Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica
The effect of titania-silica binaries on the processes of PET and the decay kinetics of the Anthracene (An) fluorescence and An radical cation in presence of the co-adsorbed electron donor N,Ndimethylaniline (DMA) has been studied. The fluorescence of excited An adsorbed on pure silica is quenched b...
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| Format: | Article |
| Language: | English |
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Wiley
2004-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X04000029 |
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| author | Anna Eremenko Natalie Smirnova Oksana Yakimenko Galina Starukh David R. Worrall Siân L. Williams |
| author_facet | Anna Eremenko Natalie Smirnova Oksana Yakimenko Galina Starukh David R. Worrall Siân L. Williams |
| author_sort | Anna Eremenko |
| collection | DOAJ |
| description | The effect of titania-silica binaries on the processes of PET and the decay kinetics of the
Anthracene (An) fluorescence and An radical cation in presence of the co-adsorbed electron donor N,Ndimethylaniline
(DMA) has been studied. The fluorescence of excited An adsorbed on pure silica is quenched
by the addition of DMA, while co-adsorption of DMA on Ti/Si binaries resulted in increase of fluorescence
intensity of adsorbed An. We suggest that competitive adsorption between DMA and An results in DMA
occupying more active “titania” sites causing the shift of An molecules to weaker adsorption sites located
on the silica support. An and DMA molecules being adsorbed simultaneously on the surface, effectively produce
reduced titanium ions due to an electron transfer process. These data appear to lend weight to the
suggestion of a pre-exciplex An-DMA state on the surface and effective PET from the excited molecular pair
to the acceptor sites on the surface. These sites may be titania aggregates, or titania ions when there is a low
content of Ti in the binaries. |
| format | Article |
| id | doaj-art-04776407d5774a72a34ce31d45f9a196 |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2004-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-04776407d5774a72a34ce31d45f9a1962025-08-20T03:54:15ZengWileyInternational Journal of Photoenergy1110-662X2004-01-0161111610.1155/S1110662X04000029Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silicaAnna Eremenko0Natalie Smirnova1Oksana Yakimenko2Galina Starukh3David R. Worrall4Siân L. Williams5Institute of Surface Chemistry of National Ukrainian Academy of Sciences, Kiev 03164, UkraineInstitute of Surface Chemistry of National Ukrainian Academy of Sciences, Kiev 03164, UkraineInstitute of Surface Chemistry of National Ukrainian Academy of Sciences, Kiev 03164, UkraineInstitute of Surface Chemistry of National Ukrainian Academy of Sciences, Kiev 03164, UkraineDepartment of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UKDepartment of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UKThe effect of titania-silica binaries on the processes of PET and the decay kinetics of the Anthracene (An) fluorescence and An radical cation in presence of the co-adsorbed electron donor N,Ndimethylaniline (DMA) has been studied. The fluorescence of excited An adsorbed on pure silica is quenched by the addition of DMA, while co-adsorption of DMA on Ti/Si binaries resulted in increase of fluorescence intensity of adsorbed An. We suggest that competitive adsorption between DMA and An results in DMA occupying more active “titania” sites causing the shift of An molecules to weaker adsorption sites located on the silica support. An and DMA molecules being adsorbed simultaneously on the surface, effectively produce reduced titanium ions due to an electron transfer process. These data appear to lend weight to the suggestion of a pre-exciplex An-DMA state on the surface and effective PET from the excited molecular pair to the acceptor sites on the surface. These sites may be titania aggregates, or titania ions when there is a low content of Ti in the binaries.http://dx.doi.org/10.1155/S1110662X04000029 |
| spellingShingle | Anna Eremenko Natalie Smirnova Oksana Yakimenko Galina Starukh David R. Worrall Siân L. Williams Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica International Journal of Photoenergy |
| title | Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica |
| title_full | Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica |
| title_fullStr | Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica |
| title_full_unstemmed | Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica |
| title_short | Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica |
| title_sort | electron transfer processes of coadsorbed anthracene and n n dimethylaniline on titania silica |
| url | http://dx.doi.org/10.1155/S1110662X04000029 |
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