title: High resolution electronic spectra of anisole and anisole-water in the gas phase: hydrogen bond switching in the S1 state.
abstract: Rotationally resolved S(1)<--S(0) electronic spectra of anisole and its hydrogen bonded complex containing one water molecule have been obtained. The results provide evidence for an "in-plane" complex in which the water molecule is attached via two hydrogen bonds to the anisole molecule, a donor O-H- - -O(CH(3)) bond and an acceptor H-O- - -H(ring) bond. Analysis of the subbands that appear in the spectrum of the complex suggests that hydrogen bond "switching" occurs when the complex absorbs light. The former O-H- - -O(CH(3)) bond is stronger in the ground (S(0)) state, whereas the latter H-O- - -H(ring) bond is stronger in the excited (S(1)) state. Dynamical consequences of this phenomenon are discussed.
authors.affiliation: Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: J W
authors.initials: JW
authors.lastname: Ribblett
authors.forename: W E
authors.initials: WE
authors.lastname: Sinclair
authors.forename: D R
authors.initials: DR
authors.lastname: Borst
authors.forename: J T
authors.initials: JT
authors.lastname: Yi
authors.forename: D W
authors.initials: DW
authors.lastname: Pratt