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Electrochemical assembly of[Ru(bpy)_2dppz]~(2+){bpy=2,2’-bipyridine,dppz=dipyrido[3,2-a:2’,3’-c]phenazine} on an ITO electrode in the presence of guanine and photoelectrochemical properties of the assembled layer were investigated.It has been found that[Ru(bpy)_2dppz]~(3+/2+) can be assembled onto the ITO electrode by the method of repetitive voltammetric sweeping,and the assembly is enhanced by guanine.The peak currents of prewaves increase linearly up to a guanine concentration of 0.25 mmol/L.More importantly,upon illumination with 470 nm light source and at an applied potential of 0.2 V,cathodic current for the fabricated layer on the ITO electrode indicate a linear enhancement with the rise of guanine concentration.Meanwhile,[Ru(bpy)_2dppz]~(2+) can be served as an excellent mediator to prompt the oxidation of guanine,and the mediated peak current increases linearly with added guanine concentration from 0.01 to 0.25 mmol/L.In addition,the assembly mechanism of[Ru(bpy)_2dppz]~(2+) on the ITO electrode associated with the oxidation of guanine and the assistance of light irradiation were discussed.
Electrochemical assembly of [Ru (bpy) _2dppz] ~ (2 +) {bpy = 2,2’-bipyridine, dppz = dipyrido [3,2-a: 2 ’, 3’-c] phenazine} on an ITO electrode in the presence of guanine and photoelectrochemical properties of the assembled layer were investigated. It has been found that [Ru (bpy) _2dppz] ~ (3 + / 2 +) can be assembled onto the ITO electrode by the method of repetitive voltammetric sweeping, and the assembly is enhanced by guanine.The peak currents of prewaves increase linearly up to a guanine concentration of 0.25 mmol / L.More importantly, upon illumination with 470 nm light source and at an applied potential of 0.2 V, cathodic current for the fabricated layer on the ITO electrode indicates a linear enhancement with the rise of guanine concentration. However, [Ru (bpy) _2dppz] ~ (2+) can be served as an excellent mediator to prompt the oxidation of guanine, and the mediated peak current increases linearly with added guanine concentration from 0.01 to 0.25 mmol / L.In addition, the assembly mechanism of [Ru (bpy) _2dppz] ~ (2+) o n the ITO electrode associated with the oxidation of guanine and the assistance of light irradiation were discussed.