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DOI: 10.1039/A801280F (Paper) Reference Section for: Chem. Commun., 1998, 1011-1012

First structurally characterised lithium hexafluorophosphate complexes with acyclic Lewis bases: ion-separated [Li2(hmpa)5]2+·2(PF6–) and ion-contacted [(pmdeta)LiPF6]2 [hmpa = (Me2N)3PO; pmdeta = MeN(CH2CH2NMe2)2]

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David R. Armstrong, David R. Armstrong, Amit H. Khandelwal, Paul R. Raithby, Lesley C. Kerr, Sonja Peasey, Paul R. Raithby, Gregory P. Shields, Ronald Snaith and Dominic S. Wright

Abstract

Reactions of NH4PF6 with BunLi in toluene containing hmpa or pmdeta afford the complexes [Li2- (hmpa)5]2+·2(PF6)– 1, an ion-separated species containing an unusual dinuclear dication, and [(pmdeta)LiPF6]2 2 in which PF6– anions bridge (pmdeta)Li+ units via Li···F interactions, this being the first observation of a bridging mode for this anion; ab initio MO calculations help explain the very different structures of 1 and 2.

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