NMR study of proton transport in the inorganic ion-exchange compounds SnO2·nH2O and TiO2·nH2O |
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| Authors: | RCT Slade MG Gross WA England |
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| Institution: | Department of Chemistry, University of Exeter, Exeter EX4 4QD, UK;Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, UK |
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| Abstract: | Proton NMR relaxation times (T2, T1, T1? and T1D) are reported for hydrous tin oxide (SnO2·nH2O) and hydrous titania (TiO2·nH2O) in the temperature range 135 K<T<336 K at 60 and 20 MHz. The data show proton transport including exchange between three environments: (1) surface hydroxyl groups, (2) “acid solution” in micropores (diameter <100 Å) and (3) “acid solution” in macropores (diameter>1000 Å). The NMR behaviour has many features in common with that of adsorbed water systems. A consistent interpretation of both NMR and conductivity data is presented. |
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