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• W2313446378 endingPage "963" @default.
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• W2313446378 abstract "Two hybrid materials based on dodecatungstophosphoric acid (HPW) dispersed in ormosils modified with 3-aminopropiltrietoxysilane (APTS) or with N-(3-(trimethoxysilyl)-propyl)-ethylenediamine (TSPEN) show reversible photochromic response induced by irradiation in the 200−390 nm UV range. A set of solid-state nuclear magnetic resonance (NMR) techniques was used to analyze the structural properties of the main components of these hybrids (the HPW polyanion, the inorganic matrix, and the organic functionalities). For the ormosils, the use of 29Si NMR, {1H}-29Si cross-polarization, and {1H}-29Si HETCOR revealed a homogeneous distribution of silicon species Qn, T2, and T3 for the APTS hybrid, contrasting with the separation of T3 species in the TSPEN hybrid. The combination of 31P NMR, {1H}-31P cross-polarization and 31P-{1H} spin−echo double resonance (SEDOR) revealed the dispersion of the HPW ions in the ormosil, occupying sites with a high number of close protons (>50). Differences in the molecular dynamics at room temperature, inferred from SEDOR experiments, indicate a state of restricted mobility of the HPW ion and the surrounding molecular groups in the TSPEN hybrid. This behavior is consistent with the presence of more amino groups in the TSPEN, acting as chelating groups to the HPW ion. This hybrid, with the strong chelate interaction of the diamine group, shows the most intense photochromic response, in agreement with the charge transfer models proposed to explain the photochromic effect. Electronic reflectance spectroscopy in irradiated samples revealed the presence of one-electron and two-electron reduced polyanions. The one-electron reduced species could be detected also by 31P NMR spectroscopy immediately after UV irradiation." @default.
• W2313446378 created "2016-06-24" @default.
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• W2313446378 date "2011-01-19" @default.
• W2313446378 modified "2023-10-18" @default.
• W2313446378 title "Local Structure and Photochromic Response in Ormosils Containing Dodecatungstophosphoric Acid" @default.
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• W2313446378 doi "https://doi.org/10.1021/cm1022272" @default.
• W2313446378 hasPublicationYear "2011" @default.
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