Laser Raman Study of Terepthalylidene-bis-p-n-Decylaniline (TBDA)
作者:
S.K. Dash,
RanjanK. Singh,
P.R. Alapati,
A.L. Verma,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 319,
issue 1
页码: 147-158
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808045655
出版商: Taylor & Francis Group
关键词: Liquid crystals;Laser Raman spectroscopy;molecular dynamics;SI-Sc transition
数据来源: Taylor
摘要:
The Raman spectra of Terepthalylidene-bis-p-n-declyaniline (TBDA), have been recorded as a function of temperature in the temperature range from 55.0°C (solid) to 199.0°C (isotropic liquid) in the 1100–1200cm−1and 1520–1650cm−1regions. The precise values of peak positions, integrated intensities and linewidths of some selected Raman bands have been obtained by deconvoluting the bands. The changes in the molecular alignment and its effect on inter/intra molecular interactions at two particular phase transitionsviz., solid-smecticG (K-SG) and smecticI-SmecticC (SI-Sc) have been discussed on the basis of variation in the Raman spectral parameters with temperature. From detailed considerations, it is inferred that the increased orientational/vibrational freedom of long alkyl chain on the core is responsible for major spectral changes at theK-SGtransition while the changes in the intramolecular interactions of the core part with increased fluidity, is responsible for spectral anomalies at theSI-Sctransition.
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