Thermodynamics and spectroscopic properties of N-methylpiperazine with propan-1-ol, 2-propen-1-ol, 2-propyn-1-ol

The density (ρ), viscosity (η), and speed of sound (u) are reported for binary mixtures of N-methylpiperazine with aliphatic primary alcohols (propan-1-ol, 2-propen-1-ol, 2-propyn-1-ol) over the entire composition range from 303.15 K to 313.15 K and at atmospheric pressure 0.1 MPa. The excess parameters (VE,κsE), deviation in viscosity, and excess partial properties
(V�Em;1,V�Em;2K�Es;m;1K�Es;m;2 and K�Es;m;2) of the components at infinite dilution were calculated from the density, speed of sound, and viscosity at experimental
temperatures. All the investigated systems exhibit positive values of Δη and ΔG*E and negative values of VE and κsE over the whole composition
range. The obvious deviations attribute to the association between the primary alcohols and N-methyl piperazine molecules through the hydrogen bond of O-H· · ·N. A good agreement is obtained between excess quantities and FTIR spectroscopic data.