Isotypic one-dimensional coordination polymers: catena-poly[[dichloridocadmium]-μ-5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylato-κ2N5:N6] and catena-poly[[dichloridomercury(II)]-μ-5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylato-κ2N5:N6]

Acta Crystallographica Section E: Crystallographic Communications

Helen Stoeckli-Evans¹  Montserrat Alfonso² 

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

关键词: crystal structure;    isotypic coordination polymer;    one-dimensional;    MN2Cl2 bisphenoidal coordination geometry;    dimethyl ester;    pyrazine;    pyridine;    C—H...Cl hydrogen bonding;   

DOI  :  10.1107/S2056989016012093

来源: DOAJ

【 摘 要 】

The isotypic title one-dimensional coordination polymers, [CdCl2(C18H14N4O4)]n, (I), and [HgCl2(C18H14N4O4)]n, (II), are, respectively, the cadmium(II) and mercury(II) complexes of the dimethyl ester of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid. In both compounds, the metal ions are located on a twofold rotation axis and a second such axis bisects the Car—Car bonds of the pyrazine ring. The metal ions are bridged by binding to the N atoms of the two pyridine rings and have an MN2Cl2 bisphenoidal coordination geometry. The metal–Npyrazine distances are much longer than the metal–Npyridine distances; the difference is 0.389 (2) Å for the Cd—N bonds but only 0.286 (5) Å for the Hg—N bond lengths. In the crystals of both compounds, the polymer chains are linked via pairs of C—H...Cl hydrogen bonds, forming corrugated slabs parallel to the ac plane.

【 授权许可】

Unknown