Lowest excited states of aza-analogues of stilbene. INDO/S calculation

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Abstract
The lowest excited states of styrylpyridines, dipyridylethylenes and of their conjugated acids have been studied by an INDO/S method. In these compounds the lowest excited states are of a ππ* nature, the nπ* states lying slightly above them. On the basis of these calculations the initial steps in the photophysical deactivation processes are discussed.