Science
J. Fraser Stoddart et al.
http://www.sciencemag.org.libproxy.mit.edu/content/339/6118/429.full.pdf
J. Fraser Stoddart et al.
http://www.sciencemag.org.libproxy.mit.edu/content/339/6118/429.full.pdf
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 was reported.
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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