TY - JOUR
T1 - A radically configurable six-state compound
AU - Barnes, Jonathan C.
AU - Fahrenbach, Albert C.
AU - Cao, Dennis
AU - Dyar, Scott M.
AU - Frasconi, Marco
AU - Giesener, Marc A.
AU - Benítez, Diego
AU - Tkatchouk, Ekaterina
AU - Chernyashevskyy, Oleksandr
AU - Shin, Weon Ho
AU - Li, Hao
AU - Sampath, Srinivasan
AU - Stern, Charlotte L.
AU - Sarjeant, Amy A.
AU - Hartlieb, Karel J.
AU - Liu, Zhichang
AU - Carmieli, Raanan
AU - Botros, Youssry Y.
AU - Choi, Jang Wook
AU - Slawin, Alexandra M.Z.
AU - Ketterson, John B.
AU - Wasielewski, Michael R.
AU - Goddard, William A.
AU - Stoddart, J. Fraser
PY - 2013/1/25
Y1 - 2013/1/25
N2 - 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.
AB - 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.
U2 - 10.1126/science.1228429
DO - 10.1126/science.1228429
M3 - Article
AN - SCOPUS:84872773951
SN - 0036-8075
VL - 339
SP - 429
EP - 433
JO - Science
JF - Science
IS - 6118
ER -