The i.r., far i.r. and Raman spectra of the triclinic and monoclinic forms of the hydroquinone-p-benzoquinone 1:1 complex (quinhydrone) have been recorded and compared to the solution and vapour phase vibrational spectra of the components. The largest shifts have been observed on the characteristic vibrations of the hydroxyl and carbonyl groups which can be attributed to the OH · OC hydrogen bonds. The frequency changes of the ring stretching modes are negligible indicating that the charge transfer interaction is very weak. Correlation splitting has been observed only in the spectra of the monoclinic form, in accord with the result of factor group analysis. The disputed assignments of the bands in the 1700-1600 cm-1 range of the Raman spectrum of p-benzoquinone could be clarified by taking into account their shifts in the spectra of quinhydrone.
|Number of pages||9|
|Journal||Spectrochimica Acta Part A: Molecular Spectroscopy|
|Publication status||Published - 1989|
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