期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 8, 页码 2030-2034出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201610977
关键词
amino acids; crystal structures; glycine; phase transitions; X-ray diffraction
资金
- National Nuclear Security Administration under Stewardship Science Academic Alliances program through DOE [DE-NA0001982]
- Materials Research Science and Engineering Center (MRSEC) program of the National Science Foundation (NSF) [DMR-0820341, DMR-1420073]
- DOE-BES [DE-AC02-98CH10086]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
Glycine, the simplest amino acid, is also the most polymorphous. Herein, we report the structure determination of a long unknown phase of glycine, which was first reported by Pyne and Suryanarayanan in 2001. To date, this phase has only been prepared at 208K as nanocrystals within ice. Through computational crystal-structure prediction and powder X-ray diffraction methods, we identified this elusive phase as glycine dihydrate (GDH), representing the first report on the structure of a hydrated glycine structure. The structure of GDH has important implications for the state of glycine in aqueous solution and the mechanisms of glycine crystallization. GDH may also be the form of glycine that comes to Earth from extraterrestrial sources.
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