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| - Binary Diol−Water Systems Studied by 17O Nuclear Magnetic Resonance Spectroscopy.Interpretation of the Effect of Diol Structure on 17O-Water Chemical Shift. Formation ofNetworks of Water Molecules Stabilized by Weak C−H···O Interactions
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| - The chemical shift for 17O-labeled water in binary diol−water systems shows two types of dependency onmole fraction, determined by the structure of the diol. Type I behavior consists of a single component whichis substantially linear and monotonic in the upfield direction with increasing diol concentration and independentof temperature. Type II behavior is biphasic with an initial downfield component which is strongly temperaturedependent occurring for glycol mole fractions <0.20, followed at mole fractions ≥0.20 by a linear componentwhich may be in either the upfield or downfield direction, analogous to type I behavior. Type II behaviorseems to be associated exclusively with diols containing a terminal methylcarbinol group, CH3CH(OH)−, atleast for the series of diols studied in this paper. The initial downfield component caused by this group isinterpreted in terms of water structuring and the formation of a clathrate-like cage involving 10−15 watermonomers stabilized by weak hydrogen bonds around the methylcarbinol group.
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