Regular ArticleHmEandVmEof the polar solventsN-methyl-2-pyrrolidinone(C5H9NO), orN,N- dimethylformamide(C3H7NO), or dimethyl sulphoxide(C2H6SO)with 1-hexyne, or 1-heptyne, or 1-octyne atT =  298.15 K, and application of the ERAS theory

Add time:09/25/2019    Source:sciencedirect.com

In this paper we report excess molar enthalpies HmEand excess molar volumes VmEof the polar solvents N -methyl-2-pyrrolidinone (C5H9NO), N, N - dimethylformamide (C3H7NO), and dimethyl sulphoxide (C2H6SO) with 1-hexyne, or 1-heptyne, or 1-octyne at T =  298.15 K. The HmEvalues are negative for the mixtures of N -methyl-2-pyrrolidinone, or N, N - dimethyl formamide with a 1-alkyne and become more positive with increasing 1-alkyne chain length. The HmEvalues are positive for dimethyl sulphoxide with a 1-alkyne and increase with increasing chain length. The VmEresults are negative for all the systems studied here. The ERAS model (extended real associated solution) has been applied to these mixtures, and the results are discussed in terms of intermolecular associations.

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