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A Stable, Soluble, and Crystalline Supramolecular System with a Triplet Ground State
Author(s) -
Futagoishi Tsukasa,
Aharen Tomoko,
Kato Tatsuhisa,
Kato Azusa,
Ihara Toshiyuki,
Tada Tomofumi,
Murata Michihisa,
Wakamiya Atsushi,
Kageyama Hiroshi,
Kanemitsu Yoshihiko,
Murata Yasujiro
Publication year - 2017
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.201701212
Subject(s) - phosphorescence , supramolecular chemistry , antiferromagnetism , crystallography , ground state , triplet state , chemistry , fullerene , paramagnetism , electron paramagnetic resonance , molecule , photochemistry , materials science , crystal structure , nuclear magnetic resonance , fluorescence , condensed matter physics , atomic physics , optics , physics , organic chemistry
A supramolecular complex was constructed by encapsulation of a 3 O 2 molecule inside an open‐cage C 60 derivative. Its single‐crystal X‐ray diffraction analysis revealed the presence of the 3 O 2 at the center of the fullerene cage. The CV measurements suggested that unprecedented dehydrogenation was promoted by the encapsulated 3 O 2 after two‐electron reduction. The ESR measurements displayed the triplet character as well as the anisotropy of the 3 O 2 . Additionally, the SQUID measurements also demonstrated the paramagnetic behavior above 3 K without an antiferromagnetic transition. Upon photoirradiation with visible light, three phosphorescent bands at the NIR region were observed, arising from the exited 1 O 2 generated by self‐sensitization with the outer cage, whose lifetimes were not affected by the environments. These studies confirmed that the complex is a crystalline triplet system with incompatible “high spin density” but “small interspin interaction” properties.