Abstract
The thermodynamic parameters viz . excess molar volume V E and speed of sound u, transport parameter viscosity η, and spectroscopic parameters viz. IR, 1H, 13C NMR have been measured for the mixtures of isomeric butanediol (1,2-, 1,3-, 1,4-, and 2,3-butanediol) and N-methyl-2-pyrrolidinone over the whole composition range at 308.15 K. The partial molar quantities Q i E , isentropic compressibility K S E , viscosity deviation Δ η, deviation in Gibbs free energies of activation for viscous flow g( x), and excess NMR chemical shift δ E have been estimated and analyzed. Results show that the interaction between unlike molecules takes place through hydroxyl groups of isomeric butanediol and CO group of N-methyl-2-pyrrolidinone. Excellent agreement between thermodynamic and spectroscopic measurements is observed.
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