A unique lithium halide complex, [(LiBr)2·3HMPA·toluene]: synthesis from reaction of solid NH4Br with BunLi in HMPA (hexamethylphosphoramide)/toluene media, crystal structure showing two Li–Br units linked by three µ2-HMPA ligands, and detection of 7Li 31P coupling in solutions of the complex

D BARR, M J DOYLE, Robert Mulvey, P R RAITHBY, D REED, R SNAITH, D S WRIGHT

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Abstract

Reaction of solid NH4Br with BunLi and HMPA (hexamethylphosphoramide)(1 : 1 : 2 ratio) in toluene produces (LiBr)2·3HMPA·toluene, (1), shown by X-ray crystallography to contain (LiBr)2·3HMPA molecules whose two terminal Li–Br units are linked by three µ2-HMPA ligands and with toluene molecules lying between these units in the lattice; in arene solutions, the (LiBr)2·3HMPA units remain intact, giving rise in 7Li n.m.r. spectra to 1 : 3 : 3 : 1 quartets caused by through-bond (OP) coupling of each 7Li nucleus to three 31P(HMPA) centres.
Original languageEnglish
Pages (from-to)318-319
Number of pages2
JournalJournal of the Chemical Society, Chemical Communications
Issue number5
DOIs
Publication statusPublished - 1 Mar 1989

Keywords

  • lithium halide complex
  • X-ray crystallography
  • lattice

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