Spectrophotometric studies of the thermodynamics of sitting-atop complexation between free base meso-tetraarylporphyrins and titanium(IV) chloride |
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| Authors: | Hossein Dehghani Elham Jafari Mohammad Reza Mansournia Fatemeh Behnoudnia |
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| Institution: | aDepartment of Chemistry, Faculty of Science, University of Kashan, Kashan, 87317-51167, Islamic Republic of Iran;bDepartment of Chemistry, Islamic Azad University, Firoozabad Branch, Islamic Republic of Iran |
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| Abstract: | Titanium(IV) chloride reacts with free base meso-tetraarylporphyrin and its ortho, meta and para-substituted derivatives (H2T(X)PP; X: OCH3, CH3 and Cl) for formation of sitting-atop (SAT) complexes, TiCl4(H2T(X)PP)]. The computer fitting of the variation of the absorbance versus mole ratio by KINFIT program was used for calculation of the formation constants of these complexes in chloroform. Thermodynamic parameters, ΔG°, ΔH°, ΔS°, have been determined and the influence of the temperature and the substituted aryl groups (electronic and steric effects) in the free base porphyrins on the stability of the SAT complexes was studied. |
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| Keywords: | Spectrophotometric study Thermodynamic Formation constant Porphyrin Sitting-atop SAT TiCl4 |
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