Synthesis, Structures, and Characterization of Two d10 Metal Coordination Polymers With a Flexible Bis(triazole) Ligand

Abstract

Two d10 metal coordination polymers, {[Zn(mbtz)(HBTC)]·(H2O)0.5}n (1) and {[Cd(mbtz)(HO−BDC)(H2O)]}n (2) (mbtz = 1,3-bis(1,2,4-triazol-1-ylmethyl)benzene, H3BTC = 1,3,5-benzenetricarboxylic acid, and HO−H2BDC=5-hydroxy-isophthalic acid), have been hydrothermally synthesized and characterized. 1 exhibits a one-dimensional (1D) loop-like chain structure, each Zn(II) ion is coordinated by two triazole nitrogen atoms derived from two mbtz ligands and two oxygen atom from two distinct HBTC2−. While 2 displays a two-dimensional (2D) undulated (4,4) network constructed with mbtz and HO−BDC2− bridging ligands, each Cd(II) ion has distorted octahedral coordination geometry. Furthermore, both the coordination polymers extend to three-dimensional (3D) supramolecular net via hydrogen-bonding interactions, but different framework topologies. Complex 1 is a rare type of binodal (4,5)-connected topology with a point symbol of {3.42.65.82}{32.6.72.8}, while 2 is a trinodal (3,5,6)-connected topology, and the point symbol of the net is {3.5.6}{32.52.68.73}{52.66.82}.