A New Class of Organic Luminophores With a Stilbene Chromophore: 3-Phenylmethylene-1(3H)-Isobenzofuranones
Open Access
- 1 February 1983
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 38 (2) , 200-205
- https://doi.org/10.1515/zna-1983-0217
Abstract
A new class of luminophores with a stilbene chromophore, 3-phenylmethylene-1(3H)-iso-benzofuranones (BPH's), has been investigated. The fluorescence occurs in the region 26000-16000 cm-1, the maximal quantum yield being about 0.6. As a result of substitution or higher polarity of the solvent the ππ* state of the BPH's separates from the fluorescently inactive nπ* state. The S0-S2 absorption transition of the BPH's results from an excitation which is practically localized in the stilbene fragment. The good linear correlation of the fluorescence and absorption maxima and O-O transitions in ethanol with the σp-Hammett constants has been used for an interpretation of the changes in the potential hyperfaces of S0 and S1 states.Keywords
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