A Nuclear Magnetic Resonance Study of Water + Acetonitrile Mixtures

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Abstract
Water proton chemical shifts at 308 K and CN-group 13C chemical shifts at 300 K, relative to methyl protons and methyl carbon respectively, have been determined as a function of composition for the water + acetonitrile system. The composition variation of the water proton shift, particularly, suggests that in this system there may be as many as five structurally distinct composition regions, whose possible structures are discussed. This system appears to be more similar to systems like water + dioxan than to most other water + organic solvent systems, except for the complexity of the structural discontinuities in the water + acetonitrile system.

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