Color Change ofN-Isopropylacrylamide Copolymer Bearing Reichardts Dye as Optical Sensor for Lower Critical Solution Temperature and for Host−Guest Interaction with β-Cyclodextrin

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Abstract

With a simple reaction pathway, a polymerizable solvatochromic dye monomer was synthesized. Copolymerization of this dye monomer with NiPAAM leads to formation of a solvatochromic copolymer with lower critical solution temperature (LCST) behavior. This resulting copolymer visualizes via a red-orange color change (a) the LCST phase transition and (b) the host−guest interaction of cyclodextrin with this copolymer simply by the naked eye. Actually, these effects are completely reversible.

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