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Temperature dependence of the Raman spectrum of 1-(4-chlorophenyl)-3-(2-thienyl)prop-2-en-1-one

De Toledo, T. A. and Da Costa, R. C. and Abdulghani Al-Maqtari, Helmi Mohammed and Jamalis, Joazaizulfazli and Pizani, P. S. (2017) Temperature dependence of the Raman spectrum of 1-(4-chlorophenyl)-3-(2-thienyl)prop-2-en-1-one. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 180 . pp. 9-17. ISSN 1386-1425

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Official URL: http://dx.doi.org/10.1016/j.saa.2017.02.051

Abstract

The heterocyclic chalcone containing thiophene ring 1-(4-chlorophenyl)-3-(2-thienyl)prop-2-en-1-one, C13H9ClOS was synthesized and investigated using experimental techniques such as nuclear magnetic resonance (1H and 13C NMR), Fourier transform infrared spectroscopy (FTIR) at room temperature, differential scanning calorimeter (DSC) from room temperature to 500 K and Raman scattering at the temperature range 10–413 K in order to study its structure and vibrational properties as well as stability and possible phase transition. Density functional theory (DFT) calculations were performed to determine the vibrational spectrum viewing to improve the knowledge of the material properties. A reasonable agreement was observed between theoretical and experimental Raman spectrum taken at 10 K since anharmonic effects of the molecular motion is reduced at low temperatures, leading to a more comprehensive assignment of the vibrational modes. Increasing the temperature up to 393 K, was observed the typical phonon anharmonicity behavior associated to changes in the Raman line intensities, line-widths and red-shift, in special in the external mode region, whereas the internal modes region remains almost unchanged due its strong chemical bonds. Furthermore, C13H9ClOS goes to melting phase transition in the temperature range 393–403 K and then sublimates in the temperature range 403–413 K. This is denounced by the disappearance of the external modes and the absence of internal modes in the Raman spectra, in accordance with DSC curve. The enthalpy (ΔH) obtained from the integration of the endothermic peak in DSC curve centered at 397 K is founded to be 121.5 J/g.

Item Type:Article
Additional Information:RADIS System Ref No:PB/2017/11735
Uncontrolled Keywords:Phonon anharmonicity, DFT calculations
Subjects:Q Science
Divisions:Science
ID Code:66431
Deposited By: Fazli Masari
Deposited On:30 Nov 2017 09:03
Last Modified:30 Nov 2017 09:03

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