Journal
SCIENCE
Volume 339, Issue 6118, Pages 429-433Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1228429
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Funding
- Non-Equilibrium Energy Research Center, Energy Frontier Research Center (EFRC)
- U.S. Department of Energy, Office of Basic Energy Sciences (DOE-BES) [DESC0000989]
- Argonne-Northwestern Solar Energy Research Center, EFRC
- DOE-BES [DE-SC0001059]
- U.S. National Science Foundation [CHE-1012378]
- National Defense Science and Engineering Graduate Fellowship from the U.S. Department of Defense (DOD)
- Ryan Fellowship under Northwestern University International Institute for Nanotechnology
- DOD [W911NF-10-1-0510]
- National Science Foundation
- American Chemical Society
- Focus Center Research Program Center on Functional Engineered Nano Architectonics
- NSF [CHE-0924620]
- Engineering and Physical Sciences Research Council [EP/H003517/1]
- World Class University [R-31-2008-000-10055-0]
- Ministry of Education, Science and Technology, Republic of Korea
- Ministry of Science, ICT & Future Planning, Republic of Korea [N01130014, KINC02] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [R31-2012-000-10055-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- EPSRC [EP/H003517/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H003517/1] Funding Source: researchfish
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1012378] Funding Source: National Science Foundation
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Most organic radicals possess short lifetimes and quickly undergo dimerization or oxidation. Here, we report on the synthesis by radical templation of a class of air- and water-stable organic radicals, trapped within a homo[2]catenane composed of two rigid and fixed cyclobis (paraquat-p-phenylene) rings. The highly energetic octacationic homo[2] catenane, which is capable of accepting up to eight electrons, can be configured reversibly, both chemically and electrochemically, between each one of six experimentally accessible redox states (0, 2+, 4+, 6+, 7+, and 8+) from within the total of nine states evaluated by quantum mechanical methods. All six of the observable redox states have been identified by electrochemical techniques, three (4+, 6+, and 7+) have been characterized by x-ray crystallography, four (4+, 6+, 7+, and 8+) by electron paramagnetic resonance spectroscopy, one (7+) by superconducting quantum interference device magnetometry, and one (8+) by nuclear magnetic resonance spectroscopy.
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