Abstract
The central structural motif of the title coordination polymer, [Co(NO3)2(C4H4N2)(CH3CN)2(H2O)2] n , is a chain composed of Co(II) ions linked by bis-monodentate bridging pyrazine ligands through their N atoms. The Co(II) ion is located on an inversion center and is additionally coordinated by two O atoms of water mol-ecules and two N atoms of aceto-nitrile mol-ecules. The resultant N4O2 coordination sphere is distorted octa-hedral. The linear cationic chains extend parallel to the a axis and are aligned into layers parallel to the ac plane. Nitrate anions are situated in the space between the Co(II) chains and form O-H⋯O hydrogen bonds with the coordinating water mol-ecules, leading to a three-dimensional network structure. Weak C-H⋯O hydrogen bonds are also present between pyrazine or aceto-nitrile mol-ecules and the nitrate anions.
Highlights
[Co(NO3)2(C4H4N2)(CH3CN)2(H2O)2]n, is a chain composed of CoII ions linked by bis-monodentate bridging pyrazine ligands through their N atoms
In the design of coordination polymers, the choice of bridging ligands between metal atoms plays an important role in the formation of the final structure and the resulting properties
From the point of view of mediating magnetic interactions, the pyrazine molecule offers some advantages compared to other bidentate bridging ligands such as 4,40 -bipyridine
Summary
In the design of coordination polymers, the choice of bridging ligands between metal atoms plays an important role in the formation of the final structure and the resulting properties. During our investigations of the preparation conditions and magnetic properties of compounds with ladder-like structures, we have used pyrazine as a bis-monodentate bridging ligand to link paramagnetic metal cations. From the point of view of mediating magnetic interactions, the pyrazine molecule offers some advantages compared to other bidentate bridging ligands such as 4,40 -bipyridine. In some of the structures with the latter ligand, the two pyridine rings are not co-planar and can magnetically isolate metal atoms A fragment of the one-dimensional chain structure of the title compound with displacement ellipsoids drawn at the 50% probability level. We report the preparation and structure of a pyrazine-bridged chain structure obtained by reacting pyrazine and cobalt(II) nitrate hexahydrate using acetonitrile as the solvent
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