Method of quenching electronic excitation of chromophore-containing organic molecules in photoactive

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(57) Abstract : The photostabilizing electronic excited state energy - particularly singlet state energy from a UV-absorbing molecule has been found to be readily transferred to (accepted by) -cyanodiphenylacrylate compounds of formulas (I) and (V) having an alkoxy radical preferably in the four (para) position (hereinafter methoxycrylenes) on one or both of the phenyl rings : (I) wherein at least one of R 1 and R 2 is a straight or branched chain C 1 -C 12 alkoxy radical, preferably C 1 -C 8 , more preferably C 1 -C 4 , and most referably methoxy, and any non-alkoxy radical R 1 or R 2 is hydrogen; and R 3 is a straight or branched chain C 1 -C 24 alkyl radical, preferably C 12 -C 24 , more preferably C o(lI); wherein A and B are the same or different and are selected from the group consisting of oxygen, amino and sulfur; R 1 and Rare the same or different and are selected from the group consisting Of C 1 -C 30 alkyl, C 2 -C alkylene, C 2 -C 30 alkyne, C 3 -C 8 cycloalkyl, C 1 -C 30 substituted alkylene, C 2 -C 30 substituted alkyne, aryl, substituted aryl, heteroaryl, heterocycloalkyl, substituted heteroaryl and substituted heterocycloalkyl; R is selected from the group consisting Of C 1 -C 30 alkyl, C 2 -C 30 alkylene, C 2 C 30 alkyne, CvC, cycloalkyl, C 1 -C 30 substituted alkyl, C 3 -Cs substituted cycloalkyl, C 1 -C 30 substituted alkylene, 4 5 6 7 C 2-C 30 substituted alkyne; R, R, R and R are the same or different and are selected from the group consisting of C 1 -C 30 alkoxy straight chin on branched and a, b, c and d are each either 0 or 1, and a, b, c and d add up to 1, 2, 3, or 4.