A new phase transition in supercooled TBDA probed by low-temperature Raman study

被引：0
|
作者：
Dash, SK
Singh, RK
Asthana, BP [1 ]
Alapati, PR
Verma, AL
机构：
[1] Banaras Hindu Univ, Dept Phys, Laser & Spect Lab, Varanasi 221005, Uttar Pradesh, India
[2] NE Reg Inst Sci & Technol, Dept Phys, Itanagar 791109, India
[3] Jai Prakash Univ, Rajendra Coll, Dept Phys, Chapra 841301, India
[4] NE Hill Univ, Dept Phys, Shillong 793022, Meghalaya, India
来源：
JOURNAL OF RAMAN SPECTROSCOPY | 1999年 / 30卷 / 02期
关键词：
D O I：
10.1002/(SICI)1097-4555(199902)30:2<81::AID-JRS348>3.0.CO;2-Z
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
Raman spectra of terephthalidenebis-p-n-decylaniline (TBDA) were recorded in the regions 925-1000 and 1120-1220 cm(-1) from room temperature down to 20 K during both cooling and heating cycles. The subtle changes in the spectral features of the bands at ca 975 and ea 1195 cm(-1) at 47 It were attributed to a hitherto unreported stable-metastable phase transition in TBDA, The dynamics of the new phase transition are explained in terms of splitting of the non-planar mode at ca 975 cm-l due to strong steric hindrances caused by increased intermolecular interactions due to close packing in the low-temperature phase. Copyright (C) 1999 John Wiley & Sons, Ltd.
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页码：81 / 84
页数：4
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