Dielectric Spectroscopy of Some Nitro Phenyl Hydrazones, with Some Data at Elevated Pressures
作者:
W.Garrett Scaife,
Graham McMullin,
Herbert Groothues,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 261,
issue 1
页码: 51-62
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508033451
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Dielectric measurements at ambient and elevated pressure confirm the proposal1, that the two nitrophenylhydrazone compounds studied which display discotic phases, exist as dimers. The dipolar contribution to dielectric permittivity in the solid phase comes mainly from the alkoxy groups, and is augmented in the liquid phases by contributions from the hydrogen bonded o-N02group, The two tailed material with a narrow mesophase exhibits erratic behaviour suggestive of the existence of meta-stable states in the solid phase. The use of a commercial ITO coated cell for the non-discotic compound revealed two separate artefacts which limited the value of the data.
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