatives. The X-ray structure of 1 shows a linear chain of Copper atoms, supported by fluoroaryl rings. The nuclear magnetic resonance 19F diffusion-ordered spectroscopy study indicates that this structure is preserved in solution, although it is in equilibrium with other species.
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[Cu(C6Cl2F3)(tht)]4: An Extremely Efficient Catalyst for the Aryl Scrambling between Palladium Complexes
2019Co-Authors: María Pérez-iglesias, Olmo Lozano-lavilla, Juan A. CasaresAbstract:The Copper Compound [Cu(C6Cl2F3)(tht)]4 (1) (tht: tetrahydrothiophene) is an excellent catalyst for the trans-to-cis isomerization of complexes [PdAr2(tht)2](Ar: fluoroaryl) and also for the exchange of aryls between those palladium complexes. Herein, we also communicate the synthesis and characterization of 1 and some of its derivatives. The X-ray structure of 1 shows a linear chain of Copper atoms, supported by fluoroaryl rings. The nuclear magnetic resonance 19F diffusion-ordered spectroscopy study indicates that this structure is preserved in solution, although it is in equilibrium with other species
Leonardo D Slep - One of the best experts on this subject based on the ideXlab platform.
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an unexpected carboxylato bridged only hexanuclear Copper Compound
Inorganica Chimica Acta, 2011Co-Authors: Maria A Castro, Marcia Rusjan, Daniel Roberto Vega, O Pena, Thomas Weyhermuller, Fabio D Cukiernik, Leonardo D SlepAbstract:Fil: Castro, Maria Ana. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Quimica Inorganica, Analitica y Quimica Fisica; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Instituto de Quimica, Fisica de los Materiales, Medioambiente y Energia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Quimica, Fisica de los Materiales, Medioambiente y Energia; Argentina
Leite, Marco Antonio Barreto - One of the best experts on this subject based on the ideXlab platform.
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Estrategias para obtenção de precursores unicos para a deposição de Nb2O5 ZrO2 e CuO por deposição quimica de vapor por metalorganicos
[s.n.], 2018Co-Authors: Leite, Marco Antonio BarretoAbstract:Orientador: Maria Domingues VargasTese (doutorado) - Universidade Estadual de Campinas, Instituto de QuimicaResumo: Este trabalho teve como objetivo estudar precursores únicos para a deposição de filmes finos dos óxidos metálicos de nióbio, zircônio e cobre. Foram sintetizados e caracterizados os compostos [Nb(OPr)5]2 (2.1), [Nb(OPr)5(HOPr)] (2.2), [{Zr(HOBu)2(HFTB)2}(HOBu)] (3.1), [Cu(hfacac)2L] onde L=THF (4.1), O(Et)2 (4.2), O(Pr)2 (4.3), cis-trans DMOTHF (4.4) e cis-trans DMTHF (4.5) (HFTB = hexafluorotercbutóxido, hfacac = 1,1,1,5,5,5,-hexafluoro-2,4-pentanodiona, DMOTHF = 1,4-dimetoxotetrahdrofurano e DMTHF = 1,4-dimetiltetrahidrofurano). Os compostos foram analisados e caracterizados por espectroscopia no infravermelho, Raman, RMN ou RPE e difratometria de raios-X de monocristal (composto 3.1). Os dados cristalográficos do composto (2.1) são a= 9,632(2) Å, b= 9,799(4) Å, c= 22,108(6) Å, a = 84,30(5)°, b = 82,07(7)°, g = 76,05(9)°, Z= 2 grupo espacial P(-1). O alcóxido heteroléptico de zircônio 3.1 foi exaustivamente analisado por RMN de H a -90°C e foi proposta uma estrutura em solução para este composto. O composto 4.3 foi analisado por RPE-ESEEM e as distâncias entre os átomos de hidrogênio e o átomo de cobre foram medidas. Foram feitos estudos térmicos de DQV dos compostos 2.1, 2.2, 3.1 e 4.1. Os filmes dos óxidos metálicos obtidos por DQV foram caracterizados por XPS, UV-Vis de reflectância e EDX que indicavam ser filmes de Nb2O5 e Cu2O. Os produtos voláteis eliminados na DQV foram identificados por RMN em solução e, a partir da identificação dos produtos voláteis, foram propostos mecanismos das reações de decomposição do precursor 2.1 e 3.1.Abstract: The aims of this work were to propose and study precursors for low pressure chemical vapor deposition of metal oxides thin films of niobium, zirconium and Copper to be used in the electronic industry. This work describes the synthesis and characterization of four new precursors for MOCVD: [Nb(OPr)5]2 (2.1), [Nb(OPr)5(HOPr)] (2.2), [{Zr(HOBu)2(HFTB)2}(HOBu)] (3.1), [Cu(hfacac)2L] where L=THF (4.1), O(Et)2 (4.2), O(Pr)2 (4.3), cis-trans DMOTHF (4.4) and cis-trans DMTHF (4.5). The Compounds were analyzed and characterized by FTIR, Raman, RMN and EPR spectroscopy and in one case (Compound 2.1) by a X-ray diffraction study. Crystallographic data for Compound (2.1) are a= 9,632(2) Å, b= 9,799(4) Å, c= 22,108(6) Å, a = 84,30(5)°, b = 82,07(7)°, g = 76,05(9)°, Z= 2 and it is in space group P(-1). The heteroleptic zirconium alkoxide, Compound 3.1 was exhaustively characterized by H-RMN at -90°C and a structure in solution was proposed. In order to obtain the internuclear distance between hydrogen and Copper atoms, the Copper Compound 4.3 was studied by EPR-ESEEM. CVD experiments were carried out for all proposed precursors but only Compounds 2.1, 2.2, 3.1 and 4.1 resulted in successful thin film deposits. These thin films were characterized by XPS, UV-Vis reflectance and also EDS as thin films of Nb2O5 and Cu2O, respectively. The volatile part produced in the CVD reactor was characterized by H and F-RMN spectroscopies. These results led to the proposition of a mechanism for the deposition reactions of the precursors 2.1 and 3.1.Doutorad
Marcos Antonio Barreto Leite - One of the best experts on this subject based on the ideXlab platform.
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Estrategias para obtenção de precursores unicos para a deposição de Nb2O5 ZrO2 e CuO por deposição quimica de vapor por metalorganicos
2017Co-Authors: Marcos Antonio Barreto LeiteAbstract:Resumo: Este trabalho teve como objetivo estudar precursores únicos para a deposição de filmes finos dos óxidos metálicos de nióbio, zircônio e cobre. Foram sintetizados e caracterizados os compostos [Nb(OPr)5]2 (2.1), [Nb(OPr)5(HOPr)] (2.2), [{Zr(HOBu)2(HFTB)2}(HOBu)] (3.1), [Cu(hfacac)2L] onde L=THF (4.1), O(Et)2 (4.2), O(Pr)2 (4.3), cis-trans DMOTHF (4.4) e cis-trans DMTHF (4.5) (HFTB = hexafluorotercbutóxido, hfacac = 1,1,1,5,5,5,-hexafluoro-2,4-pentanodiona, DMOTHF = 1,4-dimetoxotetrahdrofurano e DMTHF = 1,4-dimetiltetrahidrofurano). Os compostos foram analisados e caracterizados por espectroscopia no infravermelho, Raman, RMN ou RPE e difratometria de raios-X de monocristal (composto 3.1). Os dados cristalográficos do composto (2.1) são a= 9,632(2) Å, b= 9,799(4) Å, c= 22,108(6) Å, a = 84,30(5)°, b = 82,07(7)°, g = 76,05(9)°, Z= 2 grupo espacial P(-1). O alcóxido heteroléptico de zircônio 3.1 foi exaustivamente analisado por RMN de H a -90°C e foi proposta uma estrutura em solução para este composto. O composto 4.3 foi analisado por RPE-ESEEM e as distâncias entre os átomos de hidrogênio e o átomo de cobre foram medidas. Foram feitos estudos térmicos de DQV dos compostos 2.1, 2.2, 3.1 e 4.1. Os filmes dos óxidos metálicos obtidos por DQV foram caracterizados por XPS, UV-Vis de reflectância e EDX que indicavam ser filmes de Nb2O5 e Cu2O. Os produtos voláteis eliminados na DQV foram identificados por RMN em solução e, a partir da identificação dos produtos voláteis, foram propostos mecanismos das reações de decomposição do precursor 2.1 e 3.1.Abstract: The aims of this work were to propose and study precursors for low pressure chemical vapor deposition of metal oxides thin films of niobium, zirconium and Copper to be used in the electronic industry. This work describes the synthesis and characterization of four new precursors for MOCVD: [Nb(OPr)5]2 (2.1), [Nb(OPr)5(HOPr)] (2.2), [{Zr(HOBu)2(HFTB)2}(HOBu)] (3.1), [Cu(hfacac)2L] where L=THF (4.1), O(Et)2 (4.2), O(Pr)2 (4.3), cis-trans DMOTHF (4.4) and cis-trans DMTHF (4.5). The Compounds were analyzed and characterized by FTIR, Raman, RMN and EPR spectroscopy and in one case (Compound 2.1) by a X-ray diffraction study. Crystallographic data for Compound (2.1) are a= 9,632(2) Å, b= 9,799(4) Å, c= 22,108(6) Å, a = 84,30(5)°, b = 82,07(7)°, g = 76,05(9)°, Z= 2 and it is in space group P(-1). The heteroleptic zirconium alkoxide, Compound 3.1 was exhaustively characterized by H-RMN at -90°C and a structure in solution was proposed. In order to obtain the internuclear distance between hydrogen and Copper atoms, the Copper Compound 4.3 was studied by EPR-ESEEM. CVD experiments were carried out for all proposed precursors but only Compounds 2.1, 2.2, 3.1 and 4.1 resulted in successful thin film deposits. These thin films were characterized by XPS, UV-Vis reflectance and also EDS as thin films of Nb2O5 and Cu2O, respectively. The volatile part produced in the CVD reactor was characterized by H and F-RMN spectroscopies. These results led to the proposition of a mechanism for the deposition reactions of the precursors 2.1 and 3.1
Ruiqing Sun - One of the best experts on this subject based on the ideXlab platform.
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influence of synthesis condition on product formation hydrothermal auto oxidated synthesis of five Copper halides with ratio of cu i cu ii in 1 1 2 1 3 1 4 1 and 1 0
Journal of Solid State Chemistry, 2008Co-Authors: Shuai Zhang, Yanning Cao, Hanhui Zhang, Xiaochuan Chai, Yiping Chen, Ruiqing SunAbstract:The hydrothermal synthesis and structural characterization of five Copper iodides derived from chelated ligands, 1, 10-phenanthroline (phen), ethylenediamine (en) and 1, 3-propanediamine, are reported. Except monovalent Copper Compound 1 ((phen)Cu{sub 3}I{sub 3}1), other four Compounds ([Cu(phen){sub 2}I][CuI{sub 2}] 2, [Cu(phen){sub 2}I][Cu{sub 3}I{sub 4}] 3, [Cu(en){sub 2}][Cu{sub 4}(phen){sub 2}I{sub 6}] 4 and [Cu(1, 3-propanediamine){sub 2}][CuI{sub 2}]{sub 2}5) are mixed-valent Cu(I)-Cu(II) Compounds by partially auto-oxidated from Cu(I). Supramolecular frameworks of these Compounds can be assembled by C/N-H...I hydrogen bonds, Cu(I)-Cu(I) interaction, weak Cu-I semicoordinate interaction, C-H...{pi} and {pi}-{pi} stacking interactions. It's noteworthy that we find hydrothermal synthesis under higher pH value, higher synthesis temperature and longer reaction time can obtain higher ratio of Cu(I)/Cu(II) Copper iodides and organic ligand with lower steric hinderance is prone to coordinated with divalent Copper to form cation unit. Finally, the fluorescent study shows 1 exhibits intense orange-red luminescence with long lifetime at 293 K and more intense emission and longer lifetime at 77 K. Moreover, the room temperature EPR spectra of above five Compounds not only show the valence of Copper but demonstrate the coordination environment of Cu(II) centre. - Graphical abstract: The influence of hydrothermal synthesis condition on the ratio of Cu(I)/Cu(II) of five Coppermore » iodides, with 1:0, 1:1, 3:1, 4:1, 2:1, respectively, is deduced and the rivalrousness of 1,10-phenanthroline, ethylenediamine and 1, 3-propanediamine is discussed as well. The fluorescent study shows 1 exhibits intense orange-red luminescence with long lifetime ({tau}=1.25 {mu}s) at 293 K and more intense emission and longer lifetime({tau}=6.95 {mu}s) at 77 K.« less