Terahertz Spectroscopy of 2,4-Dinitrotoluene over a Wide Temperature Range (7-245 K)

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Author list: Lepodise LM, Horvat J, Lewis RA

Publisher: American Chemical Society

Place: WASHINGTON

Publication year: 2015

Journal: The Journal of Physical Chemistry A (1089-5639)

Journal acronym: J PHYS CHEM A

Volume number: 119

Issue number: 2

Start page: 263

End page: 270

Number of pages: 8

ISSN: 1089-5639

eISSN: 1520-5215

Languages: English-Great Britain (EN-GB)

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Abstract

Previous THz spectroscopy of the TNT explosive precursor, 2,4-dinitrotoluene (DNT), has been restricted to room temperature (apart from one set of data at 11 K). Here, for the first time, we investigate the spectrum as the temperature is systematically varied, from 7 to 245 K. Many new features appear in the spectrum on cooling below room temperature. As well as the five absorption lines observed previously, we observe five additional lines. In addition, a new room-temperature line at 8.52 THz (281 cm(-1)) is observed. Six of the lines red-shift with temperature and four of them blue-shift. The blue shift is explained by interplay between intramolecular and intermolecular hydrogen bonds. The variation in line width and line intensity with temperature is not systematic, although a conspicuous decrease in line intensity with temperature is observed in all cases. Modeling with hybrid PBE0 and TPSSh functionals helps identify absorption modes.

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