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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 77.degree. 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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