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Isotypic one-dimensional coordination polymers: catena-poly[[di-chlorido-cadmium]-?-5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxyl-ato-?(2) N (5):N (6)] and catena-poly[[di-chlorido-mercury(II)]-?-5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxyl-ato-?(2) N (5):N (6)].

ABSTRACT: 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-di-carb-oxy-lic acid. In both compounds, the metal ions are located on a twofold rotation axis and a second such axis bis-ects 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.

SUBMITTER: Alfonso M 

PROVIDER: S-EPMC4971876 | biostudies-other | 2016 Aug

REPOSITORIES: biostudies-other

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Isotypic one-dimensional coordination polymers: catena-poly[[di-chlorido-cadmium]-μ-5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxyl-ato-κ(2) N (5):N (6)] and catena-poly[[di-chlorido-mercury(II)]-μ-5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxyl-ato-κ(2) N (5):N (6)].

Alfonso Montserrat M   Stoeckli-Evans Helen H  

Acta crystallographica. Section E, Crystallographic communications 20160729 Pt 8

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-di-carb-oxy-lic acid. In both compounds, the metal ions are located on a twofold rotation axis and a second such axis bis-ects 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  ...[more]