American Chemical Society
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Ruthenium-Vinylhelicenes: Remote Metal-Based Enhancement and Redox Switching of the Chiroptical Properties of a Helicene Core

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posted on 2012-09-26, 00:00 authored by Emmanuel Anger, Monika Srebro, Nicolas Vanthuyne, Loïc Toupet, Stéphane Rigaut, Christian Roussel, Jochen Autschbach, Jeanne Crassous, Régis Réau
Introducing metal-vinyl ruthenium moieties onto [6]­helicene results in a significant enhancement of the chiroptical properties due to strong metal–ligand electronic interactions. The electro-active Ru centers allow the achievement of the first purely helicene-based redox-triggered chiroptical switches. A combination of electrochemical, spectroscopic, and theoretical techniques reveals that the helicene moiety is a noninnocent ligand bearing a significant spin density.