Abstract
Rotational coherence spectroscopy involving polarized, time-correlated single-photon counting techniques has been used to measure the excited-state structures of hydrogen-bonded complexes between PPD and water at the 1:1 and 1:2 levels of aggregation. Structure determinations involved comparison of measured and simulated RCS traces using the measured B and C rotational constants. PPD/(H 2O) 1 reveals a singly hydrogen-bonded, in-plane structure with an N…HO distance of 2.95±0.1 Å. The best structural estimate for the 1:2 complex, PPD/(H 2O) 2, consists of a water dimer, hydrogen bonded to one nitrogen atom of PPD.
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