TY  - JOUR
AU  - Dey, Somnath
AU  - Schoenleber, Andreas
AU  - Mondal, S.
AU  - Ali, S. I.
AU  - van Smaalen, S.
TI  - Role of Steric Hindrance in the Crystal Packing of Z ′ = 4 Superstructure of Trimethyltin Hydroxide
JO  - Crystal growth & design
VL  - 18
IS  - 3
SN  - 1528-7505
CY  - Washington, DC
PB  - ACS Publ.
M1  - PUBDB-2018-03799
SP  - 1394 - 1400
PY  - 2018
N1  - © American Chemical Society; Post referee fulltext in progress; Embargo 12 months from publication
AB  - The room-temperature crystal structure of trimethyltin hydroxide, (CH<sub>3</sub>)<sub>3</sub>SnOH, has been described by Anderson et al. [Cryst. Growth Des. 2011, 11, 820–826] as a 2a × 2b × 8c, 32-fold superstructure. We report a a × b × 8c, eight-fold superstructure with orthorhombic P2<sub>1</sub>cn symmetry and Z′ = 4. Structured diffuse scattering observed at the positions of presumed superlattice reflections along a* and b* might have appeared as Bragg reflections in the experiment by Anderson et al. Alternatively, Anderson et al. and the present work might have studied different polymorphs of (CH<sub>3</sub>)<sub>3</sub>SnOH. Crystalline (CH<sub>3</sub>)<sub>3</sub>SnOH constitutes polymeric chains arranged parallel to c. In the eight-fold superstructure at 220 K, the polymeric chains possess a distorted zigzag arrangement of linked linear O–Sn–O units with bent angle at oxygen of ∼139.2°. This structure is essentially different from the 8<sub>3</sub>-helical arrangement in the published 32-fold superstructure model. The origin of the distorted zigzag structure is explained by steric hindrance between hydrogen atoms of adjacent hydroxy groups and (CH<sub>3</sub>)<sub>3</sub>Sn groups. Frustration in the packing of the chains is determined by steric hindrance between methyl groups of neighboring chains, which prevents the formation of interchain C–H···O hydrogen bonds.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000427203700018
DO  - DOI:10.1021/acs.cgd.7b01295
UR  - https://bib-pubdb1.desy.de/record/413911
ER  -