Electron-Transfer Kinetics in Polymetallic Carbon-Rich Ruthenium(II) Bis(σ-arylacetylides) Wires Connected to Gold
Abstract
Mol. wires consisting of RuII bis(σ-arylacetylide) organometallics functionalized with different anchoring groups (thiol, isocyanide) connected with different bridges [O, [n.63743]CH2[n.63743], [n.63743]O[n.63743](CH2)6[n.63743]] were self-assembled onto gold surfaces. The materials were characterized through wettability, ellipsometric, IR absorption reflection, and electrochem. measurements. The dynamics of the electron transfers within the monolayers were examd. with high-speed voltammetry. Similar fast electron-transfer dynamics (104 s-1) assocd. with discrete oxidn. events (up to four distinct oxidn. states) at remarkably low potentials (≤0.7 V vs. SCE) were obsd. for all complexes. Neither the extension of the mol. wires, nor the variation in the anchoring/bridging units, led to the decrease in electron-transfer kinetics. These results highlight the potential of RuII bis(σ-arylacetylide) complexes as a charge-storage medium for processing information in multibit devices with low power consumption.