A Proton Spin‐Lattice Relaxation Study of the Water‐Dioxane System

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Abstract
A proton spin‐lattice relaxation study of the water‐dioxane system has been carried out. It was found that contrary to earlier literature reports the intramolecular proton spin‐lattice relaxation rate of the dioxane molecule in dilute aqueous solutions is strongly concentration dependent and in general shows a similar behaviour as the solution viscosity, density, free energy of mixing, and other physical properties. The motions of the dioxane and water molecules in solution appear to become correlated at ∼0.143 mol fraction dioxane; i.e. at a mol ratio of dioxane/water = 1/6. It is suggested that a weak complex, C4H8O2·6H2O, is formed in solution.