DYNAMIC AND ELECTROOPTICAL PARAMETERS OF AMINOGROUPS IN FLUORINATED AROMATIC-AMINES WITH INTERMOLECULAR HYDROGEN-BONDING INTO 1/1 COMPLEXES

Infrared spectra of free molecules of 4-methoxytetrofluoroaniline, pentafluoroaniline a:nd 4-aminotetrofluoropyridine and of those ones H-bonded into 1:1 complexes with various proton accepters have been studied in the region of aminogroup stretching vibrations in CCl4 medium. Spectral characteristics of absorption bands of monomers and complexes have been determined. Vibrational and electro-optical problems for free and H-bonded molecules were solved. Valent angles partial derivative(HNH), dynamic constants K(NH) and electro-optical parameters partial derivative mu/partial derivative q (derivatives with respect to bond length) and partial derivative mu/partial derivative q' (derivative with respect to adjacent bond) of free and bonded molecules have been calculated. Correlations between spectral, geometrical, dynamic and electro-optical properties of aminogroups of free molecules and those of bonded ones have been established. The nature of relationship of partial derivative mu(1)/partial derivative q(1)(for active in H-bonding group) and (K-1(NH))(1/2) parameters for weak proton donors is determined predominantly by proton accepters features. For strong donors it depends mainly on proton donors properties. In intermediate cases correlation between electro-optical and dynamic characteristics of bonded NH-groups is controlled by proton donors and accepters alike.