ISSN:
0887-624X
Keywords:
amphiphilic polyelectrolytes
;
naphthalene
;
pyrene
;
fluorescence
;
excimer
;
energy migration
;
fluorescence quenching
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
2-Methacrylamido-3-arylpropionic acid, where aryl is 1-naphthyl (M1NpPA), 2-naphthyl (M2NpPA), or 1-pyrenyl (M1PyPA), was synthesized. Free radical polymerization gave polymers which were soluble in water at pH 〉 6. In aqueous solution, poly(M1NpPA) and poly(M2NpPA) exhibited strong excimer fluorescence as a dominant component, whereas poly(M1PvPA) showed weak monomer fluorescence as a main component. Excitation spectra and fluorescence quenching by Tl+ ions suggested that naphthyl groups in poly(M1NpPA) and poly(M2NpPA) interacted so as to form excimer sites, by which migrating excited singlets were trapped, leading to the strong excimer emission. It was suggested, however, that pyrenyl groups in poly(M1PyPA) were sterically so constrained that they could not attain the full-overlap excimer conformation but could only interact to form self-quenching sites, to which energy migration occurred, leading to weak fluorescence. © 1993 John Wiley & Sons, Inc.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1993.080310325
Permalink
