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A New Photomagnetic Molecular System Based on Photoinduced Self‐Assembly of Radicals
Author(s) -
Ratera Imma,
RuizMolina Daniel,
VidalGancedo José,
Wurst Klaus,
Daro Nathalie,
Létard JeanFrançois,
Rovira Concepció,
Veciana Jaume
Publication year - 2001
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 - 10.1002/1521-3773(20010302)40:5<919::aid-anie919>3.0.co;2-g
Subject(s) - chemistry , isomerization , photochemistry , radical , singlet state , dimer , antiferromagnetism , schiff base , hydrogen bond , ground state , crystallography , excited state , molecule , catalysis , organic chemistry , physics , quantum mechanics , nuclear physics , condensed matter physics
An irreversible trans → cis isomerization of the imino group occurs during the irradiation of the new ferrocenyl Schiff‐base polychlorotriphenylmethyl radical 1 by light. Low‐temperature ESR investigations of frozen solutions revealed that the cis isomer exists as the ( cis ‐ 1 ) 2 dimer with strong antiferromagnetic interactions. The radical 1 constitutes an example of a one‐way photoswitchable magnetic system in which a conversion between a doublet and a singlet ground‐state species is promoted by a photoinduced self‐assembly process driven by the formation of hydrogen bonds.