Competitive solvation of K+ by benzene and water: Cation-π interactions and π-hydrogen bonds

The competition between ion–molecule and hydrogen bond interactions in K+(benzene)1–5(water)1,2 is examined using infrared spectroscopic and mass spectrometric methods. The cation-π interaction and π-hydrogen bond play an important role in the structure of the mixed cluster ions. Important observations include: the preferential binding of benzene vs water to K+; the “dehydration” of the potassium ion by benzene; and the observation of water acting as a double proton donor with π-hydrogen bonds to two benzenes.

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