%0 Journal Article
%T Cyclodextrin-induced host¨Cguest effects of classically prepared poly(NIPAM) bearing azo-dye end groups
%A Gero Maatz
%A Arkadius Maciollek
%A Helmut Ritter
%J Beilstein Journal of Organic Chemistry
%D 2012
%I 
%R 10.3762/bjoc.8.224
%X A thermo-, pH- and cyclodextrin- (CD) responsive poly(N-isopropylacrylamide) (PNIPAM), with a N,N-dimethylaminoazobenzene end group was synthesized. Using 3-mercaptopropionic acid as a chain transfer agent, PNIPAM with a well-defined COOH end group was obtained. The acid end group was transferred to the corresponding acid chloride and then functionalized with N,N-dimethyl[4-(4ˇŻ-aminophenylazo)phenyl]amine. This dye-end-group-labeled polymer showed acidochromic effects, depending on the pH and the presence of randomly methylated ¦Â-cyclodextrin (RAMEB-CD). Also higher cloud-point values for the lower critical solution temperature (LCST) in the presence of RAMEB-CD were observed. Additionally, this azo-dye-end-group-labeled polymer was complexed with hyperbranched polyglycerol (HPG) decorated with ¦Â-CD to generate hedgehog-like superstructures.
%K azo-dye
%K cyclodextrins
%K end-group functionalization
%K host¨Cguest interaction
%K supramolecular aggregation
%U http://dx.doi.org/10.3762/bjoc.8.224