The thermodynamic studies of the molecular interactions of methyltin(IV) tribromide with free base meso-tetraarylporphyrins |
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Institution: | 1. Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75168, Iran;2. Faculty of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), 5195-1159, Zanjan 45195, Iran |
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Abstract: | The thermodynamic parameters for the interactions of MeSnBr3 with para- and meta-substituted meso-tetraphenylporphyrins (H2T(4-X)PP; X=OCH3, CH3, H, Cl, NO2 and H2T(3-X)PP; X=CH3, Cl) have been studied. The formation constants have been elucidated by using spectrophotometric titration and computer squad program data refinement. The adducts of composition 2:1 and 1:1 of MeSnBr3 to H2T(4-X)PP with stability constants K1 and K2 coexist in solution, but meta-substituted porphyrins form adducts of the composition 1:1 of MeSnBr3 to H2T(3-X)PP with stability constant K1. Formation constants decrease with decreasing electron donation of para-substituted porphyrins as follow: H2T(4-CH3O)PP>H2T(4-CH3)PP>H2TPP>H2T(4-Cl)PP>H2T(4-NO2)PP. Despite the electron donation of the methyl group, H2T(3-Cl)PP forms more stable adducts than H2T(3-CH3)PP with MeSnBr3. |
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