Hydrothermal Synthesis and Crystal Structure of a Co(II) Coordination Polymer Assembled by 2,4-Pyridinedicarboxylic Acid and 1,4-Bis(imidazol-1-ylmethyl)-benzene) Ligands

A metal-organic coordination polymer [Co(PDC)(bix)(H2O)]n(H2PDC=2,4-pyridinedicarboxyic acid,bix = 1,4-bis(imidazol-1-ylmethyl)-benzene) 1 has been hydrothermally synthesized and structurally characterized by elemental analyses,TG,IR,UV and single-crystal X-ray diffraction.The complex crystallizes in monoclinic,space group C2/c with a=2.525 5(4),b=1.318 98(19),c=1.441 5(2) nm,β=118.656(2)°,V=4.213 5(11) nm3,C21H19CoN5O5,Mr=480.34,Dc=1.514 g·cm-3,μ(Mo Kα)=0.857 9 mm-1,F(000)=1 976,Z=8,R=0.030 5 and wR=0.067 4.In the crystalstructure,the cobalt atom is six-coordinated with two carboxylate oxygen atoms from two different PDC ligands and two nitrogen atoms from two bix ligands,one nitrogen atom from PDC ligand and one coordinated water moleculore,showing a distorted octahedral geometry.Furthermore,it exhibits a 3D supramolecular network through hydrogen bonding interactions.