Self-assembly of and charge transfer at N-docosyl-N '-methyl viologen on electrode surfaces

Self-assembled molecular films were formed on the electrode surfaces of gla ssy carbon (GC), platinum (Pt), gold, silver and indium-tin oxide in aqueou s electrolyte solutions of N-docosyl-N'-methyl viologen (C22VC1). The tempe rature dependence of voltammetric responses showed a higher stability with higher surface coverage and with a Pt than a GC surface. Charge transfer re actions of the solution redox species of Ru(NH3)(6)(3+) and Fe(CN)(6)(4-) a t the irreversibly self-assembled C22VC1\GC interface were found to take pl ace by an interplay of direct penetration of solution species through the s elf-assembled molecular layer of C22VC1 and of cross reaction between solut ion and surface bound redox agents. (C) 1999 Elsevier Science S.A. All righ ts reserved.