SYNTHESIS,PROPERTIES AND AN ELECTROACTIVE FILM OF RUTHENIUM(II) COMPLEXES WITH THE PYRIDINE DERIVATIVE LIGAND: trans-[RuCl2(pmp)4].(pmp=3-(PYRROL-1-YLMETHYL)PYRIDINE)

Abstract

In this work we report the synthesis, characterization and electrochemistry of the complex trans-[RuCl₂(pmp)₄], where pmp=3-(pyrrol-l-ylmethyl)pyridine. The complex was characterize by electronic spectroscopy (Λ_max = 404 nm and ε = 27000), vibrational FT-IR spectroscopy, ¹H and ¹³C NMR, showing results typically in agreement with trans geometry. Cyclic voltammetry reveals a redox process centered on the Ru(II) center (E^1/2 = 0.53V vs. NHE), which is electrochemically and chemically reversible. Spectroelectrochemistry shows the progressive disappearance of bands at 404 and 475 nm and the appearance of a new band at 302 nm during the oxidation process. Cyclic voltammetric experiments were performed to characterize the redox properties of the ruthenium complex; its electropolymerization produced a strongly adhesive conducting polymeric film on platinum and palladium electrodes.