Thermal properties of [Co(en)Cl]Cl in solid state. Cis- trans isomerization of the [Co(en)Cl] complex ion in methanol.

Thermal decompositions of the trans-[Co(en)Cl]Cl and cis-[Co(en)Cl]Cl complex isomers have been studied using the TG-FTIR and TG-DSC-MS techniques. The measurements were carried out in argon atmosphere over the temperature range 293-873 K. The influence of the configurational geometry on the pathways of thermal transformations was discussed. Furthermore, kinetic studies on the reaction of the cis- trans isomerization of the [Co(en)Cl]Cl complex salt in methanolic solutions were performed using UV-Vis spectrophotometry at five temperatures in the 293-313 K temperature range. The observed rate constants were computed using the 'Glint' program based on the global analysis. It has been found that the cis- trans isomerization of [Co(en)Cl]Cl is a first order reaction. Furthermore, the cis/trans [Co(en)Cl]Cl isomerization proceeds according to the dissociative mechanism. [ABSTRACT FROM AUTHOR]