Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 31, Pages 10826-10829Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja500220j
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Funding
- Czech Science Foundation [13-19213S, 13-34168S]
- Academy of Sciences of the Czech Republic [RVO: 61388963]
- Operational Program Research and Development for Innovations [CZ. 1.05/3.2.00/08.0144]
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Two-step redox switching in enantiopure helquat system [P-1](2+) reversible arrow [P-1](center dot) reversible arrow [P-1](0) is demonstrated. The viologen-type electroactive unit embedded directly in the helical scaffold of 1 is responsible for the prominent chiroptical switching at 264 nm. This process is associated with a marked sign-reversal of Cotton effect ramping between Delta epsilon = +35 M-1 cm(-1) for [P-1](2+) and Delta epsilon = -100 M-1 cm(-1) for [P-1](0). This helically chiral system features the most intense chiroptical switch response documented in the field of helicenoids.
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