Solid compound formation from solutions of N,N-dimethylacetamide with carbon tetrachloride and related substances. A solid phase transition in N,N-dimethylacetamide

Abstract

Solid-liquid phase equilibria studies were used to investigate possible compound formation in solutions of N,N-dimethylacetamide (DMA) with a series of halogenated hydrocarbons that were selected to give a wide range of acceptor properties. Solid 1 : 1 intermolecular compounds were identified from solutions of DMA with CCl₄, CBrCl₃, CFCl₃ and C₆H₅CCl₃. No compounds were formed in solutions of DMA with either CH₃CCl₃ or C₆H₅CF₃. The results suggest charge transfer from DMA to the chlorine atoms of the acceptor molecule as the process for compound formation. A solid phase transition occurring in DMA at 223°K was identified.