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Elastically Flexible Crystals have Disparate Mechanisms of Molecular Movement Induced by Strain and Heat
Author(s) -
Brock Aidan J.,
Whittaker Jacob J.,
Powell Joshua A.,
Pfrunder Michael C.,
Grosjean Arnaud,
Parsons Simon,
McMurtrie John C.,
Clegg Jack K.
Publication year - 2018
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.201806431
Subject(s) - intermolecular force , bending , molecule , chemical physics , mechanism (biology) , materials science , crystallography , rotation (mathematics) , crystal (programming language) , thermal expansion , thermal , molecular dynamics , strain (injury) , thermal motion , crystal structure , copper , orientation (vector space) , chemistry , composite material , computational chemistry , thermodynamics , physics , geometry , medicine , mathematics , organic chemistry , quantum mechanics , computer science , metallurgy , programming language
Elastically flexible crystals form an emerging class of materials that exhibit a range of notable properties. The mechanism of thermal expansion in flexible crystals of bis(acetylacetonato)copper(II) is compared with the mechanism of molecular motion induced by bending and it is demonstrated that the two mechanisms are distinct. Upon bending, individual molecules within the crystal structure reversibly rotate, while thermal expansion results predominantly in an increase in intermolecular separations with only minor changes to molecular orientation through rotation.