An influence of structural factors and surroundings features on both the spectral and enthalpy characteristics of dissolution and solvation processes and the thermodynamic stability of tetrakis(3,5-di-tert-butylphenyl)porphine (H2Р) and its coordination compounds with a number of d-metals have been studied in different solvents using spectroscopic and calorimetric methods. The contribution of π-π-interaction of H2Р ([МР]) - benzene to the solvation process was estimated. It have been shown that π-π-stacking interaction between aromatic systems of [МР] and benzene molecules is in the following sequence: [PdP]< [CdP]< [NiP]< [ZnP]< [CuP]< [AgP]< [CoP]. The stability of [МР] increases in the number of [HgP] < [CdP] < [ZnP] < [AgP] < [CuP] < [NiP] ≈ [CoP] < [PdP] which is in agreement with spectral criterion of strength. The coordinative unsaturation of metal porphyrins follows the sequence: [(Ac)FeP] < [NiP] < [PdP] < [CoP] << [CdР] <[ZnР] < [CuP] < [AgP] < [HgР] < [(Ac)MnР]
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