INFRARED-SPECTRA, DYNAMIC AND ELECTROOPTICAL PARAMETERS OF AMINOGROUP OF SUBSTITUTED ANILINES IN H-BONDED 1/1 COMPLEXES

Infrared spectra of free molecules of 4-nitroaniline, 2-chloro- and 2,6-dichloro-4-nitroanilines and their H-bonded complexes (1:1) with acetonitrile, dimethylformamide, dimethylsulphoxide and hexamethylphosphortriamide have been investigated in spectral region of aminogroup stretching vibrations in CCl4 medium. Spectral characteristics of absorbtion bands of monomers and spectral moments of absorbtion bands of H-bonded complexes have been determined. Vibrational and electrooptical problems for free and bonded molecules were solved within the framework of R-NH2 model having regard to dynamic and electrooptical nonequivalency of aminogroup NH-bonds. Valent angles gamma(HNH), force constants of bonds K(NH), electrooptical parameters of aminogroup partial derivative mu/partial derivative q and partial derivative mu/partial derivative q' and constants of equilibrium monomer-complex have been calculated. The influence of substituents in aniline aromatic ring and proton accepting molecules on static and dynamic polarization of aminogroup has been considered. The correlation between spectral, geometrical, dynamic and electrooptical characteristics of studied nitroanilines aminogroups have been derived.