Coordination Polymerswith Bulky Bis(imidazole) andAromatic Carboxylate Ligands: Diversity in Metal-Containing Nodesand Three-Dimensional Net Topologies.

Five new three-dimensional transition metal coordinationpolymers(CPs) with dia and different aromatic carboxylates, [Cd(oba)(dia)0.5] (1), [Cd(Hbtc)(dia)]·3H2O(2), and [M3(2-stp)2(dia)6(H2O)2] (3a, M = Cd; 3b, M = Co; 3c, M = Ni) were synthesized under hydrothermalcondition (dia = 9,10-di(1H-imidazol-1-yl)anthracene;oba = 4,4′-oxybis(benzoate); btc = benzene-1,3,5-tricarboxylate;2-stp = 2-sulfoterephthalate). Compounds 3a–care isostructural. The coordination geometries at cadmiumin 1, 2, and 3aare cappedtrigonal prism, pentagonal bipyramid, and octahedron, respectively.This diversity in coordination geometry is in sharp contrast to 3cand previously reported nickel complexes of a similar ligandset. The difference in metal-containing node geometries and carboxylatestructures results in diverse network connectivity, including a tcstopology for 1, an unprecedented binodaltopology of (42.63.85)(42.6) for 2, and a rare trinodal topology of (4.64.8)2(43.63)2(44.610.8) for 3. Based on secondarybuilding units, the networks in 2and 3canbe, alternatively, described as roband pcu(or ilc) nets, respectively. This work shows the effectof the specific ion and the rich potential of using bulky bis(imidazole)and aromatic carboxylate as ligands in the construction of CPs withunusual topologies. [ABSTRACT FROM AUTHOR]