Synthesis and crystal structure of a 3-d polymeric cobalt(II) and sodium complex with pyrazine-2-carboxylate as a bridging ligand

Abstract

A complex with a three-dimensional structure {[Na₃Co(pyz)₃(H₂O)₄(ClO₄)₂]} _n (pyz = pyrazine-2-carboxylate anion) has been synthesized and its crystal structure determined by X-ray crystallography. The complex crystallizes in a triclinic system with a space group Pī and a = 8.598(11), b = 11.382(15), c = 14.496(19) Å, α = 87.79(2), β = 88.21(2), γ = 82.08(2)°. The Co(II) ion is located in a distorted octahedral environment with three oxygen atoms and three nitrogen atoms, from the three pyr ligands. Na(1) ion is coordinated by four oxygen atoms and two nitrogen atoms, in which O(1), O(2), O(2A), N(4A) and N(6A) come from ligand pyr while O(15) comes from H₂O. Na(2) and Na(3) ions are each coordinated by six oxygen atoms. Through coordination of the bridging ligand pyr with Co(II) and Na(I) a three-dimensional net structure is formed.

Keywords:

• X-ray crystal structure
• Cobalt
• Pyrazine ligands
• Crystal engineering

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20271043) and the Natural Science Foundation of Shandong Province (Y2002B10).

Supplementary Material

The X-ray crystallographic file, in CIF format, is available from the Cambridge Crystallographic Data Centre on quoting the deposition number CCDC 197279.