Crown-ether styryl dyes .20. Synthesis, spectral properties, and complex formation of photochromic dyes based on 15-crown-5-substituted benzothiazoleстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Novel crown-containing styryl dyes (CSD) based on 15-crown-5-substituted benzothiazole with various electron-donating groups in the para-position 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 parameters and the magnitudes and directions of the shifts of absorption (fluorescence) maxima, the effects of substituents and complex formation on the photochromism of CSD were elucidated. 000 Using quantum-chemical calculations, the possibility of controlling the degree of participation of either of the two chromophores in the long-wave electron transition by complex formation was analyzed.