1H nuclear magnetic resonance study of solute–solvent interactions of 1-methyl-2-pyrrolidone and some substituted benzenes

Abstract

Solute–solvent interactions in binary mixtures of 1-methyl-2-pyrrolidone (NMP) with some substituted benzenes have been monitored using ¹H n.m.r. spectroscopy. Changes in the chemical shift (Δδ) of alkyl protons adjacent to the amide group have been determined and NMP found to be an electron-accepting molecule. The electron-donating ability of the aromatic ring varies with ring substitution. Satisfactory correlations are found between Δδ_CH2N and Δδ_ArH and excess volume of mixing.