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Hydrogen Bonding of Anilines: Experimental and Theoretical Studies of Complexes of Various Compositions

Borisenko V. E.

Polish Journal of Chemistry

2009

Vol. 83, nr 5

1025-1059

Review of works on studies of the influence of the position, numberand a kind of substituents in phenylring of aniline on proton do or ability in hydrogen bond, spectral, geometric, electrooptic and force characteristics of amino group in complexes with different proton acceptors of 1:1 and 1:2 composition in intra- and intermolecular hydrogen bonds is presented. The influence of proton donors and proton acceptors on the kind of correlation between spectral, geometric, force and electrooptic characteristics of the amino group is analyzed. Obtained results demonstrate the possibility of quantitative description of the changes of dynamic, geometric, force and electrooptic properties of amino group in substituted anilines on passing from free molecules to bonded ones and extend the under standing of the role of various factors in the process of molecular agreegation.

Spectroscopic Studies and VFF Model calculations on Dynamic and Electrooptic Characteristics of N-H Bonds in Amides

Borisenko V., Morev A. V., Bidulya Y. V., Koll A.

Polish Journal of Chemistry

2002

Vol. 76 / nr 10

1481-1494

IR spectroscopic studies of propionamide, n-butyramide, benzamide and 2-(F, Cl, Br)- benzamides within the _(NH) and (HNH) absorption range of -NH2 group for the "free" (in CCl4 solutions) molecules and forming complexes with proton acceptor solvents (benzene, toluene, acetonitrile, dimethylformamide, dimethylsulphoxide and hexamethylphosphoramide) have been performed. Modifying the strength of the intermolecular interactions one can achieve the canceling of the primary non-equivalency of the N-H bonds in the -NH2 group of amides. It allows establishing, for the first time, quantitative measures of dynamic (K(NH)) and electrooptic (_/q) characteristics of N-H bonds in amides in framework of the R-NH2 valence force field model. Dynamic and electrooptic non-equivalencies enhance with the increase of the hydrogen bonding strength. For the hydrogen-bonded complexes with acetonitrile, dimethylformamide, dimethylsulfoxide and hexamethylphosphoramide, the dynamic non-equivalency of NH bonds is increased 10-20%, while the electrooptic parameters _1/q1 and _2/q2 grow two or even three times. The electrooptic coupling of the N-H bonds (the parameter _i/qj, where i, j = 1, 2; i _ j) increases with the strength of the hydrogen bonding.