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. 2020 Jul 17;76(Pt 8):1316-1319.
doi: 10.1107/S2056989020009536. eCollection 2020 Aug 1.

Hexa-aqua-nickel(II) bis-[tri-aqua-μ3-oxalato-di-μ-oxalato-bariumchromate(III)] tetra-hydrate

Yves Alain Mbiangué  1 , Manelsa Lande Ndinga  1 , Jean Pierre Nduga  1 , Emmanuel Wenger  2 , Claude Lecomte  2
Affiliations

Hexa-aqua-nickel(II) bis-[tri-aqua-μ3-oxalato-di-μ-oxalato-bariumchromate(III)] tetra-hydrate

Yves Alain Mbiangué et al. Acta Crystallogr E Crystallogr Commun. .

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.

Keywords: barium complexes; corrugated layers; crystal structure; nickel complexes; tris­(oxalato)chromate(III).

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Figures

Figure 1
Figure 1
The components of the asymmetric unit of (I), showing the atom-numbering scheme and displacement ellipsoids at the 50% probability level.
Figure 2
Figure 2
Connection of [Cr(C2O4)3]3– units with Ba2+ cations into a ladder-like chain. Barium-coordinating water mol­ecules have been omitted for clarity.
Figure 3
Figure 3
Three adjacent ladder-like chains connected through Ba2O2 units into a corrugated layer, viewed in the (101) plane (a) and along [010] (b). Barium-coordinating water mol­ecules have been omitted for clarity.
Figure 4
Figure 4
Packing of the crystal structure of (I) in a view along [010], showing corrugated layers inter­leaved by [Ni(H2O)6]2+ complex cations and water mol­ecules of crystallization. Barium-coordinating water mol­ecules have been omitted for clarity.
See this image and copyright information in PMC

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