Syntheses and Structures of [Sn{NR}2{Sn(-NMe2)}2]: Model Intermediates in the Formation of Imido Grou
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- 作者：Robert E. Allan ; Michael A. Beswick ; Georgina R. Coggan ; Paul R. Raithby ; Andrew E. H. Wheatley ; and Dominic S. Wright
- 刊名：Inorganic Chemistry
- 出版年：1997
- 出版时间：November 5, 1997
- 年：1997
- 卷：36
- 期：23
- 页码：5202 - 5205
- 全文大小：188K
- 年卷期：v.36,no.23(November 5, 1997)
- ISSN：1520-510X
文摘
The 1:1 reactions of aliphatic primary amines[RNH2] with [Sn(NMe2)2]yield the imido Sn(II) cubanes [SnNR]4;however, for highly sterically crowded amines this reaction is retardedand the model intermediates[Sn{NR}2{Sn(
-NMe2)}2] [R =2,6-PriC6H3 (Dipp)(1), 2,4,6-Me3C6H2 (Mes)(2)] can be isolated. The latter indicatethatthe formation of imido cubanes and trimers from the metalationreactions of primary amines with a range ofgroup 14 precursors may occur via a common reaction sequence involvingstepwise metalation. Thelow-temperature X-ray structures of 1 and 2 showthem to have similar [Sn3N4] cagearrangements consisting ofa planar {Sn(NR)2} unit straddling a{Sn(-NMe2)}2 ring. Nointermolecular association occurs in the solid-state structure of 1. However, the reduced stericdemands of the Mes groups in 2 lead to a complicatedthree-dimensional network consisting of fused hexameric units linked bySn···Sn interactions.
-NMe2)}2] [R =2,6-PriC6H3 (Dipp)(1), 2,4,6-Me3C6H2 (Mes)(2)] can be isolated. The latter indicatethatthe formation of imido cubanes and trimers from the metalationreactions of primary amines with a range ofgroup 14 precursors may occur via a common reaction sequence involvingstepwise metalation. Thelow-temperature X-ray structures of 1 and 2 showthem to have similar [Sn3N4] cagearrangements consisting ofa planar {Sn(NR)2} unit straddling a{Sn(-NMe2)}2 ring. Nointermolecular association occurs in the solid-state structure of 1. However, the reduced stericdemands of the Mes groups in 2 lead to a complicatedthree-dimensional network consisting of fused hexameric units linked bySn···Sn interactions.