Polymorphism of phenylpyruvic acid studied by IR, Raman and solid state C NMR spectroscopy |
| |
| Authors: | Ho-Hi Lee Kouji Kimura Takatomo Takai Hitoshi Senda Akio kuwae Kazuhiko Hanai |
| |
| Affiliation: | a Department of Chemistry and Chemical Engineering, Faculty of Technology, Kanazawa University, Kakuma-machi, Kanazawa 920, Japan;b Institute of Natural Sciences, Nagoya City University, Mizuho-ku, Nagoya 467, Japan;c Gifu Pharmaceutical University, Mitahora-higashi, Gifu 502, Japan |
| |
| 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 13C 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 C=O stretching band is split by the crystal field for both polymorphs. |
| |
| Keywords: | Polymorphism Phenylpyruvic acid Solid state 13C NMR spectroscopy Crystal field |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
