Two 2-fold interpenetrated frameworks showing different topologies based on the isomerous benzenedicarboxylate mixed with a flexible N,N′-type ligand

This paper presents two 2-fold parallel interpenetrated polymers, namely ZnCo(bpp)(m-BDC)(2) (1) and Co(bpp)(p-BDC)(2), based on isomerous 1,3-benzenedicarboxylate (m-BDC) and 1,4-benzenedicarboxylate (p-BDC). Compounds 1 and 2 have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, IR, ICP, TGA, DSC, and element analysis. 1 crystallizes in the triclinic space group P (1) over bar and affords a three-dimensional (3D) six-connected alpha-Po network, whereas 2 crystallizes in the orthorhombic space group Pbca and gives an usual 2D four-connected 4(4) grid. These interpenetrated topologies should be attributed to the high functionality and adaptability of the 1,3-bis(4-pyridyl) propane (bpp) ligand.