Intermolecular compound formation in solutions of N,N-dimethylformamide with carbon tetrachloride and several related substances. A solid phase transition in N,N-dimethylformamide

Abstract

Phase equilibria studies were used to investigate possible compound formation in solutions of N,N-dimethylformamide (DMF) with a series of halogenated hydrocarbons that were selected to give a wide range of electron acceptor properties. The following intermolecular compounds were identified: DMF . CCl₄, (DMF)₂ . CCl₄, DMF . CBrCl₃, (DMF)₂ . CBrCl₃, DMF . CFCl₃, and DMF . C₆H₅CCl₃. No compounds were formed in solutions of DMF with either CH₃CCl₃ or C₆H₅CF₃. The results suggest charge transfer from DMF to the chlorine atoms of the acceptor molecule as the process for compound formation. A solid phase transition in DMF, difficult to obtain, was identified.