On the solvatochromic reversal of merocyanine dyes. Part 2.1 An experimental and semi-empirical study of the solvatochromism of α- and γ-vinylogous pyridones

Abstract

The vinylogous α-pyridone 1,2-dihydro-1-(4-methoxyphenyl)-2-(4-oxocyclohexa-2,4-dienylidene)-4,6- diphenylpyridine 3 was prepared and its solvatochromic behaviour in several solvents recorded and compared to that of its γ-isomer 1. The relative behaviour of these dyes, which differed from that of other solvatochromic vinylogous α/γ-pyridones, could be reproduced by a previously described theoretical model.

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