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Hexa-aqua-nickel(II) bis-[tri-aqua-?3-oxalato-di-?-oxalato-bariumchromate(III)] tetra-hydrate.


ABSTRACT: The title compound, [Ni(H2O)6][BaCr(C2O4)3(H2O)3]2·4H2O, was obtained in the form of single crystals from the slow evaporation of an aqueous mixture of {Ba6(H2O)17[Cr(C2O4)3]4}·7H2O and NiSO4·6H2O in the molar ratio 1:4. Its structure is made up of corrugated anionic (101) layers of formula [BaCr(C2O4)3(H2O)3] n n - that leave voids accommodating the charge-compensating cations, [Ni(H2O)6]2+ (point group symmetry ), as well as the water mol-ecules of crystallization. The anionic layers are built from the connection of barium and chromium atoms through bridging oxalate ligands. The CrIII atom is hexa-coordinated by O atoms of three oxalate ligands while the BaII atom is tenfold coordinated by three O atoms of water mol-ecules and seven O atoms of four oxalate ligands. Each NiII atom sits on an inversion center and is coordinated by six water mol-ecules. One of the uncoordinated water mol-ecules is disordered over two sites, with a refined occupancy ratio of 0.51?(5):0.49?(5). In the crystal, extensive O-H?O hydrogen-bonding inter-actions link the anionic layers, the charge-balancing cations as well as the water mol-ecules of crystallization into a three-dimensional supra-molecular network.

SUBMITTER: Mbiangue YA 

PROVIDER: S-EPMC7405579 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Hexa-aqua-nickel(II) bis-[tri-aqua-μ<sub>3</sub>-oxalato-di-μ-oxalato-bariumchromate(III)] tetra-hydrate.

Mbiangué Yves Alain YA   Ndinga Manelsa Lande ML   Nduga Jean Pierre JP   Wenger Emmanuel E   Lecomte Claude C  

Acta crystallographica. Section E, Crystallographic communications 20200717 Pt 8


The title compound, [Ni(H<sub>2</sub>O)<sub>6</sub>][BaCr(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>3</sub>]<sub>2</sub>·4H<sub>2</sub>O, was obtained in the form of single crystals from the slow evaporation of an aqueous mixture of {Ba<sub>6</sub>(H<sub>2</sub>O)<sub>17</sub>[Cr(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>]<sub>4</sub>}·7H<sub>2</sub>O and NiSO<sub>4</sub>·6H<sub>2</sub>O in the molar ratio 1:4. Its structure is made up of corrugated anionic (101) layers of formula  ...[more]

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