Lithium Dicobalt Tripolyphosphate and Lithium Dinickel Tripolyphosphate

Isotypic lithium dicobalt triphosphate, LiCo₂P₃O₁₀, and lithium dinickel triphosphate, LiNi₂P₃O₁₀, have been synthesized and characterized by single-crystal X-ray diffraction. These are the first observations of non-hydrated mixed-metal tripolyphosphates. P₃O^5-₁₀ groups are situated on a mirror plane, with successive PO₃ moieties displaying both staggered and eclipsed conformations. Octahedrally coordinated Co²⁺ and Ni²⁺ ions form a staggered chain [Co...Co 3.286 (1) and 3.133 (1) Å, Ni...Ni 3.201 (1) and 3.023 (1) Å], with successive metal ions bridged by two O atoms.

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