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The interactions of free base porphyrins with tetracyanoethylene and 2,3-dichloro-5,6-dicyanobezoquinone as acceptors result in charge-transfer adducts of composition 2:1 of acceptor to donor, [(acceptor) 2 (donor)]. Formation constants, K , as well as the thermodynamic parameters, Δ H °, Δ S °, and Δ G ° were determined by UV-Vis titration method for the adducts. Surprisingly, the values of D S o n 0 and D H o n 0 for TCNE are in contrast to ΔH° a 0 and ΔS° a 0 for DDQ. Negative values of D G o make these interactions favorable in the both cases. KEY WORDS: DDQ, TCNE, Free base porphyrin, Thermodynamic properties Bull. Chem. Soc. Ethiop. 2011 , 25(1), 127-136.

<b>Comparison of acceptor properties for interaction of TCNE and DDQ with some free base porphyrins</b>