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Figure 7
(a) Scheme of the low-frequency Bg mode eigenvectors at 8.06 cm−1, obtained from phonon calculations. The length of the arrows was chosen according to the magnitude of eigenvectors from the di­methyl­amino­borane four-membered ring obtained from the phonon calculations. The numbering scheme is in accordance with the DFPT calculations. The eigenvectors of the hydrogen atoms were omitted. (b) Evolution of the atomic positions of di­methyl­amino­borane in the temperature range from 173 to 288 K (red) and from 293 to 318 K (grey), determined from the Rietveld refinements. Hydrogen atoms are omitted for clarity. (c) An overlay of packing motifs from the triclinic phase (Jaska et al., 2001BB19) in red and the new monoclinic polymorph in green. The origin was chosen to have a suitable overlay of two molecules (mid left). Hydrogen atoms are omitted for clarity.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 77| Part 2| April 2021| Pages 299-306
https://doi.org/10.1107/S2052520621001979
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