VOLUMETRIC BEHAVIOR OF N-METHYLFORMAMIDE-(C-1-C-10)ALKAN-1-OL AND N,N-DIMETHYLFORMAMIDE-(C-1-C-10)ALKAN-1-OL SOLVENT SYSTEMS

Densities were measured for the N-methylformamlde-(C-1-C-10)alkan-1-ol and N,N-dlmethylformamlde-(C-1-C-10)alkan-1-ol solvent mixtures at 29 8-15 K over the whole miscibility range (0<X-1<1), The excess volumes (V-E), which Pre discussed in terms of intermolecular interactions, ar e negative for the mixtures with the smallest alkanols in the series a nd increase with increase in the chain length. Comparison with other a mide-alcohol mixtures previously investigated (formamide and pyrrolidi n-2-one) indicates that the excess volumes are strongly influenced by the size of the alcohol and to a lesser extent by the nature of the am ide, In contrast with the amide-water system, neither the amide size n or Its degree of sustitution plays an Important role in the amide-alco hol systems investigated. (C) 1997 by John Wiley & Sons, Ltd.