Proton shift tensors in hydrogen molybdenum bronze

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Abstract
Proton N.M.R. powder pattern lineshapes for a series of hydrogen molybdenum bronzes prepared using a wet chemistry method are presented and compared with published results for bronzes prepared using the hydrogen spillover method. The results demonstrate that a bronze is formed which exhibits the same unusual proton N.M.R. spectra as found for H1.6MoO3 prepared by the hydrogen spillover method. Single crystals prepared by the wet chemistry method exhibit an obvious visual anisotropy. A single crystal 1H N.M.R. rotation study of H1.6MoO3 is reported. Although the detailed structure of the bronze is not known, the principal axis frame of the tensor can be related simply to the crystal frame of the bronze at room temperature. Unusual temperature dependence of the tensor components is reported and discussed in terms of electronic properties of the solid

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