Photophysics of supported dyes: Phthalocyanine on silanized silica
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 4.0 × 10-8 and 2.0 × 10-6 mol of dye g-1 of support, a simple dime...
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2002
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v4_n2_p224_Iriel http://hdl.handle.net/20.500.12110/paper_14639076_v4_n2_p224_Iriel |
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paper:paper_14639076_v4_n2_p224_Iriel2023-06-08T16:16:36Z Photophysics of supported dyes: Phthalocyanine on silanized silica aluminum derivative dimethyl sulfoxide dye monomer phthalocyanine silane derivative silicon dioxide singlet oxygen water adsorption aqueous solution article calculation diffuse reflectance spectroscopy dimerization hydrophilicity measurement physical chemistry quantum chemistry radiation spectrofluorometry suspension 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 4.0 × 10-8 and 2.0 × 10-6 mol of dye g-1 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. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v4_n2_p224_Iriel http://hdl.handle.net/20.500.12110/paper_14639076_v4_n2_p224_Iriel |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
aluminum derivative dimethyl sulfoxide dye monomer phthalocyanine silane derivative silicon dioxide singlet oxygen water adsorption aqueous solution article calculation diffuse reflectance spectroscopy dimerization hydrophilicity measurement physical chemistry quantum chemistry radiation spectrofluorometry suspension |
| spellingShingle |
aluminum derivative dimethyl sulfoxide dye monomer phthalocyanine silane derivative silicon dioxide singlet oxygen water adsorption aqueous solution article calculation diffuse reflectance spectroscopy dimerization hydrophilicity measurement physical chemistry quantum chemistry radiation spectrofluorometry suspension Photophysics of supported dyes: Phthalocyanine on silanized silica |
| topic_facet |
aluminum derivative dimethyl sulfoxide dye monomer phthalocyanine silane derivative silicon dioxide singlet oxygen water adsorption aqueous solution article calculation diffuse reflectance spectroscopy dimerization hydrophilicity measurement physical chemistry quantum chemistry radiation spectrofluorometry suspension |
| description |
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 4.0 × 10-8 and 2.0 × 10-6 mol of dye g-1 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. |
| title |
Photophysics of supported dyes: Phthalocyanine on silanized silica |
| title_short |
Photophysics of supported dyes: Phthalocyanine on silanized silica |
| title_full |
Photophysics of supported dyes: Phthalocyanine on silanized silica |
| title_fullStr |
Photophysics of supported dyes: Phthalocyanine on silanized silica |
| title_full_unstemmed |
Photophysics of supported dyes: Phthalocyanine on silanized silica |
| title_sort |
photophysics of supported dyes: phthalocyanine on silanized silica |
| publishDate |
2002 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v4_n2_p224_Iriel http://hdl.handle.net/20.500.12110/paper_14639076_v4_n2_p224_Iriel |
| _version_ |
1768543149624393728 |