Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Derivatographic Studies on Transition Metal Complexes. VI. Thermal, cis, trans-to-cis, cis Exchange-Isomerization of [CoCl2(NH3)2en]SCN·H2O in Solid Phase
Ryokichi TsuchiyaMasatatsu SuzukiEishin Kyuno
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1971 Volume 44 Issue 3 Pages 709-712


The exchange-isomerization of the complex, cis(dichloro), trans(diammine)-[CoCl2(NH3)2en]SCN·H2O to cis(chloro isothiocyanato), cis(diammine)-[CoCl(NCS)(NH3)2en]Cl, was investigated by means of both derivatographic and isothermal methods. The reaction took place immediately after the liberation of crystalline water. The thermochemical functions were obtained to be ΔH=(5.5±1.0) kcal/mol and E=(22.8±2.0) kcal/mol for the dehydration, while those for the exchange-isomerization were ΔH=(4.8±1.0) kcal/mol and E=(62.3±3.0) kcal/mol, respectively. As a probable reaction mechanism for the exchange-isomerization, a certain seven coordinated intermediate in the reaction pathway was introduced.

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