The optical properties of the dye DODCI (3,3′-diethyloxadicarbocyanine iodide) incorporated in sol-gel silica-glass matrices have been investigated with regard to interaction with the surrounding silica cage. The absorption and emission spectra have been measured in silica-glass samples with different pore sizes and compared with the spectra obtained in liquid solutions that simulate different environments for the dye molecule. Measurements of a DODCI-derivative molecular structure have been performed by NMR spectroscopy in dimethyl sulfoxide. The results suggest that new electronic states are produced in the trapped molecule, for glass-pore sizes in the range of 2.5-3.5 nm, as a result of the attack of Si-O- groups on the conjugate chain and the protonation to the dicationic form.
Casalboni, M., DE MATTEIS, F., Ferone, V., Prosposito, P., Senesi, R., Pizzoferrato, R., et al. (1998). DODCI molecules incorporated in sol-gel glasses: The interaction with the silica matrix. CHEMICAL PHYSICS LETTERS, 291(1-2), 167-172 [10.1016/S0009-2614(98)00548-X].
DODCI molecules incorporated in sol-gel glasses: The interaction with the silica matrix
CASALBONI, MAURO;DE MATTEIS, FABIO;PROSPOSITO, PAOLO;SENESI, ROBERTO;PIZZOFERRATO, ROBERTO;BIANCO, ALESSANDRA;
1998-01-01
Abstract
The optical properties of the dye DODCI (3,3′-diethyloxadicarbocyanine iodide) incorporated in sol-gel silica-glass matrices have been investigated with regard to interaction with the surrounding silica cage. The absorption and emission spectra have been measured in silica-glass samples with different pore sizes and compared with the spectra obtained in liquid solutions that simulate different environments for the dye molecule. Measurements of a DODCI-derivative molecular structure have been performed by NMR spectroscopy in dimethyl sulfoxide. The results suggest that new electronic states are produced in the trapped molecule, for glass-pore sizes in the range of 2.5-3.5 nm, as a result of the attack of Si-O- groups on the conjugate chain and the protonation to the dicationic form.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
