Lee, Ho-Hi, Kimura
Dec 1, 1999
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Abstract
Abstract Polymorphs I and II of phenylpyruvic acid are obtained as mixtures of both crystal forms or relatively pure crystals, from different solvents. Polymorph I is more stable than polymorph II at room temperature. Spectral characteristics of these polymorphs are discussed on the basis of IR, Raman and solid state 13 C NMR spectra. Also, the assignment of the IR features observed in the 1600–1700 cm −1 region is re-investigated by referring to the spectra of heavy-atom substituted derivatives. It is suggested that the CO stretching band is split by the crystal field for both polymorphs.