The relationship between the structure of Cu(II) complexes and their chemical transformations: VI

Abstract

Data on the activation energies of dehydration of the complexes [Cu(en)2(H2O)]X2, [Cu(α, α′-bipy)2(H2O)]S2O6 and [Cu(o-phen)2(H2O)]X2 were gained by means of dynamic TG, and theΔH values of the same reactions by DSC. The results were correlated with known data on the crystal structures of the studied complexes. No significant differences betweenE and/orΔH values were found for tetragonal pyramidal and trigonal bipyramidal complexes. For complexes with sufficiently exactly solved crystal structures, the activation energies increase with decreasing values of the anisotropic temperature factors (in the Cu-OH2 bond directions). Activation energy values are also influenced by the type of structural changes accompanying the formation of the intermediate of thermal decomposition.