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Role of Steric Hindrance in the Crystal Packing of Z′ = 4 Superstructure of Trimethyltin Hydroxide
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-01-22 00:00:00 , DOI: 10.1021/acs.cgd.7b01295
S. Dey 1 , A. Schönleber 1 , S. Mondal 1 , S. I. Ali 1 , S. van Smaalen 1
Affiliation  

The room-temperature crystal structure of trimethyltin hydroxide, (CH3)3SnOH, 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 P21cn 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 (CH3)3SnOH. Crystalline (CH3)3SnOH 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 83-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 (CH3)3Sn 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.

中文翻译:

立体阻碍在三甲基锡氢氧化物Z '= 4超结构的晶体堆积中的作用

氢氧化三甲基锡(CH 33 SnOH的室温晶体结构已由Anderson等人描述。[水晶。增长目标。201111,820-826]作为2一个×2 b ×8 Ç,32倍上层建筑。我们报告a a × b ×8 c,具有正交P 2 1 cn对称性且Z '= 4的八倍超结构。在假定的沿ab的超晶格反射位置观察到结构化散射*在安德森等人的实验中可能以布拉格反射的形式出现。另外,安德森等。并且目前的工作可能已经研究了(CH 33 SnOH的不同多晶型物。晶体(CH 33 SnOH构成平行于c排列的聚合物链。在220 K的八倍上部结构中,聚合物链的链状O–Sn–O单元具有扭曲的曲折排列,在氧气处的弯曲角约为139.2°。此结构与已发布的32倍超结构模型中的8 3螺旋排列本质上不同。之字形结构扭曲的起源是由相邻羟基的氢原子与(CH33个锡组。链条堆积的受阻是由相邻链条之间的甲基之间的空间位阻决定的,该位阻阻止了链间C–H···O氢键的形成。
更新日期:2018-01-22
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