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Abstract. ESR measurements on 9, 10‐diphenylanthrace in solution show that the molecule is non‐planar, the two phenyl rings being twisted by about 66° relative to the anthracene nucleus. This agrees with previous predictions made on the basis of scale models. Evidence from absorption and fluorescence spectra for a change of angle between ground and excited state is examined, and a decrease of about 6° is found for the excited state. On the basis of the large angle of twist possible reasons are suggested for the difference between anthracene and 9, 10‐diphenylanthracne with regard to dimer formation and quantum yield of fluorescence in solution.