Catena-Poly[[bis-(quinolin-8-amine-κ2 N,N')cadmium(II)]-μ-cyanido-κ2 N:C-[dicyanidonickel(II)]-μ-cyanido-κ2 C:N

Selma Khelfa,Fatima Setifi,Mohammed Hadi Al-Douh,Marwa Touil,Christopher Glidewell,Zouaoui Setifi

doi:10.1107/s241431462100568x

Abstract

In the title compound, [CdNi(C9H8N2)2(CN)4] n , the Cd and Ni atoms both lie on centres of inversion in space group P21/c. The Cd atom is coordinated by two bidentate quinolin-8-amine ligands and by the N atoms of two cyano ligands, while the square planar Ni atom is coordinated by the C atoms of four cyano ligands. These units form a one-dimensional coordination polymer containing an (-NC-Ni-CN-Cd-) n backbone, and the coordination polymer chains are linked into a three-dimensional array by a combination of N-H⋯N and C-H⋯N hydrogen bonds, augmented by a π-π stacking inter-action.

Highlights

In the title compound, [CdNi(C9H8N2)2(CN)4]n, the Cd and Ni atoms both lie on centres of inversion in space group P21/c
These units form a one-dimensional coordination polymer containing an (–NC—Ni—CN—Cd–)n backbone, and the coordination polymer chains are linked into a three-dimensional array by a combination of N—HÁ Á ÁN and C— HÁ Á ÁN hydrogen bonds, augmented by a – stacking interaction
In a continuation of our general study of this area, we report the crystal and molecular structure of the title compound

Summary

Structure description

Transition-metal coordination compounds in which cyano ligands play the main structure-forming role, so-called cyanocarbanion or cyanometallate complexes, have been the subject of interest for many years, because of their magnetic and luminescent properties (Sieklucka et al, 2011; Benmansour et al, 2007, 2008, 2009, 2012; Setifi et al, 2009; Yuste et al, 2009; Lehchili et al, 2017) including, in particular, their spin-crossover behaviour (Benmansour et al, 2010; Setifi et al, 2013, 2014, Bartual-Murgui et al, 2013). In a continuation of our general study of this area, we report the crystal and molecular structure of the title compound. In the structure of the title compound, the Cd and Ni ions both lie on centres of inversion, selected for convenience as those at (0.5, 0.5, 0.5) and (0.5, 0.5, 0), respectively. The [Ni(CN)4]2À units adopts the usual square planar configuration, while the Cd centre is coordinated by two bidentate quinolin-8-amine units and by the N atoms of two cyano ligands. There are two types of N—HÁ Á ÁN hydrogen bond in the structure (Table 1). Those involving atom H8A lie within the coordination. Cg1 is the centroid of the C4A/C5–C8/C8A ring

DÁ Á ÁA

Absorption correction

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