Multi‐Dimensional Cobalt(II) and Nickel(II) Coordination Polymers

A series of metal coordination polymers, [Co-2(NB)(4)(bPP)(2)(H2O)]center dot H2O (1), [Co-2(e,e-trans-chdc)(e,a-cis-chdc)(bpp)(2)] (2), [Ni(e,e-trans-chdc)(bPP)(H2O)(2)] (3), [Ni-2(PDA)(2)(bPP)(2)(H2O)(3)]center dot H2O (4), and [Ni-(mBDC)(bpp)] (5) (NB = 3-nitrobenzoate anion; bpp = 4,4'-trimethylene dipyridine; chdc = cyclohexane-1,4-dicarboxylate anion; PDA = 1,4-phenylenediacetate anion; mBDC = 1,3-benzene dicarboxylate anion), were synthesized from metal ions and organic mixed-ligands by hydrothermal reactions. The single crystal structure analysis revealed that 1, 3, and 4 were 2D sheets with bilayer (1 and 4) and 2-fold interpenetrated layers (3), 2 is a 3D binodal (4,5)-connected framework, and 5 is a 1D chains. The non-covalent interactions of H-bonds and pi-pi stacking caused this conformation of highly cross-linked networks. Compounds 1-5 were further characterized by thermal gravimetric analysis, powder X-ray diffraction, UV-vis, infrared, and PL spectroscopy.