Four new u-oxamido heterobinuclear complexes have been synthesized and identified as [Cu(oxap)Fe(L)2]SO4, where oxap denotes the N, N'-bis(2-aminopropyl)oxamido dianion and L represents diaminoethane (en); 1,3-dia...Four new u-oxamido heterobinuclear complexes have been synthesized and identified as [Cu(oxap)Fe(L)2]SO4, where oxap denotes the N, N'-bis(2-aminopropyl)oxamido dianion and L represents diaminoethane (en); 1,3-diaminopropane (pn); 1,2-diaminopropane (ap) and 2,9-dimethyl-1,10-phenanthroline (Me2-phen). Based on the elemental analyses, spectroscopic studies, magnetic moments (at room temperature) and molar conductivity measurements, extended oxamido-bridged structures consisting of a copper(Ⅱ) and an iron(Ⅱ) ions, which have a square planar environment and an octahedral environment, respectively, are proposed for these complexes. Complexes [Cu(oxap)Fe(en)2]SO4 (1) and [Cu(oxap)Fe(pn)2]SO4 (2) have been characterized by variable temperature magnetic susceptibility (4.2~300 K) and the observed data were least-squares fitted to the susceptibility equation derived from the spin Hamiltonian including single-ion zero-field interaction for the iron(Ⅱ) ion, H=-2JS1.S2-DSzl2, giving the exchange integrals J=-21.9 cm-1 for 1 and J=-23.6 cm-1 for 2. These results are commensurate with antiferromagnetic interactions between adjacent metal ions within each molecule.展开更多
ine heterobinuclear complexes of Cu (Ⅱ)-RE (Ⅲ) with N, N′-bis-(3-car-boxylsalicylidene ) trimetliylenediamine (TS) were syntliesized and characterized bymeans of elemental analyses, molar conductivity, thermogravim...ine heterobinuclear complexes of Cu (Ⅱ)-RE (Ⅲ) with N, N′-bis-(3-car-boxylsalicylidene ) trimetliylenediamine (TS) were syntliesized and characterized bymeans of elemental analyses, molar conductivity, thermogravimetry,IR and elec-tronic spectra. The measurements of variable-temperature magnetic susceptibilitysliow that there exists only a very weak antiferromagnetic spin exchange interactionbetween the ions of Cut(Ⅱ) and RE(Ⅲ) in CuRETSCI . 3H_2O.展开更多
合成了二亚乙基三胺(dien)和咪唑为配体的两个铜(Ⅱ)单核配合物[(dien)Cu](ClO4)2[、(dien)Cu imH](ClO4)2和一个非对称性的咪唑桥联铜锌异双核配合物[(dien)Cu im Zn(tren)](ClO4)3,用元素分析、摩尔电导、反射光谱及磁化率测定对配合...合成了二亚乙基三胺(dien)和咪唑为配体的两个铜(Ⅱ)单核配合物[(dien)Cu](ClO4)2[、(dien)Cu imH](ClO4)2和一个非对称性的咪唑桥联铜锌异双核配合物[(dien)Cu im Zn(tren)](ClO4)3,用元素分析、摩尔电导、反射光谱及磁化率测定对配合物的组成和结构进行了表征。采用循环伏安法分别研究了配合物在乙腈和水溶液中的电化学性质,研究表明,Zn(Ⅱ)能通过咪唑桥改变Cu(Ⅱ)接受电子的能力,增强催化歧化超氧离子的活性。在水溶液中咪唑桥异双核配合物不很稳定,部分从Zn(Ⅱ)端断裂。展开更多
合成了2,2′,2″-三氨基乙基胺(tren)Schiff碱和咪唑为配体的2个铜(Ⅱ)单核配合物[(tren)Cu](ClO4)2、[(tren)Cu-imH](ClO4)2,以及一个对称性的咪唑桥联铜锌异双核配合物[(tren)Cu im Zn(tren)](ClO4)3,用元素分析、摩尔电导、反射光谱...合成了2,2′,2″-三氨基乙基胺(tren)Schiff碱和咪唑为配体的2个铜(Ⅱ)单核配合物[(tren)Cu](ClO4)2、[(tren)Cu-imH](ClO4)2,以及一个对称性的咪唑桥联铜锌异双核配合物[(tren)Cu im Zn(tren)](ClO4)3,用元素分析、摩尔电导、反射光谱及磁化率测定对配合物的组成和结构进行了表征。采用循环伏安法分别研究了配合物在乙腈和水溶液中的电化学性质,研究表明:Zn(Ⅱ)能通过咪唑桥改变Cu(Ⅱ)接受电子的能力。在水溶液中咪唑桥异双核配合物较稳定,未发生断裂。展开更多
This paper reports the synthesis,properties and crystal structure of the title model compound with the ESR parameters g_∥ =2.007,g_⊥=2.191, A_∥=0.0061 cm^(-1), and A_⊥=0.0114 cm^(-1). The crystal belongs to space ...This paper reports the synthesis,properties and crystal structure of the title model compound with the ESR parameters g_∥ =2.007,g_⊥=2.191, A_∥=0.0061 cm^(-1), and A_⊥=0.0114 cm^(-1). The crystal belongs to space group C_2~2-P2_1,a=8.924(2),b=11.590(4), c=16.356(6),β =91.40(2)°,Z=2.Cu(Ⅱ) and Zn(Ⅱ) are bridged by the imidazolate ring, with the distance of 5.84.The conductivity and electronic reflectance spectrum of the complex are described.pH dependence in an aqueous solution is also investigated by potentiometric titration, and fitted by a self-written computer program. The results indicate that the imidazolate bridge splits at the side facing Zn(Ⅱ) below pH 8.展开更多
基金Project supported by the Natural Science Foundation of shandong Province and the National Natural Science Foundation of China.
文摘Four new u-oxamido heterobinuclear complexes have been synthesized and identified as [Cu(oxap)Fe(L)2]SO4, where oxap denotes the N, N'-bis(2-aminopropyl)oxamido dianion and L represents diaminoethane (en); 1,3-diaminopropane (pn); 1,2-diaminopropane (ap) and 2,9-dimethyl-1,10-phenanthroline (Me2-phen). Based on the elemental analyses, spectroscopic studies, magnetic moments (at room temperature) and molar conductivity measurements, extended oxamido-bridged structures consisting of a copper(Ⅱ) and an iron(Ⅱ) ions, which have a square planar environment and an octahedral environment, respectively, are proposed for these complexes. Complexes [Cu(oxap)Fe(en)2]SO4 (1) and [Cu(oxap)Fe(pn)2]SO4 (2) have been characterized by variable temperature magnetic susceptibility (4.2~300 K) and the observed data were least-squares fitted to the susceptibility equation derived from the spin Hamiltonian including single-ion zero-field interaction for the iron(Ⅱ) ion, H=-2JS1.S2-DSzl2, giving the exchange integrals J=-21.9 cm-1 for 1 and J=-23.6 cm-1 for 2. These results are commensurate with antiferromagnetic interactions between adjacent metal ions within each molecule.
文摘ine heterobinuclear complexes of Cu (Ⅱ)-RE (Ⅲ) with N, N′-bis-(3-car-boxylsalicylidene ) trimetliylenediamine (TS) were syntliesized and characterized bymeans of elemental analyses, molar conductivity, thermogravimetry,IR and elec-tronic spectra. The measurements of variable-temperature magnetic susceptibilitysliow that there exists only a very weak antiferromagnetic spin exchange interactionbetween the ions of Cut(Ⅱ) and RE(Ⅲ) in CuRETSCI . 3H_2O.
文摘合成了二亚乙基三胺(dien)和咪唑为配体的两个铜(Ⅱ)单核配合物[(dien)Cu](ClO4)2[、(dien)Cu imH](ClO4)2和一个非对称性的咪唑桥联铜锌异双核配合物[(dien)Cu im Zn(tren)](ClO4)3,用元素分析、摩尔电导、反射光谱及磁化率测定对配合物的组成和结构进行了表征。采用循环伏安法分别研究了配合物在乙腈和水溶液中的电化学性质,研究表明,Zn(Ⅱ)能通过咪唑桥改变Cu(Ⅱ)接受电子的能力,增强催化歧化超氧离子的活性。在水溶液中咪唑桥异双核配合物不很稳定,部分从Zn(Ⅱ)端断裂。
文摘合成了2,2′,2″-三氨基乙基胺(tren)Schiff碱和咪唑为配体的2个铜(Ⅱ)单核配合物[(tren)Cu](ClO4)2、[(tren)Cu-imH](ClO4)2,以及一个对称性的咪唑桥联铜锌异双核配合物[(tren)Cu im Zn(tren)](ClO4)3,用元素分析、摩尔电导、反射光谱及磁化率测定对配合物的组成和结构进行了表征。采用循环伏安法分别研究了配合物在乙腈和水溶液中的电化学性质,研究表明:Zn(Ⅱ)能通过咪唑桥改变Cu(Ⅱ)接受电子的能力。在水溶液中咪唑桥异双核配合物较稳定,未发生断裂。
基金Project supported by the National Natural Science Foundation of China.
文摘This paper reports the synthesis,properties and crystal structure of the title model compound with the ESR parameters g_∥ =2.007,g_⊥=2.191, A_∥=0.0061 cm^(-1), and A_⊥=0.0114 cm^(-1). The crystal belongs to space group C_2~2-P2_1,a=8.924(2),b=11.590(4), c=16.356(6),β =91.40(2)°,Z=2.Cu(Ⅱ) and Zn(Ⅱ) are bridged by the imidazolate ring, with the distance of 5.84.The conductivity and electronic reflectance spectrum of the complex are described.pH dependence in an aqueous solution is also investigated by potentiometric titration, and fitted by a self-written computer program. The results indicate that the imidazolate bridge splits at the side facing Zn(Ⅱ) below pH 8.
