Syntheses and Structures of [Sn{NR}2{Sn(μ-NMe2)}2]: Model Intermediates in the Formation of Imido Group 14 Cages and Rings [R = 2,6-Pr2iC6H3 (Dipp), 2,4,6-Me3C6H2 (Mes)]

Robert E. Allan, Michael A. Beswick, Georgina R. Coggan, Paul R. Raithby, Andrew E.H. Wheatley, Dominic S. Wright

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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 retarded and the model intermediates [Sn{NR}2-{Sn(μ-NMe2)}2] [R = 2,6-PriC6H3 (Dipp) (1), 2,4,6-Me3C6H2 (Mes) (2)] can be isolated. The latter indicate that the formation of imido cubanes and trimers from the metalation reactions of primary amines with a range of group 14 precursors may occur via a common reaction sequence involving stepwise metalation. The low-temperature X-ray structures of 1 and 2 show them to have similar [Sn3N4] cage arrangements consisting of a planar {Sn(NR)2} unit straddling a {Sn(μ-NMe2)}2 ring. No intermolecular association occurs in the solid-state structure of 1. However, the reduced steric demands of the Mes groups in 2 lead to a complicated three-dimensional network consisting of fused hexameric units linked by Sn⋯Sn interactions.

Original languageEnglish
Pages (from-to)5202-5205
Number of pages4
JournalInorganic Chemistry
Issue number23
Publication statusPublished - 5 Nov 1997

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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