caa a22 4500 378854844 CHVBK 20180305123332.0 cr unu---uuuuu 161128e20030501xx s 000 0 eng 10.1524/zkri.218.5.366.20729 doi (NATIONALLICENCE)gruyter-10.1524/zkri.218.5.366.20729 Structural distortion of the α, β, and γ polymorphs of glycine on cooling [Elektronische Daten] [E. V. Boldyreva, T. N. Drebushchak, E. S. Shutova] The effect of cooling down to 150 K on the structures of α- (s.g. P21/n), β- (s.g. P21), and γ- (s.g. P31) polymorphs of glycine was studied by X-ray single-crystal diffraction. No polymorphic transformations were detected. Relative volume changes and the anisotropy of structural distortion of the three polymorphs of glycine were compared. Maximum contraction of structures was measured in the b-direction for the α- and β-polymorphs, and in the a-direction for the γ-polymorph. Minimum contraction in the γ-polymorph was measured in c-direction. The structures of the α- and the β-polymorphs slightly expanded on cooling in the directions close to c. The directions of maximum and minimum lattice strain were related to the directions of weak and strong hydrogen bonds in the structures. Crystal structures for the three polymorphs were refined at 294 K and at 150 K. The effects of cooling on the intramolecular geometry of glycine molecules and on the intermolecular hydrogen bonds in all the three polymorphs were compared. Structural distortion on cooling was compared with that on increasing hydrostatic pressure. © 2003 Oldenbourg Wissenschaftsverlag GmbH Crystallography nationallicence Inorganic chemistry nationallicence Organic chemistry nationallicence Boldyreva E. V. aut Drebushchak T. N. aut Shutova E. S. aut Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 218/5(2003-05-01), 366-376 2194-4946 218:5<366 2003 218 zkri https://doi.org/10.1524/zkri.218.5.366.20729 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zkri.218.5.366.20729 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Boldyreva E. V. aut NATIONALLICENCE 700 1- Drebushchak T. N. aut NATIONALLICENCE 700 1- Shutova E. S. aut NATIONALLICENCE 773 0- Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 218/5(2003-05-01), 366-376 2194-4946 218:5<366 2003 218 zkri CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter