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 [CoⅢ Cl2(py)4][CoⅡ Cl3(py)][J]. Chinese Chemical Letters, ;1993, 4(1): 59-60.
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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 [CoⅢCl2(py)4]+ and an anion [CoⅡ Cl3(py)]-. The CoⅢ ion is coordinated by two Cl- and four pyridine nitrogen atoms to form an octahedral geometry, and CoⅡ 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 CoⅢ and CoⅡ ions.
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