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Dielectric spectra of some common solvents in the microwave region. Dipolar aprotic solvents and amides

Barthel, Josef ; Bachhuber, K. ; Buchner, Richard ; Gill, J. B. ; Kleebauer, M.


Precise complex permittivity spectra of the amides formamide, N-methylformamide (NMF), N,N-dimethylformamide, and N,N-dimethylacetamide and of the dipolar aprotic solvents acetonitrile, propylene carbonate, and DMSO were detd. at 0.95-89 GHz. The dielec. relaxation of all liqs. is nonexponential, ranging from a small sym. relaxation time distribution for acetonitrile to 3 discrete dispersion steps for NMF.

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