A two-dimensional CdII coordination polymer: poly[di­aqua­[μ3-5,6-bis­(pyridin-2-yl)pyrazine-2,3-di­carboxyl­ato-κ5O2:O3:O3,N4,N5]cadmium]

Acta Crystallographica Section E: Crystallographic Communications

Alfonso, M.¹  Stoeckli-Evans, H.² 

[1] Institute of Chemistry, University of Neuchâtel, Av Bellevaux 51, CH-2000 Neuchâtel, Switzerland;Institute of Physics, University of Neuchâtel, rue Emile-Argand 11, CH-2000 Neuchâtel, Switzerland

关键词: CRYSTAL STRUCTURE;    CADMIUM(II);    SEVENFOLD COORDINATION;    PENTAGONAL BIPYRAMID;    TWO-DIMENSIONAL COORDINATION POLYMER;    NETWORK;    HYDROGEN BONDING;   

DOI  :  10.1107/S2056989016012858

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The reaction of 5,6-bis­(pyridin-2-yl)pyrazine-2,3-di­carb­oxy­lic acid with cadmium dichloride leads to the formation of the title two-dimensional coordination polymer, [Cd(C16H8N4O4)(H2O)2]n. The metal atom is sevenfold coordinated by one pyrazine and one pyridine N atom, two water O atoms, and by two carboxyl­ate O atoms, one of which bridges two CdII atoms to form a Cd2O2 unit situated about a centre of inversion. Hence, the ligand coordinates to the cadmium atom in an N,N′,O-tridentate and an O-monodentate manner. Within the polymer network, there are a number of O—H⋯O hydrogen bonds present, involving the water mol­ecules and the carboxyl­ate O atoms. There are also C—H⋯N and C—H⋯O hydrogen bonds present. In the crystal, the polymer networks lie parallel to the bc plane. They are aligned back-to-back along the a axis with the non-coordinating pyridine rings directed into the space between the networks.

【 授权许可】

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