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Citation: JING Zhi-Hong, LI Yan-Tan, LIAO Dai-Zheng. Synthesis and Magnetic Properties of μ-Terephthalato Binuclear Chromium(Ⅲ) Complexes[J]. Chinese Journal of Applied Chemistry, ;2001, 18(2): 100-103. shu

Synthesis and Magnetic Properties of μ-Terephthalato Binuclear Chromium(Ⅲ) Complexes

1.
a Department of Chemistry, Qufu Normal University, Qufu 273165;
2.
b Department of Chemistry, Nankai University, Tianjin

Received Date: 10 April 2000
Available Online: 19 July 2000
Fund Project: 国家自然科学基金(29631040) (29631040)山东省青年自然科学基金(Q99B12)资助课题 (Q99B12)

Three new terephthalato-bridged binuclear chromium(Ⅲ) complexes with the formula[Cr₂(TPHA)L₄](NO₃)₄, where L stands for 4,4'-dimethyl-2,2'-bipyridine(Me₂bpy); 2,9-dimethyl-1,10-phenanthroline(Me₂ phen) and 5-chloro-1,10-phenanthroline(Clphen), repectively and TPHA respresents the terephthalate dianions, have been synthesized and characterized. Based on the elemental analyses, molar conductance and magnetic moments measurements, and spectroscopic studies, extended TPHA-bridged structures consisting of two chromium(Ⅲ) ions, each in an octahedral environment are proposed for these complexes. The variable temperature magnetic susceptibility of was determined at 4~300 K[Cr₂(TPHA)(Me₂ bpy)₄](NO₃)₄ and the obtained data were simulated by the least square fitting and the equation based on the spin Hamiltonian operator,Ĥ=-2JŜ₁Ŝ₂, where the exchange integral J=-2.98 cm^-1. The result indicates the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions in the binuclear complex.
- terephthalato,
- binuclear chromium(Ⅱ) complexes,
- synthesis,
- magnetic property
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