INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Dye-polyelectrolyte layer-by-layer self-assembled materials: molecular aggregation, structural stability and singlet oxygen photogeneration
MARTÍN MIRENDA; CRISTIAN A. STRASSERT; LELIA E. DICELIO; ENRIQUE SAN ROMÁN
ACS APPLIED MATERIALS & INTERFACES
AMER CHEMICAL SOC
Año: 2010 vol. 2 p. 1556 - 1556
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 ehavior is explained in terms of dye-dye, dye-polyelectrolyte, and in solution, dye-solvent interactions. A correlation among dye ydrophobicity, aggregation tendency, polymer folding in solution, and the stability of self-assembled films is obtained. In spite of the very high dye concentration (∼1 M), RB-PDDA multilayer thin films are able to photogenerate singlet molecular oxygen, as demonstrated by chemical monitoring and IR phosphorescence detection.