NMR study of hydrogen molybdenum bronzes: H1.71MoO3 and H0.36MoO3期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

NMR study of hydrogen molybdenum bronzes: H_1.71MoO₃ and H_0.36MoO₃

Authors:	R.C.T. Slade T.K. Halstead P.G. Dickens

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

Abstract:	Proton NMR relaxation times (T₂T₁, and T_1?) and absorption spectra are reported for the compounds H_1.71MoO₃ (red monoclinic) and H_0.36MoO₃ (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 H_1.71MoO₃ and as pairs of OH groups in H_0.36MoO₃. The room temperature lineshape for H_1.71MoO₃ 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 E_A = 22 kJ mole^?1 and $τ^{0}_{C} ? 10^{?13} sec$ for H_1.71MoO₃ and E_A = 11 kJ mole^?1 and $τ^{0}_{C} ? 3 × 10^{?8} sec$ for H_0.36MoO₃.

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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