Electrocatalytic properties of guanine, adenine, guanosine-5′-monophosphate, and ssDNA by Fe(II) bis(2,2′:6′,2″-terpyridine), Fe(II) tris(1,10-phenanthroline), and poly-Fe(II) tris(5-amino-1,10-phenanthroline)

The electrocatalytic oxidations of guanine, adenine, guanosine-5′-monophosphate(GMP) and ssDNA were performed in the presence of Fe(II) bis(2,2′:6′,2″-terpyridine) and Fe(II) tris(1,10-phenanthroline) complexes as homogeneous catalysts by cyclic voltammetric methods. The Fe(II/III) redox couple of these compounds is responsible for their catalytic properties. The electrocatalytic oxidation current of above substrates were developed from the anodic peak currents of Fe(II) bis(2,2′:6′,2″-terpyridine) and Fe(II) tris(1,10-phenanthroline) complexes at about + 0.93 V and 0.97 V, respectively. The electrocatalytic oxidative properties of guanine by Fe(II) bis(2,2′:6′,2″-terpyridine) complex was measured by amperometry method using the rotating disk electrodes. Electropolymerization of Fe(II) tris(5-amino-1,10-phenanthroline) complex produced thin polymer films on gold and glassy carbon electrodes. The electrochemical quartz crystal microbalance (EQCM) and cyclic voltammetry were used to study the in situ growth of the polymer. The poly(FeII(5-NH₂-1,10-phen)₃) exhibited a good electrocatalytic oxidation towards guanine and also for the mixture of guanine and adenine too.