Title
Dynamic disorder in the crystal structure of an organic semiconductor : an unusual phase transition involving the heat capacity Dynamic disorder in the crystal structure of an organic semiconductor : an unusual phase transition involving the heat capacity
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Weinheim ,
Subject
Chemistry
Source (journal)
Chemistry: a European journal. - Weinheim
Volume/pages
17(2011) :3 , p. 912-919
ISSN
0947-6539
ISI
000287259700024
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
(E,E)-1-[2-(4-Nitrophenyl)ethenyl]-4-[2-(2,4-dimethoxyphenyl)ethenyl]benzene was characterised by X-ray diffraction and shown to be dynamically disordered at room temperature. The structure was re-determined over a range of temperatures to infer the thermodynamic parameters related to this disorder. A phase transition of third order according to the Ehrenfest classification scheme was discovered. To the best of our knowledge, this is the first experimentally observed phase transition of formal third order. It can be explained by the involvement of long-range lattice vibrations.
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