Home > Publications database > Role of Steric Hindrance in the Crystal Packing of Z ′ = 4 Superstructure of Trimethyltin Hydroxide > print

001     413911
005     20250729164733.0
024 7 _ |a 10.1021/acs.cgd.7b01295
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100 1 _ |a Dey, Somnath
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245 _ _ |a Role of Steric Hindrance in the Crystal Packing of Z ′ = 4 Superstructure of Trimethyltin Hydroxide
260 _ _ |a Washington, DC
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500 _ _ |a © American Chemical Society; Post referee fulltext in progress; Embargo 12 months from publication
520 _ _ |a The room-temperature crystal structure of trimethyltin hydroxide, (CH$_3$)$_3$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$_1$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$_3$)$_3$SnOH. Crystalline (CH$_3$)$_3$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$_3$-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$_3$)$_3$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.
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700 1 _ |a Schoenleber, Andreas
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700 1 _ |a Mondal, S.
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700 1 _ |a Ali, S. I.
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700 1 _ |a van Smaalen, S.
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773 _ _ |a 10.1021/acs.cgd.7b01295
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