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Photoswitchable Association of an Azobenzne–Bipyridinium Diad to Eosin: Photostimulated “On‐Off” Guest Binding
Author(s) -
Willner Itamar,
Marx Sharon,
Eichen Yoav
Publication year - 1992
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.199212431
Subject(s) - azobenzene , isomerization , diad , dissociation (chemistry) , chemistry , eosin , molecular switch , photochemistry , molecule , organic chemistry , polymer , medicine , staining , pathology , copolymer , catalysis
The reversible photoinduced cis–trans isomerization of the azobenzene unit in 1 , together with the distinctly different association constants of the cis and trans isomers for the binding of 1 to eosin Y ( 2 , K = 38 000 and 3000 M −1 1, respectively) can be utilized to construct a molecular switch for the formation and dissociation of the complex between 1 and 2 that is light‐controlled. Such photo‐switchable units are important in information storage systems and signal processing on the molecular level.