Photophysical properties of TICT molecule adsorbed on semiconductor titania–silica colloids |
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| Affiliation: | 1. Institute of Surface Chemistry, 03164 Kiev, Ukraine;2. Institute of Physical Chemistry, 01-224 Warsaw and Institute of Chemistry, Świętokrzyska Academy, 25-020 Kielce, Poland;3. H.Kołłątaj Agricultural University, al. Mickiewicza 24/28, 30-059 Cracow, Poland;1. Institut de Tècniques Energètiques and Centre for Research in NanoEngineering, Universitat Politècnica de Catalunya, Av. Diagonal 647, Ed. ETSEIB, 08028 Barcelona, Spain;2. Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain;1. Graduate School of Science, Kochi University, 2-5-1, Akebono-cho, Kochi-shi, Kochi, 780-8520, Japan;2. Faculty of Science, Kochi University, 2-5-1, Akebono-cho, Kochi-shi, Kochi, 780-8520, Japan;3. Research and Education Faculty, Multidisciplinary Science Cluster, Interdisciplinary Science Unit, Kochi University, 2-5-1, Akebono-cho, Kochi-shi, Kochi 780-8520, Japan;1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650092, PR China |
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| Abstract: | The effect of semiconductor titania–silica colloids on the fluorescent properties of adsorbed 4-(4′-N,N-diethylaminophenyl-3,5-dimethyl-1,7-diphenyl-bis-pyrazolo-[3,4-b, 3′-e]-pyridine (DEA-DMPP) has been studied by steady-state and time-resolved fluorescence spectroscopy. 3,5-dimethyl-1,7-diphenyl-bis-pyrazolo-[3,4-b,3′-e]-pyridine (DMPP) in presence of N,N-dimethylaniline has been employed as the system simulating the separate electron acceptor and electron donor subunits of DEA-DMPP molecule. Silica and titania–silica colloid surfaces inhibited the formation of the intramolecular charge transfer state (ICT) of adsorbed DEA-DMPP due to formation of H-bonds between the amino group of DEA-DMPP and OH-groups localized on the surface. |
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