Synthesis, characterization and magnetic property of a succinate bridged 1D coordination polymer of cobalt(II) containing benzidine as end-capping ligand

A new bis(monodentate) succinate bridged 1D coordination polymer [Co(bnzd)2(μ-suc)(OH2)2]n⋅(H2O)n (1) (bnzd = benzidine; suc = succinate dianion) has been isolated using a one-pot reaction of the building components, and characterized structurally and magneto-structurally. Single crystal X-ray diffraction measurement reveals that each cobalt(II) center adopts an octahedral geometry with a CoN2O4 chromophore coordinated by two N atoms of two bnzd ligands, two O atoms of two water molecules and two O atoms of two suc units. In crystalline state, individual units of 1 self-assemble through cooperative N–H⋯O, O–H⋯O and C–H⋯O hydrogen bonds and C–H⋯π interactions affording a 3D network structure. Variable-temperature magnetic susceptibility measurement of 1 in the 2–300 K temperature range shows weak antiferromagnetic coupling among the adjacent cobalt(II) centers presumably due to long bridging arm of the dicarboxylate.