Fourier transform infrared spectroscopic study of the kinetics of a first-order phase transition in tridecanoic acid CH3(CH2)11COOH

The structural changes in crystalline lamella cores of tridecanoic acid CH 3 (CH 2 ) 11 COOH during heating in the range from the temperature T 1 = 13.5°C to T 2 > T m = 41.6°C have been investigated using Fourier transform infrared spectroscopy. The behavior of the bands of rocking (in the regio...

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Bibliographic Details
Published in:Physics of the solid state 2017-02, Vol.59 (2), p.331-337
Main Authors: Marikhin, V. A., Myasnikova, L. P., Radovanova, E. I., Volchek, B. Z., Medvedeva, D. A.
Format: Article
Language:English
Subjects:
Banded structure
Fourier transforms
Infrared analysis
Infrared spectroscopy
Optical Properties
Phase transitions
Physics
Physics and Astronomy
Solid State Physics
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Summary:The structural changes in crystalline lamella cores of tridecanoic acid CH 3 (CH 2 ) 11 COOH during heating in the range from the temperature T 1 = 13.5°C to T 2 > T m = 41.6°C have been investigated using Fourier transform infrared spectroscopy. The behavior of the bands of rocking (in the region of 720 cm –1 ) and bending (in the region of 1470 cm –1 ) vibrations of CH 2 groups in tridecanoic acid methylene segments has been analyzed. It has been shown that, in the first-order phase transition region ( T s–s ~ 36°C) within a narrow temperature range (Δ T 1 ≤ 1 K), there is a gradual transformation of the initial triclinic subcell into the hexagonal subcell. The mechanism of this transition has been considered in terms of the theory of diffuse first-order phase transitions.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783417020184