Abstract
The miscibility of nitromethane with pentanol and isobutanol and the influence of deuterium substitution over a broad concentration range have been reported. The miscibility results enable the construction of the phase diagrams for eight systems. It appears that deuteration both in the OH group of alcohol and/or the methyl group of nitromethane increases the domain of the limited miscibility, and the isotope shift of the upper critical solution temperature ranges from 0.15 K for deuterated alcohols to 1.38 K for deuterated nitromethane + regular isobutanol system. The phase diagrams can be described by using a scaling equation with a critical exponent β close to the predicted one and practically independent of the isotope substitution. The good description of the system was also obtained by using the classical equations based on the mean-field theory.
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