Photochromic dihetarylethenes

…, DL Dzhavadov, LG Vorontsova, ZA Starikova…

Index: Krayushkin; Kalik; Dzhavadov; Vorontsova; Starikova; Martynkin; Ivanov; Uzhinov Russian Chemical Bulletin, 2000 ,  vol. 49,  # 10  p. 1757 - 1762

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Abstract

Abstract A series of new photochromic compounds were obtained for the first time from 1, 2- bis (2-ethylthio-3-thienyl) perfluorocyclopentene by substituting bromine atoms or carboxy, alkoxycarbonyl, and carbamoyl groups for hydrogen atoms in positions 4 and 4′. Introduction of these substituents causes a slight bathochromic shift (by 20–30 nm) of a long- wavelength absorption band for the cyclic form and significantly increases the quantum ...