An extended proton magnetic resonance study of lithium sulfate monohydrate is presented. An oddity in the resulting Pake curves appears. Some of the curves show a shift so that they are described by equations of the form, ΔH=2α[3 cos2(φ+φ0) cos2δ−1] +constant shift. There are two orientations of the hydrated water molecule. For these the direction angles of the proton-proton axes with respect to the crystallographic a, b, and c axes are, respectively, α0=97°, β0=45°, γ0=48°, and α0=74°, β0=38°, γ0=127°. Apparently the hydrogens bond O5— —H–O5–H— —O1, where O5 are neighboring water oxygens and O1 is a sulfate oxygen. Several possible origins of the shifts in the Pake curves are discussed with limited success. An adequate theoretical explanation is lacking.
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McGrath et al. (1959) studied this question.
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