One Three-Dimensional {Mn4} Cluster Coordination Polymer from a New Tetracarboxylate Linker and N-Donor Ancillary Ligand: Crystal Structure and Magnetic Property

Hydrothermal reactions of biphenyl-2,3,3′,5′-tetracarboxylic acid (H4bptc) with manganese salt in the presence of 1,4-bis(2-pyridylmethyl)piperazine (bpmp) afforded one novel coordination polymer, namely, [Mn2(bptc)(bpmp)0.5]n (1). Its structure was established by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra and TG analysis. Complex 1 contains {Mn4} cluster, exhibiting an unusual mode of two-fold interpenetrating three-dimensional (3D) framework with a (3, 8)-connected (84.102) (4.7.84.102.11.15) topology. In addition, magnetic susceptibility measurements indicate that complex 1 show weak antiferromagnetic interactions between the adjacent manganese ions.