The infra-red intensities of the carbonyl band in halogenated derivatives of acetic acid

Organobismuth compounds. I. Studies on triphenylbismuth(V) derivatives, Ph3BiX2

“…The assignments have been made by comparison with those for the acids (12,13), so,dium carboxylates (14), trimethyltin haloacetates (15,16), trimethyl-and triphenyl-antimony haloacetates (17), and phenylmercuric carboxylates (18). The assignments for the monofluoroacetate require further comment.…”

Integrated Intensities of Absorption Bands in Infrared Spectroscopy

“…A correlation between the C=O bond intensity and the Taft a* constant has been observed [146] in halogenated acetic acids. The intensities and a* values ranged from 1.95 units (o* 0.0)inacetic acid to 1.47 units (CT* 2.6) in trifluoroacetic acid.…”

“…The C=O integrated intensities of the dimer and monomer species may not be very different [146], nor may the intensities of the various solvent-complex forms vary much from the values for dimer [147]. Some characteristic data are presented in Table 22.…”

“…Conformational isomerism has been suggested in the cases of ortho'-halogenated acids and their esters [148]. One clue to possible presence of rotational and conformational isomers is in broadening of the band, which is observed in monochloroacetic [146] and isobutyric acid [147]. Extreme broadening of the band is observed in o-chlorobenzoic acid (dimer) with a band half-width of 45 cm" 1 compared with a group average of about 16 cm" 1 in meta-and para-substituted benzoic acids.…”