Photophysics of Supported Dyes: Phthalocyanine on Silanized Silica

ANALIA IRIEL; MARIA GABRIELA LAGORIO; LELIA DICELIO; ENRIQUE SAN ROMÁN

PHYSICAL CHEMISTRY CHEMICAL PHYSICS

ROYAL SOC CHEMISTRY

Año: 2002 vol. 4 p. 224 - 231

1463-9076

Aluminum tetracarboxyphthalocyanine is adsorbed onto silanized silica particles at different dye to particle ratios. Diffuse reflectance spectra are measured and the equilibrium between dye monomers and aggregates is studied. Between 4.0108 and 2.0106 mol of dye g1 of support, a simple dimerization equilibrium explains experimental results. Fluorescence spectra and quantum yields are calculated and corrected for light absorption by non-fluorescent dimers and reabsorption of emitted radiation. Once corrected, fluorescence quantum yields are of the same order of magnitude than in solution. Absorption spectra are also obtained for suspensions of the same materials in water. The hydrophilic environment enhances aggregation dramatically. Singlet oxygen quantum yields measured in suspension are lower than those found for the same phthalocyanine in solution of DMSO. Results are compared with those previously obtained for similar materials.