A one-dimensional co-based coordination polymer: Synthesis, crystal structure and nonenzymatic electrochemical sensing for glucose

Abstract

A new one-dimensional Co-based coordination polymer (CP), namely, [Co(Hbta²⁻)(L)] (Co-CP) (H₃bta = 1,3,5-benzenetricarboxylic acid and L = 4̕ -(4-(1H-imidazol-1-yl)phenyl)-2,2′:6–2″-terpyridine) was successfully prepared through the simple one-step solvothermal method. Co(II) is five-coordinated with two carboxylate oxygen atoms from two different Hbta²⁻ ligands and three nitrogen atoms from one L ligand. Hbta²⁻ and L coordinate with cobalt to form a one-dimensional chain by carboxyl groups bridging, and the one-dimensional chains interconnected by strong hydrogen bonding interactions to generate a two-dimensional layer, which is further extended by π-π stacking interactions into a three-dimensional supramolecular architecture. N-rich L ligands enhance the electrochemical properties of coordination polymer. Cyclic voltammetry (CV) and amperometric investigation exhibited that the Co-CP showed excellent nonenzymatic electrochemical sensing performance toward glucose. The Co-CP modified electrode offered a wide linear range from 20 μM to 19.7 mM in three segments and a low detection limit of 5 μM (S/N = 3). The electrochemical glucose sensor also exhibited excellent stability.