Hydrogen Bonding between Thioacetamide and Some N,N-dimethylalkylamides in Chloroform

摘要

The near-IR spectra of thioacetamide were recorded for the investigation of hydrogen bonding between thioacetamide (TA) and N,N-dimethylalkylamides (DMF, DMA, DMP) in chloroform over the range of 5∩ to 55∩. The ロa + amide ケ combination band has been resolved into contributions from monomeric TA, 1:1 hydrogen bonded complex and 1:2 complex by the parameterized matrix modeling method. The association constants (Kc) of the complex have been obtained at various temperatures and used to determine the thermodynamic parameters for the hydrogen bonding by the usual Van`t Hoff method. It was found that N,N-dimethylalkylamide forms less stable hydrogen bonded complex with TA in chloroform than in carbon tetrachloride.