Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 6, Pages 1556-1560Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am100195v
Keywords
layer-by-layer self-assembly; rose bengal; fluorescein; fluorescence; singlet molecular oxygen
Funding
- CONICET [PIP 0319]
- ANPCyT [PICT 00938]
- UBA [UBACyT X202]
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The interaction of rose Bengal (RB) and fluorescein (FL) with poly[diallyldimethylammonium] chloride (PDDA) was studied in layer-by-layer self-assembled thin films and in solution. The spectroscopic behavior is explained in terms of dye dye, dye polyelectrolyte, and in solution, dye solvent interactions. A correlation among dye hydrophobicity, aggregation tendency, polymer folding in solution, and the stability of self-assembled Films is obtained. In spite of the very high dye concentration (similar to 1 M), RB-PDDA multilayer thin films are able to photogenerate singlet molecular oxygen, as demonstrated by chemical monitoring and IR phosphorescence detection.
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