Abstract
Abstract Spectrophotometric study was applied to the interaction of SbF3 with para-, meta-, and ortho-substituted meso-tetraarylporphyrins (H2t(Xp)p; X: H, OCH3, CH3, and Cl) in CHCl3. The 1:1 formation constants of the resulting complexes were calculated at several temperatures by the computer fitting of absorbances of solutions versus mole ratio data with appropriate equations. Thermodynamic parameters (ΔG0, ΔH0, and ΔS0) have been determined and the influence of electron donation and steric effect of the substituted aryl groups in the free base porphyrins on the stability of the complexes is discussed.
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