New alkali metal primary amide ladder structures derived from tBuNH(2): building cisoid and transoid ring conformations into ladder frameworks

W Clegg, K W Henderson, L Horsburgh, F M Mackenzie, Robert Mulvey

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Two novel alkali metal amide ladder complexes have been synthesised and crystallographically characterised. Derived from the same primary amine precursor (tBuNH(2)), they represent important additions to the series of ladder arrangements previously established within secondary amide chemistry. Thus the sodium amide.amine complex [{[tBuN(H)Na](3) . H(2)NtBu}(x)] forms an infinite wavelike ladder structure. Covering three nitrogen-sodium rungs, its curved sections display a cisoid conformation of amide substituents; but where these curved sections fuse, a transoid conformation is found. Every third sodium cation along the ladder framework is ligated by a tert-butylamine solvent molecule. In contrast, the heterobimetallic derivative, [{[tBuN(H)](2)LiNa . tmeda}(2)], adopts a finite oligomeric ladder structure limited to only four nitrogen-metal rungs in length. The central rungs contain lithium, while the outer rungs contain sodium. As in the all-sodium structure, the ladder is curved; there is a mixture of cisoid and transoid ring conformations within its framework. TMEDA solvent molecules complete the structure by chelating the sodium cations at the ladder ends.

Original languageEnglish
Pages (from-to)53-56
Number of pages4
JournalChemistry - A European Journal
Volume4
Issue number1
DOIs
Publication statusPublished - Jan 1998

Keywords

  • amides
  • ladder structures
  • lithium
  • sodium
  • structure elucidation
  • crystal structures

Fingerprint Dive into the research topics of 'New alkali metal primary amide ladder structures derived from tBuNH(2): building cisoid and transoid ring conformations into ladder frameworks'. Together they form a unique fingerprint.

Cite this