Fluorescence probe for microenvironments: anomalous viscosity dependence of the fluorescence quantum yield of p-N,N-dialkylaminobenzylidenemalononitrile in 1-alkanols

Abstract The effect of solvent viscosity on the fluorescence quantum yield of p -N,N-dialkylaminobenzylidenemalononitrile has been studied in alcoholic solvents with viscosities ranging from 0.55 to 115 cP. The observed effect is shown to be a direct consequence of the molecular rotation of surrounding solvent molecules.

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