NONISOTHERMAL SPECTROPHOTOMETRIC KINETICS APPLIED TO INORGANIC REACTIONS

Kinetic constants and activation parameters of some inorganic reaction s in solution have been obtained very easily and with great accuracy f rom variable temperature spectrophotometric kinetic data using a metho d based on non-isothermal analysis. The reactions studied under variou s experimental conditions to test the method were the cis-trans isomer ization of the cation [Pt(PEt3)2(CH3)(C2H5OH)]+ in ethanol and the the rmal decomposition of the alkyl solvent species trans-[Pt(PEt3)2(n-C4H 9)(CH3OH)]+ to yield the trans-hydride [Pt(PEt3)2(H)(CH3OH)]+ in metha nol. The results are compared with those obtained by the traditional i sothermal method. A suitable experimental apparatus and software is de scribed for routine measurements.