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That's quite a switch! The ionization-induced switch in the preferred intermolecular binding motif of the phenol⋅⋅⋅Ar interaction from π bonding to hydrogen bonding (see picture) has been monitored in real time by time-resolved picosecond UV-UV-IR pump-probe spectroscopy. The timescale for this prototypical intermolecular hydrophobic→hydrophilic (π→H) isomerization process (10 ps) has been measured for the first time.
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Ishiuchi et al. (2005) studied this question.
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