Crystal structure of di-ammonium bis-[tris-(oxamide dioxime-κ² N,N')nickel(II)] bis-[tris-(oxalato-κ² O,O')chromate(III)] 6.76-hydrate.

ABSTRACT: The asymmetric unit of the title compound, (NH₄)₂[Ni(C₂H₆N₄O₂)₃]₂[Cr(C₂O₄)₃]₂·6.76H₂O, comprises two NH₄ ⁺ cations, two [Ni(C₂H₆N₄O₂)₃]²⁺ cations and two [Cr(C₂O₄)₃]^3- anions, as well as eight water mol-ecules of crystallization of which only one is fully occupied. In the cationic and anionic complexes, the central atoms (Ni^II and Cr^III) are each surrounded by three bidentate ligands (N-chelating oxamide dioxime and O-chelating oxalate, respectively), resulting in distorted octa-hedral coordination spheres. In the crystal, O-H⋯O hydrogen bonds between the oxamide dioxime ligands as donor groups and the oxalate ligands as acceptor groups alternately connect the cationic and anionic complexes into infinite pillars extending parallel to [100]. Moreover, N-H⋯O hydrogen bonds between the same ligands connect neighboring pillars, thus delineating channels that accommodate the charge-balancing NH₄ ⁺ cations as well as the water mol-ecules of crystallization. Although the H atoms could not be localized for these two species, the corresponding N⋯O and O⋯O distances indicate hydrogen bonds of medium strength.

SUBMITTER: Mbiangue YA 

PROVIDER: S-EPMC7643241 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature