INFLUENCE OF METAL-IONS ON PHOTOCHROMIC AND LUMINESCENT PROPERTIES OFSPIROPYRANS IN SOLUTIONS

The effect of complexation of indoline and phenanthridine spiropyrans with transition and rare-earth metal ions on photochromic, spectral-an d-kinetic, and luminescent properties of the spiropyrans in solutions was studied. The complex formation is accompanied by emergence of an a bsorption band shifted to shorter wavelengths by 80-120 nm relatively to that of the ring-opened form of spiropyran in the visible spectral region; increase in relaxation time of the ring-open forms; and appear ance of a fluorescence band shifted to shorter or longer wavelengths f or indoline or phenanthridine spiropyrans, respectively.