Glycine provided to research laboratories by chemical companies can contain different polymorphs and/or mixture of polymorphs. The alpha- and gamma-glycine differ slightly in 13C shielding parameters and very much in dynamic properties. The isotropic values of chemical shifts for carboxyl groups of
Low-temperature heat capacity of α and γ polymorphs of glycine
✍ Scribed by V. A. Drebushchak; Yu. A. Kovalevskaya; I. E. Paukov; E. V. Boldyreva
- Book ID
- 111560327
- Publisher
- Springer Netherlands
- Year
- 2003
- Tongue
- English
- Weight
- 108 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0022-5215
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## Abstract Crystallization of metastable α and stable γ polymorphs of glycine was carried out from aqueous solution in the presence of ammonia. Pure aqueous solution and solution with lower concentration of ammonia yield α nucleation and solution with a critical concentration of ammonia yield γ nu
## Abstract The effect of cooling down to 150 K on the structures of __α__- (s.g. __P__2~1~/__n__), __β__- (s.g. __P__2~1~), and __γ__- (s.g. __P__3~1~) polymorphs of glycine was studied by X-ray single-crystal diffraction. No polymorphic transformations were detected. Relative volume changes and t