Electropolymerization of trans-[RuCl2(vpy)4] complex—EQCM and Raman studies

摘要: The electropolymerization of trans-[RuCl2(vpy)4] (vpy=4-vinylpyridine) on Au or Pt electrodes was studied by cyclic voltammetry, electrochemical quartz crystal microbalance (EQCM) technique, and Raman spectroscopy. Cyclic voltammetry the monomer at a microelectrode shows typical Ru(III/II) Ru(IV/III) waves, together with vinyl reduction waves −1.5 −2.45 V adsorption wave −0.8 V. Electrodeposition EQCM technique performed under potential cycling between −0.9 −2.0 V revealed that polymerization proceeded well in advance waves. At potentials more positive than −0.9 V, soluble oligomers were deposited irreversibly electrode during oxidative sweep. film also showed reversible mass changes due to oxidation accompanying ingress charge-balancing anions solvent into film. In contrast, potentiostatic growth polymer −1.6 V slower because oligomeric material lost completely from electrode. Unreacted groups detected situ spectroscopy for films grown −0.7, −0.9, but absent when carried out −2.9 V vs Ag/Ag+.