POLY 455 |
| We successfully polymerized the phenylacetylene with the urea derivative of L-leucinethe (1) to afford cis-poly(phenylacetylene) bearing the urea derivative of L-leucine as pendant (2). Polymer 2 showed a distinct Cotton effect in the range from 280 nm to 520 nm due to the absorption of the polymer backbone, demonstrating that 2 possessed a one-handed helical screw sense. The CD and absorption spectra of 2 in the presence of the tetra-n-butylammonium nitrate (TBAN), hydrosulfate (TBAHS), fluoride (TBAF), and acetate (TBAA) showed a characteristic spectral pattern, so that 2 was applicable for the selective detection of anionic species. Especially for TBAA, the helical pitch of 2 was drastically changed through the strong host-guest complexation of urea with the acetate anion, which realized the selective and visible sensing of carboxylate anion. This is the first demonstration of an anion sensor utilizing a combination of poly(phenylacetylene) and host-guest chemistry. |
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Conjugated Polymer Materials and Hybrids: Synthesis, Macromolecular Assemblies, and Nanostructures
6:00 PM-8:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Polymer Chemistry |