Citation: Hao XU, Jin Yu LI, Zhong Zhi WU, Jian Zhong ZOU, Zheng XU, Xiao Zeng YOU, Zheng Chao DONG. SYNTHESIS, MAGNETIC PROPERTY AND X-RAY CRYSTAL STUCTURE OF MIXED VALENT COBALT COMPLEX SALT [Co^Ⅲ Cl₂(py)₄][Co^Ⅱ Cl₃(py)][J]. Chinese Chemical Letters, ;1993, 4(1): 59-60. shu

SYNTHESIS, MAGNETIC PROPERTY AND X-RAY CRYSTAL STUCTURE OF MIXED VALENT COBALT COMPLEX SALT [Co^Ⅲ Cl₂(py)₄][Co^Ⅱ Cl₃(py)]

1.
Coordination Chemistry Institute, Nanjing University, Nanjing 210008;
2.
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002

Received Date: 13 April 1992

Complex salt Co₂Cl₅(py)₅ (py=pyridine) was obtained by the reaction of CoCl₂·6H₂O with Bu₄NMnO₄ in pyridine in the presence of benzoic acid. It is monoclinic and crystallizes in space group P2₁/n, fw=690.64, a=28.652(5), b=14.108(4), c=7.424(3)Å;β=90.09(1); V=3001(2)Å³; Z=4, Dc=1.53g/cm³. Final R factor is 0.041. The structure consists of a discrete cation [Co^ⅢCl₂(py)₄]⁺ and an anion [Co^Ⅱ Cl₃(py)]^-. The Co^Ⅲ ion is coordinated by two Cl^- and four pyridine nitrogen atoms to form an octahedral geometry, and Co^Ⅱ is coordinated by three Cl^- and one pyridine nitrogen atom to form the apices of a tetrahedron. The variable-temperature magnetic susceptility measurement shows no magnet-exchange interaction between Co^Ⅲ and Co^Ⅱ ions.
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