CROWN-ETHER STYRYL DYES .20. SYNTHESIS, SPECTRAL PROPERTIES, AND COMPLEX-FORMATION OF PHOTOCHROMIC DYES BASED ON 15-CROWN-5-SUBSTITUTED BENZOTHIAZOLE

Novel crown-containing styryl dyes (CSD) based on 15-crown-5-substitut ed benzothiazole with various electron-donating groups in the para-pos ition of the benzene ring were synthesized. Spectral and photochemical properties of cis- and trans-isomers of CSD and their complexes with Mg2+ ions in solutions were studied. By analysis of spectral parameter s and the magnitudes and directions of the shifts of absorption (fluor escence) maxima, the effects of substituents and complex formation on the photochromism of CSD were elucidated. 000 Using quantum-chemical c alculations, the possibility of controlling the degree of participatio n of either of the two chromophores in the long-wave electron transiti on by complex formation was analyzed.