HIGH RESOLUTION ELECTRONIC SPECTRA OF 1,2-DIMETHOXYBENZENE AND THE 1,2-DIMETHOXYBENZENE/WATER $COMPLEX^{a}$

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 Title: HIGH RESOLUTION ELECTRONIC SPECTRA OF 1,2-DIMETHOXYBENZENE AND THE 1,2-DIMETHOXYBENZENE/WATER $COMPLEX^{a}$ Creators: Yi, John T.; Ribblett, Jason W.; Pratt, D. W. Issue Date: 1999 Publisher: Ohio State University Abstract: High resolution $S_{1} \leftarrow S_{0}$ fluorescence excitation spectra of 1,2-dimethoxybenzene (DMB) and its water complex have been obtained and analyzed. The derived values of the rotational constants show that DMB itself has a planar heavy-atom structure with trans-disposed methoxy groups in both electronic states. No evidence for any other conformational isomers was found. The water complex origin appears $127 cm^{-1}$ to the blue of the bare molecule origin and is split into two spectra separated by $0.04 cm^{-1}$. Analyses of these data show that the water molecule is attached via two $O-H \cdots O$ hydrogen bonds to the methoxy groups, and undergoes a hindered internal rotation. Differences in the nature of this motion in the two electronic states will be discussed. Description: $^{a}$ Work supported by NSF. Author Institution: Department of Chemistry, University of Pittsburgh URI: http://hdl.handle.net/1811/19604 Other Identifiers: 1999-WJ-10