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Langhals, Heinz and Demmig, Stefan and Huber, Helmut (1988): Rotational barriers in perylene fluorescent dyes. In: Spectrochimica Acta Part A: Molecular Spectroscopy, Vol. 44, No. 11: pp. 1189-1193
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Abstract

Rotational barriers in N-substituted perylene dyes have been determined. Phenyl substituents with tert-butyl groups in the o-position give rigid systems, whereas secondary alkyl groups cause low rotational barriers. In spite of that, fluorescent quantum yields are high in both cases. Conformations in solution are discussed.