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- Title
Redox‐Active Chiroptical Switching in Mono‐ and Bis‐Iron Ethynylcarbo[6]helicenes Studied by Electronic and Vibrational Circular Dichroism and Resonance Raman Optical Activity.
- Authors
Shen, Chengshuo; Srebro‐Hooper, Monika; Weymuth, Thomas; Krausbeck, Florian; Navarrete, Juan T. López; Ramírez, Francisco J.; Nieto‐Ortega, Belén; Casado, Juan; Reiher, Markus; Autschbach, Jochen; Crassous, Jeanne
- 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. Ironing in kinks: Introducing one or two alkynyl–iron moieties onto a carbo[6]helicene results in organometallic helicenes that display strong chiroptical activity combined with efficient redox‐triggered switching (see figure). The chiroptical properties and redox‐switching activity of iron alkynylhelicenes determined experimentally and theoretically are reported.
- Subjects
ORGANOMETALLIC compounds; OXIDATION-reduction reaction; CHIRALITY; HELICENES; VIBRATIONAL circular dichroism; RESONANCE Raman spectroscopy
- Publication
Chemistry - A European Journal, 2018, Vol 24, Issue 56, p15067
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201803069