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Photochromism Dependent on Crystal Packing: Photoinduced and Thermal Proton‐Transfer Processes in Single Crystals of 6‐(2,4‐Dinitrobenzyl)‐2,2′‐Bipyridine
Author(s) -
Eichen Yoav,
Lehn JeanMarie,
Scherl Michael,
Haarer Dietrich,
Fischer Jean,
DeCian André,
Corval Anne,
Trommsdorff Hans Peter
Publication year - 1995
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199525301
Subject(s) - photochromism , photochemistry , molecule , 4,4' bipyridine , proton , crystallography , materials science , thermal , phase (matter) , bipyridine , crystal structure , chemistry , hydrogen bond , physics , organic chemistry , quantum mechanics , meteorology
Despite structural similarities, different photoreactivities are displayed by the two crystalline phases of 6‐(2,4‐dinitrobenzyl)‐2,2′‐bipyridine. Whereas one phase (the arrangement of the molecules in the unit cell of this phase is shown on the right) undergoes a photoinduced proton transfer process, the other is photoinert. Deuteration causes a marked increase in the lifetime of the colored phototautomer.