Characterization of multicomponent mixtures containing piperidine, 1-methylpiperidine, 2-pyrrolidinone and isomeric picolines

Abstract The paper reports densities, speeds of sound of binary 2-pyrrolidinone (2) + 2-, 3-, 4- picoline (3) and ternary piperidine, 1-methylpiperidine (1) + 2-pyrrolidinone (2) + 2-, 3-, 4-picoline (3) mixtures over full composition of x1; x1 and x2 within range 293.15–308.15 K with 5 K footstep at atmospheric pressure. The molar heat capacities of the same set of binary mixtures have also been measured at the above said temperatures. Excess molar volumes, VE, V123E; excess isentropic compressibilities, κSE, (κSE)123 and excess heat capacities, CPE for the current mixtures have been determined from the measured data and derived properties have been correlated to composition using Redlich–Kister equation. VE, V123E, κSE, (κSE)123, CPE; IR spectral studies and estimated internuclear distances among interacted atoms (using quantum concepts) have been used to characterize interactions in mixtures taking into consideration effect of composition and temperature.