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Applied Spectroscopy

Applied Spectroscopy

IF: 2.2
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Comparative Study of Ultraviolet Laser-Based Time-Resolved Photoacoustic Fingerprint Spectra and Thermal Decomposition Mechanisms of Energetic 1,2,3-1H-Triazole Derivatives Under Controlled Pyrolysis.

Published:1 July 2017 DOI: 10.1177/0003702817698147 PMID: 28345380
Konda Srinivasa Rao, Anil Kumar Chaudhary

Abstract

We report the comparative study of photoacoustic (PA) fingerprint spectra, thermal decomposition, and stability mechanism of some phenyl and bis series energetic compounds named 1-(2-methoxy,-3,5-dinitrophenyl)-1H-1,2,3-triazole ( S5), 1-(3-methoxy, 2, 6 dinitrophenyl) 1H-1, 2, 3 triazole ( S10), 1-(4-nitrophenyl)-1H-1,2,3-triazole ( S8), and 2,6-bis ((4-(nitromethyl)-1H-1,2,3-triazol-1-yl)methyl) pyridine ( S9). Fourth harmonic wavelength, i.e., 266?nm of pulse duration 7?ns and 10?Hz repetition rate obtained from Q-switched Nd: YAG laser, was used to record the thermal PA spectra of these compounds under controlled pyrolysis condition in the range of 30-350?℃. The PA fingerprint spectra are produced due to entire molecule vapor along with principal functional byproduct NO2 molecule. NO2 molecule is a major gas released during thermal decomposition due to weakest nature of C-NO2 bond. Further, NO2 molecules are involved in photodissociation process due to π*← n transition and converted into NO molecules inside the PA cell due to excitation by 266?nm wavelength. The combined results of PA and gas chromatography-mass spectrometry (GC-MS) spectra along with thermo gravimetric-differential thermal analysis (TG-DTA) data confirm the thermal decomposition mechanism process that can be completed in multiple steps. In addition, GC-MS spectra also confirm the release of NO and NO2 molecules. The effect of incident laser energy and data acquisition time has been carried out for understanding the behavior of acoustic modes. Finally, the thermal quality factor "Q" is measured to test the stability of compounds.

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Related products
Procduct Name CAS Molecular Formula Supplier Price
1,2,3-1H-Triazole 288-36-8 C2H3N3 536 suppliers $6.00-$1345.11
1-(Mesitylene-2-sulfonyl)-3-nitro-1,2,4-triazole 74257-00-4 C11H12N4O4S 182 suppliers $7.00-$2700.00
NITRIC OXIDE 10102-43-9 NO* 58 suppliers $479.00-$9930.00
1-BENZYL-4-(4-NITROPHENYL)PIPERAZINE 16155-08-1 C17H19N3O2 40 suppliers Inquiry
2,6-bis(3-bromophenyl)-4-phenylpyridine 123291-15-6 C23H15Br2N 14 suppliers Inquiry
hIL-13 Ra 1 DuoSet (1 KT) 4 suppliers Inquiry
NO2 2 suppliers Inquiry

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