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Luminescence and structure of Eu(DBM)3Phen-doped vesicles composed of amphiphilic PNIPAM-b-PAzoM

Paper ID Volume ID Publish Year Pages File Format Full-Text
28976 44112 2008 5 PDF Available
Title
Luminescence and structure of Eu(DBM)3Phen-doped vesicles composed of amphiphilic PNIPAM-b-PAzoM
Abstract

Eu(DBM)3Phen-(DBM = dibenzoylmethide; Phen = 1,10-phenanthroline) doped vesicles were obtained through the self-assembly of poly (N-isopropylacrylamide)-b-poly{6-[4-(4-methylphenyl-azo) phenoxy] hexylacrylate} (PNIPAM-b-PAzoM) in the presence of Eu(DBM)3Phen in the H2O/THF solution (50/50 vol.%). When the water content of the vesicle solution increased from 50 vol.% to 98 vol.%, the characteristic luminescence of Eu(DBM)3Phen at 612 nm appeared. Moreover, with the increased water content, luminescence intensity gradually increased by about 200 times from 50 vol.% to 98 vol.% of the water content. A further detailed study on this phenomenon has shown that azobenzene units and Eu(DBM)3Phen were located in the shell of the vesicle, such that when more water was added into the solution, azobenzene units aggregated to a larger extent as demonstrated by their subsequent absorption-shift. From our results, we find that it is the more hydrophobic environment within the shell that has made the fluorescence of Eu(DBM)3Phen stronger. Such an environment hinders the interactions between water molecules and the complex. In this study, a model is presented for the azobenzene-containing vesicle in order to explain this phenomenon.

Keywords
PNIPAM-b-PAzoM, poly(N-isopropylacrylamide)-b-poly{6-[4-(4-methylphenyl-azo)phenoxy] hexylacrylate}; PNIPAM-SC(S)Ph, poly (N-isopropylacrylamide) capped with dithiobenzoate; PPDTB, 2-phenylprop-2-yl dithiobenzoate; THF, Eu(DBM)3Phen (DBM = dibenzoylmethid
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Luminescence and structure of Eu(DBM)3Phen-doped vesicles composed of amphiphilic PNIPAM-b-PAzoM
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 200, Issues 2–3, 15 December 2008, Pages 101–105
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