Triplet-state energies and substituent effects of excited aroyl compounds in the gas phase.
Triplet-state energy values obtained from the gas phase are still scarce. In this study, the triplet-state energies of 58 aroyl compounds, introduced as gas chromatographic peaks at atmospheric pressure and typically 473 K, have been determined from the 0-0 bands of their n --> pi* type phosphorescence spectra in excited nitrogen. Correlations of those gas-phase triplet-state energies with Hammett constants could be observed for substituted acetophenones, benzaldehydes and benzophenones.
Lin
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Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada. linz@dfo-mpo.gc.ca
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D000098:Acetophenones / Q000737:chemistry*; D000873:Anthracenes / Q000737:chemistry*; D000880:Anthraquinones / Q000737:chemistry*; D001547:Benzaldehydes / Q000737:chemistry*; D001577:Benzophenones / Q000737:chemistry*; D005740:Gases; D049449:Luminescence; D013057:Spectrum Analysis; D014966:Xanthenes / Q000737:chemistry*; D044004:Xanthones; D000095322:Anthrones
D000098:Acetophenones; D000873:Anthracenes; D000880:Anthraquinones; D001547:Benzaldehydes; D001577:Benzophenones; D005740:Gases; D014966:Xanthenes; D044004:Xanthones; C047723:benzophenone; C009689:xanthone; C004522:anthrone; D000095322:Anthrones; C093383:3-methylbenzaldehyde; C038699:acetophenone; C032175:benzaldehyde