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Dielectric relaxation of the diaryl ketones

✍ Scribed by E. Jakusek; H. Kołodziej; S. Sorriso

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
316 KB
Volume
153
Category
Article
ISSN
0009-2614

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✦ Synopsis

The dielectric relaxation of the three symmetrically substituted diary1 ketones: 2,2'-dipyridyl ketone (2,2'-DPyCO), dimes&y1 ketone (DMCO) and 3,3'-dinitromesityl ketone (3,3'-DNDMCO) in pxylene was examined over the frequency range 2-30 GHz, at 293-323 K. A distribution of relaxation times was observed for 2,2'-DPyCO and the average value for TV was found to be lower than for fluorenone. The absorption in the case of DMCO and 3,3'-DNDMCO is monodisperse. A comparison of the relaxation times of these molecules suggests the possibility of a contribution from the intramolecular rotation of the pyridyl rings in 2,2'-DPyCO. The relaxation mechanism of 2,2'-DPyCO is discussed in terms of the Fong and Goulon-Rivail theories.

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