ORGN 354 |
| Matthew F. L. Parker, Clifford B. Murphy, Brendan R. Flynn, Kamal Talati, and Wayne E. Jones Jr. Department of Chemisty, Institute for Materials Research, and Center for Research on Environmental Systems, State University of New York, Vestal Parkway East, Binghamton, NY 13902 |
| Phenyleneethynylene-thiopheneethynylene polymers (PPETE) possessing an oligopyridine pendant group have previously been prepared and demonstrated to behave as chemosensors for transition metal cations. Building on the flexibility of the [A-B-X] model of these polymers, structural alterations have been made to the backbone and pendant receptors. Multiple, specific variations have recently been used to explore the enhanced sensitivity observed. A key component of this effort was to alter the morphology of the polymer from a random coil to a rigid rod. To achieve this, a para-substituted phenylene monomer was employed in place of the previously used thiophene, which exhibits a 143o distortion, as the linker between the receptor and the backbone. For this example, the rigid rod polymer exhibits interesting variations in sensitivity as well as directly changing the selectivity to different metal analytes. The absorbance maximum for this new breed of polymeric chemosensor is at 400 nm and the emission maximum is at 510 nm, both of which are blue shifted from the PPETE series of polymers. Here we report the details of the impact of these structural alterations on sensitivity and selectivity. |
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Physical Organic, Combinatorial, Materials, Molecular Recognition
8:00 PM-10:00 PM, Tuesday, March 30, 2004 Anaheim Convention Center -- Hall A, Poster
Division of Organic Chemistry |