Abstract
Linear dichroism (LD) absorption spectra of the title compound (Chrysazin, Danthron) have been recorded in the UV-VIS and IR regions using uniaxially stretched polyethylene as an anisotropic solvent. The LD results show that only three different transition moment directions are present in the observed ≈ 30 transitions. This indicates that the molecular symmetry of the compound in stretched polyethylene is C 2v (in contrast to C s in the stable crystal form) and allows an unambiguous symmetry classification of the observed electronic and vibrational states. The results lead to reassignment of at least three vibrational modes, including the asymmetric δ(OH) and δ(CO) in-plane bending modes that are of interest in the discussion of intramolecular hydrogen bonding effects.
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