Cooperative cation and anion coordination by a bifunctional imidophosphorane ligand framework; syntheses and structures of [LiCl{ButNHP(μ-NBut)2PNH(2-py)}3] and [{ButNP(μ-NBut)2PN(2-py)} Li2·{Li(ButN)2P}]

Abstract
The neutral ligand [ButNHP(μ-NBut)2PNH(2-py)] and its dilithiate [{ButNP(μ-NBut)2PN(2-py)}Li 2] exhibit a parallel ability to coordinate cations and anions, as revealed in the structures of the tris-solvate [LiCl{ButNHP(μ-NBut)2PNH(2-py) }3] 1 and the unusual co-complex [{ButNP(μ-NBut)2PN(2-py)}Li 2·{Li(ButN)2P}] 2.

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