Spectrophotometric Studies of the Thermodynamics of Molecular Complexation between Free Base Meso-Tetraarylporphyrins and Iodine(III) Chloride

Authorsحسین دهقانی قربی,فاطمه بهنودنیا,محمد رضا منصور نیا,سیده سارا بخشایش
JournalJournal of Solution Chemistry
Page number771
Volume number38
IFثبت نشده
Paper TypeFull Paper
Published At2009-04-11
Journal GradeScientific - research
Journal TypeElectronic
Journal CountryIran, Islamic Republic Of
Journal IndexSCOPUS ,JCR

Abstract

A spectrophotometric method was used for the molecular complexation of ICl3 with para-substituted meso-tetraarylporphyrins (H2t(4-X)pp; X: OCH3, CH(CH3 )2, CH3, H and Cl) in methanol/chloroform (2.5% v/v) solution. The equilibrium constants and the thermodynamic parameters were measured spectrophotometrically at various temperatures for 1:1 molecular complex formation of meso-tetraarylporphyrins as electron donors with ICl3 as the electron acceptor. The formation constants for the molecular complexes change according to the following trend: [ICl3(H2t(4-OCH3)pp)] > [ICl3(H2t(4-CH(CH3)2)pp)] > [ICl3(H2t(4-CH3)pp)] > [ICl3(H2tpp)] > ([ICl3(H2t(4-Cl)pp)]. Further, the thermodynamic parameters, Go,Ho and So, for formation of the complexes were obtained.

tags: Porphyrin, Iodine(III) chloride, Molecular complex, Donor, Acceptor, Deformation