NMR study of hydrogen molybdenum bronzes: H1.71MoO3 and H0.36MoO3 |
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Authors: | R.C.T. Slade T.K. Halstead P.G. Dickens |
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Affiliation: | Department of Chemistry, University of York, Heslington, York YO1 5DD, England;Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, England |
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Abstract: | Proton NMR relaxation times (T2T1, and T1?) and absorption spectra are reported for the compounds H1.71MoO3 (red monoclinic) and H0.36MoO3 (blue orthorhombic) in the temperature range 77 K < T < 450 K. Rigid lattice dipolar spectra show that both compounds contain proton pairs, as OH2 groups coordinated to Mo atoms in H1.71MoO3 and as pairs of OH groups in H0.36MoO3. The room temperature lineshape for H1.71MoO3 shows that the average chemical shielding tensor has a total anisotropy of 20.1 ppm. The relaxation measurements confirm that hydrogen diffusion occurs and give EA = 22 kJ mole?1 and for H1.71MoO3 and EA = 11 kJ mole?1 and for H0.36MoO3. |
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Keywords: | To whom correspondence should be sent. Current address: Inorganic Chemistry Laboratory University of Oxford South Parks Road Oxford OX1 3QR England. |
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