TY - JOUR
T1 - Photoresponsive lower-rim azobenzene substituted and bridged calix[4]arenes
AU - Vögtle, Fritz
AU - Udelhofen, Dirk
AU - Abramson, Sarah
AU - Fuchs, Benzion
N1 - Funding Information:
Support for this work was provided by the Fonds der Chemischen Industrie (to F.V.) and by the Israel Science Foundation (to B.F.).
PY - 2000/2/29
Y1 - 2000/2/29
N2 - The doubly azobenzene-chain lower-rim substituted calix[4]arenes 6-9 were prepared, followed by the doubly bridged biscalix[4]arenes 10 and 11. All are photoresponsive and detailed studies of the E⇌Z photoisomerization and the Z→E thermal isomerization in 6 and 10 were carried out using UV and 1H NMR spectroscopic techniques. The three (EE, EZ and ZZ) isomers of 6 and 10 were isolated or enriched and fully characterized by 1H NMR. Kinetic analyses of these transformations of 6 were carried out and revealed a concentration dependent behavior and an interesting sequential course of its photoisomerization.
AB - The doubly azobenzene-chain lower-rim substituted calix[4]arenes 6-9 were prepared, followed by the doubly bridged biscalix[4]arenes 10 and 11. All are photoresponsive and detailed studies of the E⇌Z photoisomerization and the Z→E thermal isomerization in 6 and 10 were carried out using UV and 1H NMR spectroscopic techniques. The three (EE, EZ and ZZ) isomers of 6 and 10 were isolated or enriched and fully characterized by 1H NMR. Kinetic analyses of these transformations of 6 were carried out and revealed a concentration dependent behavior and an interesting sequential course of its photoisomerization.
KW - Azobenzene
KW - Bridged calixarenes
KW - Photoisomerization
KW - Supramolecular chemistry
UR - http://www.scopus.com/inward/record.url?scp=0041724966&partnerID=8YFLogxK
U2 - 10.1016/S1010-6030(99)00228-2
DO - 10.1016/S1010-6030(99)00228-2
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AN - SCOPUS:0041724966
SN - 1010-6030
VL - 131
SP - 41
EP - 48
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 1-3
ER -