Thermodynamic Studies of the Molecular Interactions of 2,4-Dichlorophenol and 2,4,6-Trichlorophenol with Free Bases meso-Tetraarylporphyrins

Abstract

The hydrogen bonded complexes of 2,4-dichlorophenol (2,4- DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) with free base mesotetraarylporphyrins [H₂T(4-X)PP] (X = OCH₃, CH₃, H, Cl) have been studied. The formation constants K and other thermodynamic parameters were calculated by UV-Vis spectrophotometry titration method. The formation constants show the following trend relative to X substituent of porphyrins: H₂T(4-CH₃O)PP > H₂T(4-CH₃)PP > H₂TPP > H₂T(4-Cl)PP On the other hand, formation constants show that 2,4-DCP form more stable hydrogen bonded complexes than 2,4,6-TCP with free base porphyrins.