Abstract
Abstract The thermodynamic parameters for the interactions of Et2SnCl2 and Bu2SnCl2 with para-substituted meso-tetraphenylporphyrins (H2T(4-X)PP; X = OCH3, CH3, H, Cl) were determined. The overall formation constants K (mol-2 dm6), where (K = K1×K2), were calculated by using UV–vis spectrophotometry titration, and a data refinement was carried out with a computer program, SQUAD. The adducts had a 2 : 1 composition of R2SnCl2 to porphyrin. The overall formation constants decreased with decreasing electron releasing of porphyrins and increasing steric hindrance on an organotin compound, as follow: H2T(4-CH3O)PP > H2T(4-CH3)PP > H2TPP > H2T(4-Cl)PP and Et2SnCl2 > Bu2SnCl2.
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