Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2000-01-01

Triplet-state energies and substituent effects of excited aroyl compounds in the gas phase.

Z P Lin, W A Aue

Index: Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 56A(1) , 111-7, (2000)

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Abstract

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.