Three inexpensive and air-/moisture-stable Salen-Cu complexes 1-3 were evaluated to be a novel class of catalysts for the N-arylation of imidazoles with aryl halides. A variety of aryl iodides, bromides underwent the ...Three inexpensive and air-/moisture-stable Salen-Cu complexes 1-3 were evaluated to be a novel class of catalysts for the N-arylation of imidazoles with aryl halides. A variety of aryl iodides, bromides underwent the coupling with imida-zoles, promoted by the complex 3, in moderate to excellent yields without the protection by an inert gas.展开更多
A new mononuclear Cu（Ⅱ） dithiocarbamate complex CuI（prdtc）（phen） 1 （prdtc = N-pyrrolidinyldithiocarbamate, phen = 1,10-phenanthroline） was synthesized and characterized by elemental analysis, IR spectrum, and...A new mononuclear Cu（Ⅱ） dithiocarbamate complex CuI（prdtc）（phen） 1 （prdtc = N-pyrrolidinyldithiocarbamate, phen = 1,10-phenanthroline） was synthesized and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/c with a = 8.7110（9）, b = 14.7143（14）, c = 14.8507（15） A, β = 109.721（6）°, V = 1791.9（3） A3, Z = 4, Dc = 1.916 g/cm3, CI7H16CulN3S2, Mr = 516.89, λ（MoKa） = 0.71073A,μ = 3.178 mm^-1, F（000） = 1012, the final R = 0.0369 and wR = 0.0987. A total of 4082 unique reflections were collected, of which 2916 with I 〉 2σ（I） were observed. The Cu（Ⅱ） atom is five-coordinated in a distorted square-pyramidal geometry by one I atom in the apical position, two S atoms from a prdtc ligand and two N atoms from a phen ligand in the basal plane. There exist face-to-face aromatic π-π stacking interactions between adjacent phen ligands stabilizing the structure and making the complex assemble into a 1D structure along the a axis. It can be concluded that the difference of the dtc flexibility and reaction conditions result in the structural difference between complex 1 and CuI（dmdtc）（phen） （dmdtc = N, N-dimethyldithiocarbamate）.展开更多
The trinuclear Cu( Ⅱ) and Zn(Ⅱ) complexes [ ( CuTPA)3 (μ3-CO3) ] ( ClO4)4(Ⅰ) and [ ( ZnTPA)3μ3-CO3)](ClO4)4 (2) (TPA = tri(pyridylmethyl)amine) have been synthesized. X-ray structure analysis of the two complexes...The trinuclear Cu( Ⅱ) and Zn(Ⅱ) complexes [ ( CuTPA)3 (μ3-CO3) ] ( ClO4)4(Ⅰ) and [ ( ZnTPA)3μ3-CO3)](ClO4)4 (2) (TPA = tri(pyridylmethyl)amine) have been synthesized. X-ray structure analysis of the two complexes proves that CO32- anion has an unusual triply bridging ligand, bridging three CuTPA and ZnTPA units respectively , and assembles new trinuclear complexes. The CO32- comes from atmospheric CO2 . The structure of each trinuclear unit consists of three copper or zinc atoms in a five-coordinate triangular bipyramidal environment. The [ (CuTPA)3(μ3-CO3)](C1O4)4 compound shows a very weak antiferromagnetic coupling.展开更多
文摘Three inexpensive and air-/moisture-stable Salen-Cu complexes 1-3 were evaluated to be a novel class of catalysts for the N-arylation of imidazoles with aryl halides. A variety of aryl iodides, bromides underwent the coupling with imida-zoles, promoted by the complex 3, in moderate to excellent yields without the protection by an inert gas.
基金supported by the National Natural Science Foundation of China (Nos. 50572030 and 50372022)the Research Fund of Huaqiao University (No. 06BS216)the Young Talent Program of Fujian Province (No. 2007F3060)
文摘A new mononuclear Cu（Ⅱ） dithiocarbamate complex CuI（prdtc）（phen） 1 （prdtc = N-pyrrolidinyldithiocarbamate, phen = 1,10-phenanthroline） was synthesized and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/c with a = 8.7110（9）, b = 14.7143（14）, c = 14.8507（15） A, β = 109.721（6）°, V = 1791.9（3） A3, Z = 4, Dc = 1.916 g/cm3, CI7H16CulN3S2, Mr = 516.89, λ（MoKa） = 0.71073A,μ = 3.178 mm^-1, F（000） = 1012, the final R = 0.0369 and wR = 0.0987. A total of 4082 unique reflections were collected, of which 2916 with I 〉 2σ（I） were observed. The Cu（Ⅱ） atom is five-coordinated in a distorted square-pyramidal geometry by one I atom in the apical position, two S atoms from a prdtc ligand and two N atoms from a phen ligand in the basal plane. There exist face-to-face aromatic π-π stacking interactions between adjacent phen ligands stabilizing the structure and making the complex assemble into a 1D structure along the a axis. It can be concluded that the difference of the dtc flexibility and reaction conditions result in the structural difference between complex 1 and CuI（dmdtc）（phen） （dmdtc = N, N-dimethyldithiocarbamate）.
基金Project supported by the National Natural Science Foundation of China (Gran No .29771021).
文摘The trinuclear Cu( Ⅱ) and Zn(Ⅱ) complexes [ ( CuTPA)3 (μ3-CO3) ] ( ClO4)4(Ⅰ) and [ ( ZnTPA)3μ3-CO3)](ClO4)4 (2) (TPA = tri(pyridylmethyl)amine) have been synthesized. X-ray structure analysis of the two complexes proves that CO32- anion has an unusual triply bridging ligand, bridging three CuTPA and ZnTPA units respectively , and assembles new trinuclear complexes. The CO32- comes from atmospheric CO2 . The structure of each trinuclear unit consists of three copper or zinc atoms in a five-coordinate triangular bipyramidal environment. The [ (CuTPA)3(μ3-CO3)](C1O4)4 compound shows a very weak antiferromagnetic coupling.
