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.