Solubility of Tetra(pyrid-3- and 4-yl)porphines and Their Complexes with d-Metals in Chloroform and Ethanol

The solubility of 5,10,15,20-tetra(pyrid-3- and 4-yl)porphine isomers and their coordination compounds with d-metals in the temperature range of 298–318 K is studied. Patterns of the dissolving of porphyrin ligands and the metal complexes they form with Co(II), Cu(II), and Zn(II) in chloroform and ethanol depending on the nature of the metal and the position of the nitrogen atom in the pyridyl substituent of the porphyrin molecule are discussed. The thermodynamic parameters of dissolution are calculated for the investigated compounds.