Popis: |
Influence of the aromatic fluorine atoms in compounds of the type ArYAr ( Y = -NN-, -NN(O)-,-CN- ) and ArNSO on frequencies and intensities of stretching vibrations of functional groups in Raman spectra has been studied. The stretching frequencies of groups -NN-, -NN(O)-, -CHN-, -NSO are shown to be practically independent of position and number of fluorine atoms, but the intensities do depend. This is attributed to the changed effectivity of conjugation of nitrogen non-bonding electron pair with the aromatic π -system caused by the influence of fluorine atoms. |