ISSN:
0887-624X
Schlagwort(e):
antenna effect
;
photocatalytic activity
;
solubilization
;
distribution coefficient
;
poly(sodium styrene sulfonate-co-N-vinylcarbazole)
;
poly[sodium styrene sulfonate-co-N-(acryloyloxyhexyl)carbazole]
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Two new antenna polyelectrolytes, poly(sodium styrenesulfonate-co-N-vinylcarbazole) (PSSS-VCz) and poly[sodium styrenesulfonate-co-N-(acryloyloxyhexyl)carbazole](PSSS-AHCz) have been synthesized. Both polymers were found to solubilize large hydrophobic compounds such as perylene in aqueous solution, but PSSS-AHCz was much more efficient than PSSS-VCz. The distribution coefficients of perylene between the polymer pseudophase and water was determined to be (2.9 ± 0.1) × 106 and (4.0 ± 0.2) × 104 in PSSS-AHCz and PSSS-VCz, respectively. The greater solubilizing ability of PSSS-AHCz is attributed to the higher content of hydrophobic monomer units in the polymer. Both copolymers displayed photocatalytic activity, absorbing light in the UV-visible spectral region. Energy can then be transferred to a solubilized molecule or dissolved oxygen and induce photochemical reactions. The model reaction used in this study was the photosensitized oxidation of perylene solubilized in aqueous polymer solutions. PSSS-AHCz was found to be a much more efficient photocatalyst than PSSS-VCz. The enhanced photocatalytic activity of PSSS-AHCz is attributed to the greater concentration of carbazole chromophores, the higher local concentration of probe in the polymeric pseudophase and possibly to the elimination of the low-energy excimer.
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pola.1992.080300211
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