Static, Microwave, Infrared, and Visible Permittivity Related to chemicalStructure: N-Methylacetamide, N-dimethyl Acetamide and their Mixtures in CCl4 at 32 C

摘要

Static dielectric permittivities, E sub 0, and visible refractive indices, n subd (at the sodium doublet wavelength = 589.3 nm) are reported for N-methylacetamide (NMA), N-dimethylacetamide (DMA), their mixtures with CCl4 over a broad concentration range and for NMA-DMA mixtures over a broad range of concentrations at 32 deg C. UHF and microwave complex permittivities from 0.3 to 90 Ghz and far infrared refractive indices at frequency = 130 and frequency =380/cm for NMA and their mixtures with CCL4 and at frequency = 130/cm for DMA-CCL4 mixtures up to 1 M DMA at 32 deg C are also reported. Dramatic differences between NMA and DMA in both the static permittivities and relaxation times (for both pure liquids and their mixtures in CCl4) are attributed to chain formation through H-bonding for the monosubstituted amides. DMA acts as a kind of chain-terminator when added to NMA. The difference in behavior between the two liquids disappears in the case of infrared permittivities and visible (n sub d)sq values.