Metal‐ion sensor composed of self‐assembled monolayer of amine ligand formed by the use of molecular tripod

The electrochemical ion-sensor performance of the self-assembled monolayer (SAM) 3H-imidazo[4,5-b]pyridine, which is known as a metal ionophore, was examined using triad composed ferrocene, an and tripodal trithiol with adamantane core. voltammetry SAM-modified Au electrode showed large positive change (280 mV) in ferrocene oxidation potential via addition Pb2+, detection limit 10–6 M. A Langmuir adsorption-type analysis ion binding equilibrium suggested that much 70% imidazopyridine ligand actually functioning Pb2+ ionophore on SAM, whereas rest uncomplexed because crowding molecules SAM. Control experiments analogous monothiol revealed strong advantage trithiol; thus, tripod-shaped anchor requisite for to function well sensor.