A spectral-kinetic investigation of the negative photochromism of systems based on complexes of spiropyrans with metal ions

Abstract

A comparative spectral-kinetic study of the negative photochromism of complexes of molecules of nitrosubstituted indoline spiropyrans with metal ions in solutions and polymer matrices is carried out. The possibility of creating polymer coatings with negative photochromism, based on the complexes of spiropyran molecules with metal ions is shown for the first time. It is determined that the efficiency of photochromic transformations of complexes depends on the nature of the polymer binder, the component composition of the polymer film, and the properties of metal cations. During the storage of photochromic polymer films in the dark, a spectral manifestation of the transformation of metal complexes into putative protonated complexes is revealed. It is found that the stability of the complexes is determined by the nature of the polymer binder and the affinity of the metal cations to an electron.