Infrared and Raman spectroscopic study of molecular interactions in quinhydrone crystals

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Abstract

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.

Original languageEnglish
Pages (from-to)421-429
Number of pages9
JournalSpectrochimica Acta Part A: Molecular Spectroscopy
Volume45
Issue number4
DOIs
Publication statusPublished - 1989

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Molecular interactions
Raman scattering
Infrared radiation
Crystals
Vibrational spectra
Stretching
Charge transfer
Hydrogen bonds
Vapors

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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title = "Infrared and Raman spectroscopic study of molecular interactions in quinhydrone crystals",
abstract = "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.",
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AB - 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.

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