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Tri aryl ethane dye photo chromism spectroscopy and photochemistry of brilliant green leuco cyanide

, : Tri aryl ethane dye photo chromism spectroscopy and photochemistry of brilliant green leuco cyanide. Photochemistry and Photobiology 25(1): 15-20

The spectroscopy and photochemistry of brilliant green leucocyanide, 1a were investigated at room and low temperature, in polar and nonpolar solvents. At K, 1a exhibits solvent independent absorption, fluorescence (.vphi.f = 0.1), and phosphorescence (.vphi.p = 0.5). Solvent effects become important at room temperature; in polar solvents, .vphi.f decreases, and photodissociation yielding brilliant green dye 3 occurs [.vphi.dis(EtOH) .apprx. 0.9]. Dye formation and 1a fluorescence can be quenched by 0.1 M crotononitrile. Attempts to sensitize dye formation with triplet sensitizers were unsuccessful. The spectroscopy of 3 was also examined.

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