Polymorphism in the Crystal Structures of the Group 13 Trimethyls
Polymorphism in the Crystal Structures of the Group 13 Trimethyls
复制标题
第 13 族三甲基晶体结构的多晶型现象
DOI：
10.1021/om0300272
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发表时间：
2003
期刊：
影响因子：
2.8
通讯作者：
S. Parsons
中科院分区：
文献类型：
--
作者：
R. Boese;A. J. Downs;T. M. Greene;A. W. Hall;C. Morrison;S. Parsons
三甲基硼（BMe 3）和三甲基镓（GaMe 3）的新多晶型物的晶体结构已经确定;此外，三甲基铊（TlMe 3）的晶体结构也已经重新确定。BMe 3晶体结构代表了固态13族三甲基衍生物的一种新结构类型。与其较重的类似物相比，它由仅含有非常弱相互作用的BMe 3分子的层组成。GaMe 3通过长的镓-甲基分子间相互作用形成梯形假聚合物，Ga···C距离在3.096（3）−3.226（4）A范围内。这是比较与最近报道的晶体结构的多晶型物，其中，像InMe 3和TlMe 3，其特征在于通过形成的伪四聚体。结晶和次级相互作用的影响进行了分析，通过比较与相关的晶体学，气相电子衍射，光谱研究这些和其他三甲基衍生物的13族元素。The energetic differere.
Crystal structures have been determined for trimethylboron, BMe3, and for a new polymorph of trimethylgallium, GaMe3; in addition, the crystal structure of trimethylthallium, TlMe3, has been redetermined. The BMe3 crystal structure represents a new structural type for the group 13 trimethyl derivatives in the solid state. In contrast to its heavier analogues, it consists of layers containing only very weakly interacting BMe3 molecules. GaMe3 forms a ladder-like pseudo-polymer via long gallium-to-methyl intermolecular interactions with Ga···C distances in the range 3.096(3)−3.226(4) A. This is compared with a recently reported crystal structure of a polymorph, which, like InMe3 and TlMe3, is characterized by the formation of pseudo-tetramers. The effects of crystallization and secondary interactions have been analyzed by comparison with related crystallographic, gas-phase electron diffraction, and spectroscopic studies of these and other trimethyl derivatives of the group 13 elements. The energetic differe...