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Intramolecular π‐Stacking Interactions of Bridged Bis‐ p ‐Phenylenediamine Radical Cations and Diradical Dications: Charge‐Transfer versus Spin‐Coupling
Author(s) -
Jalilov Almaz S.,
Nelsen Stephen F.,
Guzei Ilia A.,
Wu Qin
Publication year - 2011
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.201102629
Subject(s) - dication , diradical , chemistry , intramolecular force , stacking , tetracyanoethylene , crystallography , singlet state , photochemistry , ion , stereochemistry , atomic physics , excited state , physics , organic chemistry
Stacked against the odds : A bridged mixed‐valent compound with direct through‐space interactions between the charge‐bearing units in its singly charged paramagnetic and its doubly charged diamagnetic forms is isolated and characterized by X‐ray crystallography and spectroscopy (see scheme). π‐Stacking interactions for the singlet diradical dication were more pronounced than for the doublet monocation, despite the Coulomb repulsion effect in the diradical dication.