Redox-active Chiroptical Switching in Mono- and Bis-Iron-Ethynyl-Carbo[6]Helicenes Studied by Electronic and Vibrational Circular Dichroism and Resonance Raman Optical Activity

Abstract : Introducing one or two alkynyl-iron moieties onto a carbo[6]helicene results in organometallic helicenes (2 a,b) that display strong chiroptical activity combined with efficient redox-triggered switching. The neutral and oxidized forms have been studied in detail by electronic and vibrational circular dichroism, as well as by Raman optical activity (ROA) spectroscopy. The experimental results were analyzed and spectra were assigned with the help of first-principles calculations. In particular, a recently developed method for ROA calculations under resonance conditions has been used to study the intricate resonance effects on the ROA spectrum of mono-iron ethynylhelicene 2 a.
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Chengshuo Shen, Monika Srebro-Hooper, Florian Krausbeck, Thomas Weymuth, Juan López Navarrete, et al.. Redox-active Chiroptical Switching in Mono- and Bis-Iron-Ethynyl-Carbo[6]Helicenes Studied by Electronic and Vibrational Circular Dichroism and Resonance Raman Optical Activity. Chemistry - A European Journal, Wiley-VCH Verlag, 2018, 24 (56), pp.15067-15079. ⟨10.1002/chem.201803069⟩. ⟨hal-01862498⟩

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