Fluorescent Properties of Polymer Systems with Negative Photochromism Based on Complexes of Spiropyran with Metal Ions

A spectral-kinetic investigation was carried out to study the fluorescent properties of complexes of molecules of photochromic nitro-substituted spiropyran with metal cations differing in electron affinity in polymer matrices of various nature. It is shown that the photoinduced dynamic color change is determined by the change not only in the absorption, but also in the luminescence of complexes exhibiting negative photochromism. The role of proton complexes in the photochromic transformations of the merocyanine form of spiropyran was revealed.