Synthesis and Coordination of the Cagelike Siloxane Compounds E2{(SiMe2)2O}3 (E = As, Sb, Bi)

Synthesis and Coordination of the Cagelike Siloxane Compounds E2{(SiMe2)2O}3 (E = As, Sb, Bi)
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笼状硅氧烷化合物E2{(SiMe2)2O}3 (E = As, Sb, Bi)的合成与配位

DOI:
10.1002/ejic.201300479
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发表时间:
2013
影响因子:
2.3
通讯作者:
K. Harms
K. Harms
中科院分区:
化学3区
文献类型:
--
作者:
C. Bimbös;M. Jost;C. von Hänisch;K. Harms

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E = P、As、Sb 和 Bi(分别为 1、4、5 和 6)的笼状化合物 [E2{(SiMe2)2O}3] 通过 Na3E(E = P、As、Sb、Bi)或 [Li(dme)EH2](E = P、As;dme = 二甲氧基乙烷)与1,3-二氯-1,1,3,3-四甲基二硅氧烷。通过 X 射线晶体学分析分离并表征了这些化合物。讨论了E-Si键长和Si-E-Si角等主要结构参数,并与类似化合物进行了比较。这些化合物中较小的 Si-E-Si 角可归因于空间和电子原因。此外,还形成了R3M–E[(SiMe2)2O]3E–MR3(M = Al,E = As,Sb;M = Ga,E = Sb)路易斯酸碱加合物以及化合物1的W(CO)5加合物和杂配Na[Al(ORF)4](RF=C(CF3)3)加合物,以研究笼状化合物的配位性质。由配位引起的结构变化遵循哈兰德模型,该模型给出了加合物稳定性的定性信息。哈兰德模型所做的假设对于一组通用的路易斯酸是有效的。为了研究笼内部的配位,进行 4 与 Li[Al(ORF)4] 的反应,产生结构为 As4[(SiMe2)2O]6 的新二聚配体。
The cage compounds [E2{(SiMe2)2O}3] for E = P, As, Sb, and Bi (1,4,5, and6, respectively) are readily accessible in moderate yields by the reaction of Na3E (for E = P, As, Sb, Bi) or [Li(dme)EH2] (for E = P, As; dme = dimethoxyethane) with 1,3‐dichloro‐1,1,3,3‐tetramethyldisiloxane. These compounds were isolated and characterized by X‐ray crystallographic analysis. The major structural parameters such as the E–Si bond length and the Si–E–Si angles are discussed and compared with those of similar compounds. The small Si–E–Si angles in these compounds are attributable to steric and electronic reasons. Further, the R3M–E[(SiMe2)2O]3E–MR3(M = Al, E = As, Sb; M = Ga, E = Sb) Lewis acid–base adducts were formed as well as the W(CO)5adduct of compound1and a heteroleptic Na[Al(ORF)4] (RF= C(CF3)3) adduct with4to investigate the coordination properties of the cage compounds. The structural changes caused by coordination follow the Haaland model, which gives qualitative information on the adduct stability. The assumptions made by the Haaland model are valid for a versatile set of Lewis acids. To investigate coordination on the inside of the cage, a reaction of4with Li[Al(ORF)4] was performed to yield a new dimeric ligand of the constitution As4[(SiMe2)2O]6.
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