Abstract
The apparent equilibrium constants ( K AD ) and reaction enthalpies (Δ H 0) of the formation of charge transfer (C-T) complexes between some pyridine and purine derivatives with substituted phenolic structures at different pH values are reported, as derived from spectroscopic and/or calorimetric measurements. A comparative analysis of the two sets of data obtained from the two experimental approaches is presented, and the relevance of the two techniques in the study of weak interactions is discussed. Some qualitative correlations between the extent of association and structural features of the interacting molecules may be drawn from the trend of K AD values.
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