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A Supramolecular Ferroelectric Realized by Collective Proton Transfer
Author(s) -
Horiuchi Sachio,
Kumai Reiji,
Tokura Yoshinori
Publication year - 2007
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.200700407
Subject(s) - ferroelectricity , hydrogen bond , supramolecular chemistry , proton , polar , molecule , chemical polarity , materials science , crystallography , electric field , chemistry , chemical physics , organic chemistry , physics , optoelectronics , dielectric , quantum mechanics , astronomy
Cooperative crystals : In ferroelectric cocrystals of iodanilic acid (see picture, orange) and 5,5′‐dimethyl‐2,2′‐bipyridine (green), the molecules are linked into polar chains by OH⋅⋅⋅N and N + H⋅⋅⋅O − hydrogen bonds. The application of a small electric field ( E ) effects a cooperative proton transfer across the hydrogen bonds, which is accompanied by a reversal of the polarity ( P ).