Abstract

Abstract The interactions of tetracyanoethylene (TCNE) with 4-substituted meso-tetraphenylporphyrins (H2T(4-X)PP) results adducts of composition 2:1 of TCNE to H2T(4-X)PP, [(TCNE)2H2T(4-X)PP)]. Formation constants, K, as well as other thermodynamic parameters, ΔH°, ΔS°, and ΔG° of adducts were determined by UV–vis titration method. Adducts have positive values of ΔS° and ΔH°. These interactions are favorable with considerable negative values of ΔG°. Adducts stabilities are in the order: H2T(4-OCH3)PP > H2T(4-CH3)PP > H2TPP > H2T(4-Cl)PP.

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