THE NEAR-INFRARED SPECTROSCOPIC STUDIES OF THE HYDROGEN-BONDING BETWEEN THIOACETAMIDE AND AZINES IN NONAQUEOUS SOLUTIONS

The nature of hydrogen bonding between thioacetamide and azines has be en thoroughly investigated using near IR absorption spectroscopy. The v(N.H) + amide II combination band in thioacetamide (TA) has been anal yzed to determine the thermodynamic constants for the formation of hyd rogen bonded 1:1 TA:azine complexes in CCl4 and CHCl3 solutions. The r elative stabilities of TA-azine complexes (pyridine-> 1,3-diazine-> 1, 3-diazine-> 1.4-diazine-TA) are in good agreement with the relative pr oton affinities of azines in the gas phase. The results serve as a bas is for analyzing the factors which influence the hydrogen bonding form ation of TA in nonaqueous solutions.