Infrared optical constants, molar absorption coefficients, dielectric constants, molar polarisabilities, transition moments and dipole moment derivatives of liquid N,N-dimethylacetamide–carbon tetrachloride mixtures

Infrared optical constants, molar absorption coefficients, dielectric constants, molar polarisabilities, transition moments and dipole moment derivatives of liquid N,N-dimethylformamide–carbon tetrachloride mixtures

“…Other similarities between liquid DMF and DMA were considered previously [1]. Here is only to be emphasised significant difference in viscosity of the two liquids: Á = 0.794 mPa s for DMF and 1.972 mPa s for DMA, respectively, which obviously reflect substantial difference between liquid DMF and DMA.…”

“…Thus, as in the case of DMA-carbon tetrachloride system [1], to obtain useful spectroscopic information, spectra are divided into 5 regions of similar absorption. In Table 1, these regions are listed.…”

“…PKREF programme (KRK mode) was used to calculate optical constant spectra from pATR(˜ ) spectra [27]. From optical constants, using the procedure described previously [1,28], molar absorption coefficient E m (˜ ), and complex dielectric constantε(˜ )…”

“…At this stage it is interesting to warn that the amide I band of DMF is evidently asymmetric, with a somewhat broader wing at the low-wavenumber side. Similarly, amide I band of DMA is also asymmetric, but with a broader wing at high-wavenumber side [1]. Comparison of the amide I bandshapes for DMF and DMA, respectively, by fitting the absorption to Voigt profile function shows that in the case of DMF, band is somewhat more Lorentzian-like than in the case of DMA.…”

“…This structural feature is expected to prevent them from hydrogen bonding strong enough to build aggregates which are stable in the liquid state. In the first paper of this series, optical constants and derived quantities of DMA-carbon tetrachloride system were discussed [1]. Here we present the same for DMF-carbon tetrachloride mixtures.…”