Crystal Structures and Properties of Zn(II)/Cd(II) Coordination Polymers Based on Semirigid Tetrahedral Quadridentate Ligand

Two complexes, {[Cd-2(L-1)(1,4-NDC)(2)]center dot 2H(2)O} (1) and {[Zn-2(L-2)(1,4-NDC)(2)]center dot DMF center dot 3H(2)O)}(n) (2) (L-1=tetrakis (4-pyridyloxymethylene)methane, L-2=tetrakis(3-pyridyloxymethylene)methane, 1,4-NDC=naphthalene-1,4-dicarboxylic acid) are obtained by the self-assembly reaction of L-1 or L-2, 1,4-NDC, and d(10) metal ions under solvothermal conditions. The X-ray analysis reveals that 1 is constructed from a 1D zigzag chain [Cd(1,4-NDC)](n) which is linked by L-1 ligand to yield a 3D framework. And yet in case of 2, one double helix is mutually interdigitated by another 1D chain into a 2D network. Above all, the effect of steric hindrance of the auxiliary linker on the structural diversity of CPs can be discussed in great detail by the introduction of two kinds of auxiliary linkers with different steric hindrance. Additionally, their luminescent properties are also observed. CCDC: 1019510, 1; 1019511, 2.