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1959•The Journal of Chemical PhysicsRequires access

Proton Magnetic Resonance Study of Lithium Sulfate Monohydrate

James W. McGrath, Anthony A. Silvidi, Jeffrey Carroll

Open publisher page 22 citations

Abstract

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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What this paper is about

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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Available abstract

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.

Key concepts: Proton, Proton magnetic resonance, Sulfate, Lithium (medication), Chemistry, Molecule, Resonance (particle physics), Lithium sulfate

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