The binuclear Schiff base complexes prepared by condensation 2,6-diamino-pyridine and salicylaldehyde (LH) by using microwave and adding metal salts to ligand by same ratio. The Schiff base ligand was checked by infra...The binuclear Schiff base complexes prepared by condensation 2,6-diamino-pyridine and salicylaldehyde (LH) by using microwave and adding metal salts to ligand by same ratio. The Schiff base ligand was checked by infrared, electronic spectra and 1HNMR spectroscopy and prepared complexes characterized by molar conductivity, infrared, electronic spectra and susceptibility measurements. The values of molar conductivities reveal that the complexes are non-electrolytes, from obtained data of electronic spectra and magnetic moment, an octahedral geometry was suggested, coordinated to the metal ions in a manner with N donor sites of imine groups, and oxygen of phenolic OH group.展开更多
We report here the calculations on electronic structures of mono- and bi-nuclear benzene - transition metal sandwich complexes by means of CNDO/2 program, on the basis of molecular orbital components, atomic net charg...We report here the calculations on electronic structures of mono- and bi-nuclear benzene - transition metal sandwich complexes by means of CNDO/2 program, on the basis of molecular orbital components, atomic net charges and bond orders, the bonding pictures are analysed and discussed.展开更多
The first binuclear iron fullerene derivative of(η 2 C 60 )[Fe(CO) 2(C 5H 5)] 2 , which was yellow brown and sensitive to air and moisture, was prepared by the reaction of trans [Fe(CO) 2(C 5H 5)] 2 with C 60 in benz...The first binuclear iron fullerene derivative of(η 2 C 60 )[Fe(CO) 2(C 5H 5)] 2 , which was yellow brown and sensitive to air and moisture, was prepared by the reaction of trans [Fe(CO) 2(C 5H 5)] 2 with C 60 in benzene under an atmosphere of dried nitrogen using conventional Schlenk techniques and has been characterized by using elementary analysis and IR, 1H NMR, 13 C NMR and XPS spectra. The infrared spectrum of the title compound indicates the disappearance of ν CO at 1 760 cm -1 for bridge carbonyl and the appearance of the only terminal CO lying at a higher wave number than that of the starting material, which reveals the electron deficient behavior of C 60 . And the important 1H, 13 C NMR chemical shift and XPS of trans [Fe(CO) 2(C 5H 5)] 2 , C 60 and its novel complex along with their relative assignments are briefly discussed.展开更多
Eleven homobinuclear macrocyclic rare earth metal ions complexes are obtained as com-pounds of 2:2 Schiff base formed by condensing 2,6-diformyl-4-tert-Butylphenol and triethy-lenetetramine by a template procedure usi...Eleven homobinuclear macrocyclic rare earth metal ions complexes are obtained as com-pounds of 2:2 Schiff base formed by condensing 2,6-diformyl-4-tert-Butylphenol and triethy-lenetetramine by a template procedure using rare earth metal isothiocyanates. These complexesare characterized by elemental analyses, FABMS, IR, conductivity and magnetic susceptibility.The variable-temperature magnetic susceptibility （4--300K） of complexes of Gd（Ⅲ） and Tb（Ⅲ） has been determined. A satisfactory fit to theoretical curve derived from spin Hamil-tonian operator was obtained by least squares method. The exchange interaction parameters areJ =-0.220 cm<sup>-1</sup> for Gd, ,ZJ<sup>?</sup>=-0.052 cm<sup>-1</sup> for Tb. The results indicate a very weak anti-ferromagnetic interaction between Gd<sup>3+</sup>-Gd<sup>3+</sup>, Tb<sup>3+</sup>-Tb<sup>3+</sup> ions.展开更多
文摘The binuclear Schiff base complexes prepared by condensation 2,6-diamino-pyridine and salicylaldehyde (LH) by using microwave and adding metal salts to ligand by same ratio. The Schiff base ligand was checked by infrared, electronic spectra and 1HNMR spectroscopy and prepared complexes characterized by molar conductivity, infrared, electronic spectra and susceptibility measurements. The values of molar conductivities reveal that the complexes are non-electrolytes, from obtained data of electronic spectra and magnetic moment, an octahedral geometry was suggested, coordinated to the metal ions in a manner with N donor sites of imine groups, and oxygen of phenolic OH group.
文摘We report here the calculations on electronic structures of mono- and bi-nuclear benzene - transition metal sandwich complexes by means of CNDO/2 program, on the basis of molecular orbital components, atomic net charges and bond orders, the bonding pictures are analysed and discussed.
文摘The first binuclear iron fullerene derivative of(η 2 C 60 )[Fe(CO) 2(C 5H 5)] 2 , which was yellow brown and sensitive to air and moisture, was prepared by the reaction of trans [Fe(CO) 2(C 5H 5)] 2 with C 60 in benzene under an atmosphere of dried nitrogen using conventional Schlenk techniques and has been characterized by using elementary analysis and IR, 1H NMR, 13 C NMR and XPS spectra. The infrared spectrum of the title compound indicates the disappearance of ν CO at 1 760 cm -1 for bridge carbonyl and the appearance of the only terminal CO lying at a higher wave number than that of the starting material, which reveals the electron deficient behavior of C 60 . And the important 1H, 13 C NMR chemical shift and XPS of trans [Fe(CO) 2(C 5H 5)] 2 , C 60 and its novel complex along with their relative assignments are briefly discussed.
基金Project supported by the National Natural Science Foundation of China.
文摘Eleven homobinuclear macrocyclic rare earth metal ions complexes are obtained as com-pounds of 2:2 Schiff base formed by condensing 2,6-diformyl-4-tert-Butylphenol and triethy-lenetetramine by a template procedure using rare earth metal isothiocyanates. These complexesare characterized by elemental analyses, FABMS, IR, conductivity and magnetic susceptibility.The variable-temperature magnetic susceptibility （4--300K） of complexes of Gd（Ⅲ） and Tb（Ⅲ） has been determined. A satisfactory fit to theoretical curve derived from spin Hamil-tonian operator was obtained by least squares method. The exchange interaction parameters areJ =-0.220 cm<sup>-1</sup> for Gd, ,ZJ<sup>?</sup>=-0.052 cm<sup>-1</sup> for Tb. The results indicate a very weak anti-ferromagnetic interaction between Gd<sup>3+</sup>-Gd<sup>3+</sup>, Tb<sup>3+</sup>-Tb<sup>3+</sup> ions.
