The 1D chain coordination polymer [Co(dca) 2 (4-bpmp) 2 (H 2 O) 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 2 5 2 6 2 )(4 2 5 6 6 4 7 3 ) topology.