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- W2083801344 abstract "Abstract A new A3B porphyrin structure, namely: 5-(4-phenoxyphenyl)-10,15,20-tris(4-pyridyl)-porphyrin was synthetized and characterized by FT-IR, UV–vis, Fluorescence, MS, 1H NMR, TLC and HPLC. Novel hybrid-silica porphyrin nanomaterials were obtained by immobilizing the porphyrin in silica supports synthesized from tetraethoxysilane, tetramethoxysilane or mixtures of tetraethoxysilane/methyltriethoxysilane. Since the behavior and performance of immobilized porphyrin molecules in the silica matrices strongly depend on the structure of the porous network, a comparative characterization of the silica support and the hybrid porphyrin-silica materials was carried out using specific physicochemical characterization methods: UV–vis, Fluorencence, FT-IR spectroscopy, thermal analysis, AFM, nitrogen adsorption and small-angle neutron scattering. The UV–vis spectra show that no protonation and aggregation of porphyrin takes place in the gels made from methyltriethoxysilane precursor. Most of the emission spectra preserve both the shape and the intensity of the corresponding free porphyrin. Due to the lack of aggregation, when using the methyltriethoxysilane precursor, the quenching of fluorescence is also diminished. No matter of the preparation method the specific surface areas increase in the following order: TEOS" @default.
- W2083801344 created "2016-06-24" @default.
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- W2083801344 date "2014-11-01" @default.
- W2083801344 modified "2023-10-18" @default.
- W2083801344 title "Hybrid organic – silica nanomaterials based on novel A3B mixed substituted porphyrin" @default.
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- W2083801344 doi "https://doi.org/10.1016/j.matchemphys.2014.07.023" @default.
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