Thermoacoustic and DFT Analysis of N , N -Dimethylacetamide (DMA) with 1-Propanol and Methanol at 293.15, 303.15, and 313.15 K

In the present communication, we report molecular interaction studies in binary systems of N,N-dimethylacetamide (DMA) with 1-propanol and methanol. The density (ρm) and ultrasonic velocity (um) have been measured experimentally for binary solutions of DMA with 1-propanol and methanol at varying concentrations and temperatures. The intermolecular interactions present in the mixtures have been investigated through deviation in ultrasonic velocity (Δu), excess acoustic impedance (ZE), and excess intermolecular free length (LfE). Various semi-empirical mixing rules and theories were proposed by Nomoto, Vandeal, Junjie, collision factor theory (CFT), and Flory’s statistical theory (FST) to estimate the ultrasonic velocity of liquid mixtures. Hankinson-Brobst-Thomson (HBT) and Rackett density models have been used to compare the experimental and theoretically calculated density values. The experimental data are in good agreement with the calculated data as obtained by the DFT (B3LYP and CAM-B3LYP) method.