The influence of temperature, within the range 285-340 K, on spectral characteristics of n(NH) absorption bands in 'free' Nmethyl aniline, N-ethyl aniline, diphenylamine and N-methyl-4-nitroaniline in CCl as well as in their hydrogen bonded complexes 4 with acetonitrile, tetrahydrofurane, dimethylformamide (DMF), dimethylsulfoxide (DMSO) and hexamethylphosphoramide (HMPA) was studied. Spectral moments of n(NH) absorption bands were determined: M -the zero spectral moment (integrated 0 ( ) intensity), M -the first spectral moment (the centre of band gravity), M -the second central moment as well as 'effective' 1 2 ( ) ( ) half width of absorption band (Dn ) s2(M ) . The coefficients of the linear correlation of these parameters with a 2 1y2 ( ) 1y2 eff temperature variation YsaTqb (YsM , M , 2(M ) ) were calculated for 'free' and hydrogen-bonded molecules. It was 0 1 2 1 y2 ( ) ( ) ( ) demonstrated that these spectral characteristics considerably depend on the character of the N-substitute. The difference in the position of absorption bands n (NH) in the spectra for non-bonded molecules of N-substituted anilines in CCl is caused by sm 4
M , on the one hand, and yDH values and the increment of the square root of integrated intensity DB sB yB , on the
other hand, were found on passing from free to bonded molecules. However, the proportionality factor a in the equation yDHs aDB depends on individual characteristics of proton donors and remains the same for each proton donor in the row of proton 1y2 acceptors.