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Abstract
Abstract— The spectroscopy and photochemistry of brilliant green leucocyanide 1a were investigated at room and low temperature, in polar and nonpolar solvents. At 77 K, 1a exhibits solvent independent absorption, fluorescence (φf= 0.1), and phosphorescence (φp= 0.5). Solvent effects become important at room temperature; in polar solvents, φf, decreases and photodissociation yielding brilliant green dye 3 occurs [φdis,(EtOH) ˜0.91. 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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