Journal
POLYMER BULLETIN
Volume 59, Issue 4, Pages 537-544Publisher
SPRINGER
DOI: 10.1007/s00289-007-0789-2
Keywords
Cyclodextrin; Azo-polymer; Photoisomerization
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The effect of alpha-cyclodextrin (alpha-CD) on the trans-cis photoisomerization of an azobenzene functionalized polymer (AZO-HPMC) in aqueous solutions has been systematically studied. It has been shown that the cis fraction at the photostationary states and the photoisomerization rate constant increases with increasing alpha-CD concentration, indicating that the trans-cis photoisomerization of AZO-HPMC is accelerated by addition of alpha-CD. This behavior is interpreted in terms of the aggregation between the azobenzene groups. The formation of inclusion complexes between the trans isomers and alpha-CD inhibits the aggregation and consequently increases the mobility and free volume for the isomerization.
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