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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