[Co(H2O)6]{[Co(C4H4N2)(H2O)2][V2O2(pmida)2]}·2H2O [H4pmida is N‐(phosphono­meth­yl)imino­diacetic acid]: the first two‐dimensional hybrid framework containing [V2O2(pmida)2]4− building blocks

The crystal structure of the title compound, polymeric hexa­aqua­cobalt(II) diaqua­dioxodi-μ2-pyrazine-bis­[μ3-N-(phos­phono­meth­yl)imino­diacetato]cobalt(II)divanadate(IV) dihydrate, {[Co(H2O)6][CoV2(C3H4O8P)2(C4H4N2)2(H2O)2]·2H2O}n, is the first example of a two-dimensional hybrid framework containing centrosymmetric dimeric [V2O2(pmida)2]4− anionic units [H4pmida is N-(phosphono­meth­yl)imino­diacetic acid]. The structure contains two crystallographically unique cobalt(II) centres, both located at inversion centres and exhibiting Jahn–Teller-distorted octa­hedral coordination geometries. One Co2+ cation establishes physical links between adjacent [V2O2(pmida)2]4− anionic units, forming one-dimensional anionic ribbons which run along the [010] direction, {[Co(H2O)2][V2O2(pmida)2]}n2n−. Pyrazine ligands, with their centroids located at inversion centres, bridge the above-mentioned Co2+ centres, forming {[Co(H2O)2][V2O2(pmida)2]}n2n− anionic layers which alternate along the [001] direction with [Co(H2O)6]2+ cations and the water mol­ecules of crystallization. An extensive and highly directional hydrogen-bonded network inter­connects the structural components.

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