Tetraphenylporphine zinc(II) coordination with primary amines and alcohols in chloroform

Changes in the thermodynamic and kinetic parameters of isoequilibrium coordination of tetraphenylporphine zinc(II) (Zn-TPP) with primary amines in chloroform at 283–308 K follow expanded correlative Taft relation modified for amines. Dependences of stability constants of complexes on shifts of Zn-TPP absorption bands in electronic spectra caused by the reactions with primary amines and the corresponding alcohols are of a linear character, as well as the relations between rate constants of nucleophilic substitution and of complex formation. The formation of molecular complexes with certain amines is accompanied by the appearance of a new absorption band in the electronic spectra near 630 nm.