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 (NiII and CrIII) 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.
Highlights
The asymmetric unit of the title compound, (NH4)2[Ni(C2H6N4O2)3]2[Cr(C2O4)3]2Á6.76H2O, comprises two NH4+ cations, two [Ni(C2H6N4O2)3]2+ cations and two [Cr(C2O4)3]3– anions, as well as eight water molecules of crystallization of which only one is fully occupied
In the cationic and anionic complexes, the central atoms (NiII and CrIII) are each surrounded by three bidentate ligands (N-chelating oxamide dioxime and O-chelating oxalate, respectively), resulting in distorted octahedral coordination spheres
O—HÁ Á ÁO 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]
Summary
Tris(oxalato)metallate(III) complex anions, [MIII(C2O4)3]3–, are versatile building blocks for the design of new moleculebased materials with interesting magnetic, electrical and optical properties (Coronado et al, 2000). When [MIII(C2O4)3]3– anions are combined with triply charged tris-bidentate complex cations of D3 symmetry in which the ligating atoms are all bonded to H atoms or OH groups, they build infinite neutral pillars of alternating complex cations and anions that leave channels in the structure (Belombeet al., 2009; Hua et al, 2001; Kuroda, 1991). E76, 1732–1736 research communications forcing additional species into the channels would be by designing compounds with charged, instead of neutral, pillars. In this way, the charge-balancing species could only reside in the channels. The charge-balancing species could only reside in the channels This strategy proved successful by combining tris(oxalato)chromate(III) anions, [Cr(C2O4)3]3–, with tris(oxamide dioxime)nickel(II) cations, [Ni(C2H6N4O2)3]2+, the charge-balancing species being K+ and H3O+ (Mbiangueet al., 2012). Ni1—N2 Ni1—N6 Ni1—N5 Ni1—N9 Ni1—N1 Ni1—N10 Ni2—N13 Ni2—N17 Ni2—N14 Ni2—N21 Ni2—N18 Ni2—N22
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