title: Color indicator for supramolecular polymer chemistry: phenolphthalein-containing thermo- and pH-sensitive N-(Isopropyl)acrylamide copolymers and β-cyclodextrin complexation.
abstract: The copolymerization parameters of N-(isopropyl)acrylamide (1) and N-(2-hydroxy-5-(1-(4-hydroxyphenyl)-3-oxo-1,3-dihydroisobenzofuran-1-yl)benzyl)acrylamide (2) are determined. For both monomers, the homoaddition proceeds slightly faster than the heteroaddition step; however, the polymer formation occurs in a statistic fashion. Copolymers of different compositions are prepared and the cloud points are determined. Thereby, a significant influence of the concentration of monomer 2 and the pH value is found. For the first time, the complexation of polymer attached phenolphthalein by β-cyclodextrins is shown. Furthermore, it is possible to achieve a decomplexation by the addition of suitable guest molecules. Both procedures can be followed with the naked eye.
authors.affiliation: Universitätsstr. 1, 40225 Düsseldorf, Germany.
authors.forename: Carolin
authors.initials: C
authors.lastname: Fleischmann
authors.forename: Helmut
authors.initials: H
authors.lastname: Ritter
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D003116:Color; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents / Q000138:chemical synthesis*; D020113:Phenolphthalein / Q000737:chemistry*; D058105:Polymerization; D013696:Temperature; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D000178:Acrylamides; D007202:Indicators and Reagents; D047392:beta-Cyclodextrins; D020113:Phenolphthalein; C067295:N-isopropylacrylamide
keywords: UV-vis spectroscopy; cyclodextrins; host-guest systems; polymer-attached phenolphthalein; turbidity measurements