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Orthogonal Oriented Bisanthrancene‐Bridged Bis(Triarylamine) Diradical Dications: Isolation, Characterizations and Crystal Structures
Author(s) -
Wang Lei,
Zhang Li,
Fang Yong,
Zhao Yue,
Tan Gengwen,
Wang Xinping
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201801816
Subject(s) - diradical , dication , singlet state , moiety , density functional theory , superexchange , chemistry , materials science , crystallography , computational chemistry , molecule , excited state , stereochemistry , atomic physics , ion , physics , organic chemistry
Two bis(triarylamine) diradical dication salts 1 2+ 2[Al(OR F ) 4 ] − and 2 2+ 2[Al(OR F ) 4 ] − bridged with an orthogonal oriented bisanthrancene motif were synthesized. Their solid state and electronic structures were investigated by various experimental approaches in conjunction with theoretical calculations. Superconducting quantum interference device measurements and density functional theory calculations reveal that both of 1 2+ and 2 2+ feature open‐shell singlet ground states with rather small singlet‐triplet energy gaps; thus, they can be regarded as nearly pure diradicals (biradicals). Their diradical characters are enhanced by the orthogonal configuration of the bisanthrancene moiety which demonstrates the importance of the geometry of bridging units in turning the electronic structures of bis(triarylamine) dications.