abstract
The crystal structure of the title compound, polymeric hexaaquacobalt(II) diaquadioxodi-mu(2)-pyrazine-bis[mu(3)-N(-phosphonomethyl)iminodiacetato]cobalt(II)divanadate(IV) dihydrate, {[Co(H2O)(6)][CoV2(C3H4O8P)(2)(C4H4N2)(2)(H2O)(2)]center dot-2H(2)O}(n), is the first example of a two-dimensional hybrid framework containing centrosymmetric dimeric [V2O2(pmida)(2)](4-) anionic units [H(4)pmida 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)]}(n)(2n-). Pyrazine ligands, with their centroids located at inversion centres, bridge the above-mentioned Co2+ centres, forming {[Co(H2O)(2)][V2O2(pmida)(2)]}(n)(2n-) 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.
keywords
CADMIUM-ORGANIC FRAMEWORK; CAMBRIDGE STRUCTURAL DATABASE; HYDROTHERMAL SYNTHESIS; CRYSTAL-STRUCTURES; COORDINATION POLYMER; TRIMESIC ACID; 1,2-BIS(4-PYRIDYL)ETHANE; CHEMISTRY; SOLIDS; DESIGN
subject category
Crystallography
authors
Paz, FAA; Shi, FN; Mafra, LS; Makal, A; Wozniak, K; Trindade, T; Klinowski, J; Rocha, J
our authors
Fa-Nian Shi
Researcher
Filipe Alexandre Almeida Paz
Principal Researcher
João Rocha
Full Professor
Luís Mafra
Principal Researcher