fulltext.study @t Gmail

Synthesis, properties and fluorescence quenching in a polycation based on polyetherurethane with pyrene fluorophore

Paper ID Volume ID Publish Year Pages File Format Full-Text
28624 44082 2006 7 PDF Available
Title
Synthesis, properties and fluorescence quenching in a polycation based on polyetherurethane with pyrene fluorophore
Abstract

A soft polyurethane based on poly(tetramethylene oxide) diol, 4,4′-diphenylmethane diisocyanate (MDI) and N-methyldiethanol amine partially quaternized with 4-chloromethylphenylcarbamoyl-1-oxymethylpyrene was prepared and characterized using spectral and thermal methods. The content of pyrene attached to the polyurethane backbone is of 10.9 wt.% polymer. The structure of the nanophase separated domains in the corresponding polymeric film was visualized using topographical information from atomic force microscope (AFM) image. The solution properties of this polymer have been studied by fluorescence spectroscopy in tandem with the quenching of fluorescence in the pyrene–polyurethane by nitrobenzene used as efficient quencher under a concentration of about 9.65 × 10−4 M. Even more interestingly, a substantial quenching was observed for such polymer in the thin film exposed to the saturated vapors of nitrobenzene as result of the formation of complex between the excited pyrene molecule (electron donor) and nitrobenzene (electron acceptor). Moreover, the fluorescence recovery from the polymeric film occurred after 80 min of standing in a clean atmosphere. Because these films may be readily over coated with other films of varying thickness and composition, it should be possible to develop a variety of vapor-based “chemical” sensors for the detection of chemical analytics.

Keywords
Pyrene polycation; PU ionomers; Fluorescence; Nitrobenzene quencher; Film quenching
First Page Preview
Synthesis, properties and fluorescence quenching in a polycation based on polyetherurethane with pyrene fluorophore
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 180, Issues 1–2, 15 May 2006, Pages 150–156
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us