Metal ion sensors based on self-assembled monolayer anchored by tetradentate 6,6\u27-bis(benzimidazol-2-yl)-2,2\u27-bipyridine phosphonic acid on indium oxide doped-tin oxide (ITO) electrode
A novel tetradentate ligand, 6,6’-bis(1-hexylbenzimidazol-2-yl)-2,2’-bipyridine phosphonic acid (bhbbpa), was immobilized on an ITO electrode. Cyclic voltammetric measurements reveal that the anchored bhbbpa ligand can bind the metal ion such as Co2+ and Cu2+, which can be detected by the Co(II/III) or Cu(I/II) waves in the voltammograms. Furthermore, Cu2+ ion can be selectively attached to anchored dhbbda ligand in the presence of otherwise interfering ions such as Co2+ which can be probed by electrochemical measurements. Therefore, the bhbbpa immobilized ITO electrode can act as a metal ion selective sensor for Cu2+ ion.【査読有
