X-Ray structure of a 1D-coordination polymer of copper(II) bearing pyrazine-2,3-dicarboxylic acid and 2-aminopyrimidine

Abstract

A new 1D-coordination polymer of Cu(II) ions, {(2-<br><br>apymH)2[Cu(pyzdc)2]·6H2O}n, (2-apym = 2-aminopyrimidine, pyzdcH2 = pyrazine-<br><br>2,3-dicarboxylic acid), was synthesized based on the proton transfer mechanism<br><br>and characterized by elemental analysis, infrared spectroscopy and<br><br>single crystal X-ray diffraction. The coordination polymer consists of infinite<br><br>chains of [Cu(pyzdc)2]2- bridged across a double chain running along the a-axis<br><br>and discrete (2-apymH)+ fragments. The Cu(II) ion is located on the inversion<br><br>centre in the basal plane of an elongated octahedron with two oxygen atoms<br><br>from adjacent (pyzdc)2- ligands occupying the axial positions. The interaction<br><br>between oxygen atoms of water molecules with the dicarboxylic acid plays an<br><br>important role in the overall supramolecular assembly.