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The isolation and crystal structure of {Li·(H2O)2·[OP(NMe2)3]}22+·2Cl–: a (LiO)2 ring compound with bridging neutral oxygen (hexamethylphosphormaide) ligands

BARR, D and CLEGG, W and Mulvey, Robert and SNAITH, R (1984) The isolation and crystal structure of {Li·(H2O)2·[OP(NMe2)3]}22+·2Cl–: a (LiO)2 ring compound with bridging neutral oxygen (hexamethylphosphormaide) ligands. Journal of the Chemical Society, Chemical Communications (15). pp. 974-975. ISSN 0022-4936

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Abstract

The low melting-point, hydrocabon-soluble, and moisture-sensitive crystalline material isolated from the reaction of hydrated lithium chloride with OP(NMe2)3(HMPA) has been shown by X-ray crystallography to be the discrete, internally-ionic complex, [Li·(H2O)2·HMPA]22+·2Cl–; the chloride ions are hydrogen bonded to the cations water molecules, which are terminally bonded to the lithium atoms, while the centre of the cation consists of a planar (LiO)2 ring provided by bridiging, yet formally neuttal, HMPA ligands.