The formation constants and the enthalpies of formation of CH/π complexes were determined for a series of ternary chloroform/aromatic π-base/carbon tetrachloride (solvent) systems. The enthalpies showed that the interaction is favored by the electron-releasing substituent on the aromatic ring. Electronegative substituents on the CH donor also strengthen the interaction. The fact renders a support on the hydrogen-bond-like nature of the CH/π interaction.
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Ehama et al. (1993) studied this question.
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