Tunable magnetic circular dichroism via electrochemically controlled charge-transfer transition in Ru(bpy)_3~(2+) aqueous solution

摘要

Seeking potential aqueous solution with tunable magnetic properties by applied electrode potentials is an emerging research topic for the integration of aqueous solution into devices. In this work, Ru(bpy)_3~(2+), which is widely used for high efficiency electroluminescent and photovoltaic devices, has been demonstrated as a potential liquid electrolyte with tunable magnetic properties by applied electrode potentials evidenced by energy resolved magnetic circular dichroism (MCD) spectroscopy. The MCD signal at 450 nm transforms from paramagnetic to nonmagnetic behavior when the applied electrode potentials are ＞1.3V. The transition of the MCD signal from paramagnetic to nonmagnetic behavior is ascribed to the disappearance of metal to ligand charge transfer transition during the electrochemical oxidation process. This work might provide a valuable insight into exploration of functional liquid electrolyte with tunable opto-magnetic properties.