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pH‐Switchable Through‐Space Interaction of Organic Radicals within a Self‐Assembled Coordination Cage
Author(s) -
Nakabayashi Koji,
Kawano Masaki,
Fujita Makoto
Publication year - 2005
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200501568
Subject(s) - radical , chemistry , protonation , yield (engineering) , cage , spins , space (punctuation) , spectroscopy , crystallography , organic chemistry , materials science , physics , computer science , condensed matter physics , ion , quantum mechanics , combinatorics , mathematics , metallurgy , operating system
Twinned spins yield triplets : The through‐space interaction of non‐associative stable organic radicals within a self‐assembled coordination cage (see scheme) is controlled by pH. The amino group of the radical can be protonated, and the affinity of the radicals for the host consequently decreases at low pH owing to coulombic repulsion. This leads to their release, as observed by ESR spectroscopy.