Abstract
Retinoic acid (vitamin A acid) in acetonitrile shows a very weak fluorescence which originates from the lowest-energy ππ* singlet of the polyene chain. In the presence of several metal salts, Hg(acetate)2, Ag(CF3COO) and ZnCl2, this fluorescence undergoes a slight spectral shift and becomes much more intense. The reason is not quite clear, but different effects may cause this fluorescence enhancement, e.g. energy increase of the non-emissive nπ* state by coordination at the carboxylic group, metal–olefin coordination and an increase of rigidity by organized structures.
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