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Self‐Healing Behavior in a Thermo‐Mechanically Responsive Cocrystal during a Reversible Phase Transition
Author(s) -
Liu Guangfeng,
Liu Jie,
Ye Xin,
Nie Lina,
Gu Peiyang,
Tao Xutang,
Zhang Qichun
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.201609667
Subject(s) - differential scanning calorimetry , coronene , cocrystal , materials science , phase transition , stacking , crystallography , chemical physics , phase (matter) , crystal (programming language) , supramolecular chemistry , molecular dynamics , crystal structure , chemistry , molecule , thermodynamics , computational chemistry , hydrogen bond , physics , organic chemistry , computer science , programming language
The molecular‐level motions of a coronene‐based supramolecular rotator are amplified into macroscopic changes of crystals by co‐assembly of coronene and TCNB (1,2,4,5‐tetracyanobenzene) into a charge‐transfer complex. The as‐prepared cocrystals show remarkable self‐healing behavior and thermo‐mechanical responses during thermally‐induced reversible single‐crystal‐to‐single‐crystal (SCSC) phase transitions. Comprehensive analysis of the microscopic observations as well as differential scanning calorimetry (DSC) measurements and crystal habits reveal that a thermally‐reduced‐rate‐dependent dynamic character exists in the phase transition. The crystallographic studies show that the global similarity of the packing patterns of both phases with local differences, such as molecular stacking sequence and orientations, should be the origin of the self‐healing behavior of these crystals.