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Citation: Miao Mingming, Sun Xianru, Shi Jingmin, Liao Daizheng, Jiang Zonghui, Wang Genglin. Synthesis and Magnetism of Tetrabromophthalato-Bridged Cobalt(Ⅱ) Binuclear Complexes[J]. Chinese Journal of Applied Chemistry, ;1996, 13(1): 43-46. shu

Synthesis and Magnetism of Tetrabromophthalato-Bridged Cobalt(Ⅱ) Binuclear Complexes

1.
Department of Chemistry, Nankai University, Tianjin 300071

Received Date: 19 April 1995
Available Online: 22 August 1995
Fund Project:

Four novel cobalt(Ⅱ) complexes have been synthesized and characterized,namely[Co₂(4Br^-PHTH)(L)₄](ClO₄)₂(L denotes 1,10-phenanthroline(phen)(1),5-nitro-1,10-phenanthroline(NO₂-phen) (2),2,2'-bipyridyl(bpy)(3) and 4,4'-dimethyl-2,2'-bipyridyl(Me₂bpy)(4),respectively),where 4Br^-PHTH is the tetrabromophthalate anion. Based on IR,elemental analysis and conductivity measurements,these complexes are proposed to have extended tetrabromophthalato-bridged structure consisting of two cobalt ions in which each cobalt(Ⅱ) ion has a distorted octahedral environment.The temperature dependence of the magnetic susceptibility for all the complexes were measured over the range 75~300 K and the observed data were successfully simulated by an equation based on the spin Hamiltonian operator(Ĥ=-2JŜ₁·Ŝ₂),giving the exchange integral J=-0.87 cm^-1,J=-0.84cm^-1(2),J=-0.82 cm^-1(3) and J=-0.85 cm^-1(4).These results indicate the existence of weak antiferromagnetic spin exchange interaction between the metal ions.
- binuclear complex,
- Co(Ⅱ)-Co(Ⅱ),
- antiferromagnetic interaction
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