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Design, synthesis and photophysics o...

Fan, Li-juan.

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Design, synthesis and photophysics of fluorescence "turn-on" conjugated polymer chemosensors.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Design, synthesis and photophysics of fluorescence "turn-on" conjugated polymer chemosensors./
Author:	Fan, Li-juan.
Description:	181 p.
Notes:	Adviser: Wayne E. Jones, Jr.
Contained By:	Dissertation Abstracts International67-04B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3214759
ISBN:	9780542644191

Design, synthesis and photophysics of fluorescence "turn-on" conjugated polymer chemosensors.
Fan, Li-juan.

Design, synthesis and photophysics of fluorescence "turn-on" conjugated polymer chemosensors. - 181 p.

Adviser: Wayne E. Jones, Jr.

Thesis (Ph.D.)--State University of New York at Binghamton, 2006.

This dissertation explores the synthesis, characterization, and application of conjugated polymers as fluorescence "turn-on" chemosensors. A series of conjugated polymers using the poly[p-(phenyleneethynelene)-alt-(thienylene-ethylene)](PPETE) polymer backbone were prepared using N,N-diethylamino (dea) and N,N,N'-trimethylethylenediamino (tmeda) groups as receptors. The conjugated polymers were designed as fluorescence "turn-on" chemosensors based on a photoinduced electron transfer (PET) mechanism in which the polymer fluorescence is quenched in the absence of coordinating analytes. A chelation-enhanced fluorescence (CHEF) phenomenon results upon coordination of a cation to the redox active receptor as a result of termination of the fluorophore quenching process. The polymers were fully characterizated by NMR, FTIR, Gel Permeation Chromatography (GPC) and elemental analysis.

ISBN: 9780542644191Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Design, synthesis and photophysics of fluorescence "turn-on" conjugated polymer chemosensors.
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100 1 $a Fan, Li-juan. $3 1291831
245 1 0 $a Design, synthesis and photophysics of fluorescence "turn-on" conjugated polymer chemosensors.
300 $a 181 p.
500 $a Adviser: Wayne E. Jones, Jr.
500 $a Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 2022.
502 $a Thesis (Ph.D.)--State University of New York at Binghamton, 2006.
520 $a This dissertation explores the synthesis, characterization, and application of conjugated polymers as fluorescence "turn-on" chemosensors. A series of conjugated polymers using the poly[p-(phenyleneethynelene)-alt-(thienylene-ethylene)](PPETE) polymer backbone were prepared using N,N-diethylamino (dea) and N,N,N'-trimethylethylenediamino (tmeda) groups as receptors. The conjugated polymers were designed as fluorescence "turn-on" chemosensors based on a photoinduced electron transfer (PET) mechanism in which the polymer fluorescence is quenched in the absence of coordinating analytes. A chelation-enhanced fluorescence (CHEF) phenomenon results upon coordination of a cation to the redox active receptor as a result of termination of the fluorophore quenching process. The polymers were fully characterizated by NMR, FTIR, Gel Permeation Chromatography (GPC) and elemental analysis.
520 $a Detailed photophysical studies of dea-PPETE and tmeda-PPETE demonstrated relatively weak emission at lambdamax = 488 nm with quantum yields of 0.11 and 0.09. Room temperature emission studies show that tmeda-PPETE exhibited a fluorescence "turn-on" response in the presence of many cations at less than 500 nM concentrations. For example, Hg2+ in aqueous solution causes the fluorescence of tmeda-PPETE to increase by a factor of 2.7 at less than millimolar concentrations. This represents the first example of a conjugated polymer applied as a fluorescence "turn-on" chemosensor based on the PET mechanism.
520 $a The competitive role of PET and energy migration is critical to sensor function. This was investigated by synthesizing a series of PPETE's with different amino receptor loadings. Theoretical and experimental studies revealed that the limited sensitivity achieved in this system may be attributed to relatively slow energy migration (<109s-1) along the polymer backbone relative to the emissive lifetime (&sim;10-10s).
520 $a A highly selective and sensitive sensory system towards iron cations in solution was achieved by preparing a transition metal derivatized conjugated polymer based on Cu2+ quenching. By preloading Cu2+ onto the receptor of tmeda-PPETE, fluorescence enhancements of 150 fold were achieved in the presence of 10 micromolar of iron cations. The combination of the conjugated polymer and metal cation created a selective sensor and offers a new paradigm for further sensor design.
590 $a School code: 0792.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 0 $a State University of New York at Binghamton. $3 737493
773 0 $t Dissertation Abstracts International $g 67-04B.
790 $a 0792
790 1 0 $a Jones, Wayne E., Jr., $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3214759