Effect of the complex forming ion on the physicochemical characteristics of solvation of tetraphenylporphine complexes

Abstract

The enthalpies of dissolution, transfer, and axial coordination for the Cd(II), Co(II), Mn(III), Fe(III), and Cr(III) complexes of tetraphenylporphine, H2(TPP), in nonpolar (C6H6, CCl4) and electron-donating solvents (DMF, DMSO, Py,c-C5H10NH) have been determined calorimetrically at 298.15 K. On the basis of thermogravimetrical data for the corresponding crystallosolvates the composition, thermal stability, and energy of intermolecular interaction of the metal-porphine complexes with pyridine have been calculated. Complexing in noncoordinating solvents brings about no radical change in the physicochemical characteristics of axial coordination which depend critically on the electron structure of the complex-forming metal.