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Photochromic Properties of Perhydro‐ and Perfluorodithienylcyclopentene Molecular Switches
Author(s) -
Jong Jaap J. D. de,
Lucas Linda N.,
Hania Ralph,
Pugzlys Audrius,
Kellogg Richard M.,
Feringa Ben L.,
Duppen Koos,
Esch Jan H. van
Publication year - 2003
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.200200719
Subject(s) - photochromism , chemistry , cyclopentene , solvatochromism , substituent , thermal stability , molecular switch , photochemistry , absorption (acoustics) , absorption spectroscopy , computational chemistry , molecule , organic chemistry , optics , catalysis , physics
Various substituted phenylthienyl perhydro‐ and perfluorocyclopentenes have been synthesized in order to compare their spectroscopic and photochromic properties. The difference in the electron densities of the central cyclopentene moieties in the perhydrocyclopentene and perfluorocyclopentene molecular switches has only a small effect on the absorption maxima of the electronic spectra, but causes some subtle changes in substituent and solvatochromic effects. The photochromic behaviour is remarkably similar, and both type of switches combine excellent quantum yields (0.6) with high degrees of photoconversion (> 0.85). The main difference is the lower photochemical and thermal stability of the perhydrocyclopentene molecular switches. It is concluded that in most studies the perhydrocyclopentenes are an excellent alternative for the perfluorocyclopentenes, while the perfluorocyclopentenes might be better suited for applications such as data storage, which depend critically on fatigue resistance and thermal stability. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)