Synthesis and structure of a cobalt dicyanamide chain coordination polymer incorporating a long-spanning hydrogen-bonding capable diimine with a novel binodal (4,6)-connected supramolecular topology

Abstract

The 1D chain coordination polymer [Co(dca) 2(4-bpmp) 2(H 2O) 2] n ( 1, dca = dicyanamide, 4-bpmp = bis(4-pyridylmethyl)piperazine) has been prepared by a solution phase method and characterized by single-crystal X-ray diffraction, IR and elemental analysis. The dca ligand adopts a relatively uncommon monodentate binding mode. Interchain hydrogen-bonding mechanisms between the unligated nitrogen atoms of the pendant dca ligands and aqua ligands promote formation of a sawtooth (4,4) supramolecular layer. In turn, hydrogen-bonding interactions between aqua ligands and piperazinyl nitrogen atoms within the 4-bpmp tethers result in a simple yet unique (4,6)-connected supramolecular network with (4 25 26 2)(4 25 66 47 3) topology.