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Photoluminescence spectroscopy of 2-nitrotoluene and its photo and photothermal decomposition derivatives

Paper ID Volume ID Publish Year Pages File Format Full-Text
26453 43953 2013 8 PDF Available
Title
Photoluminescence spectroscopy of 2-nitrotoluene and its photo and photothermal decomposition derivatives
Abstract

•Thermal, photo, and photothermal aging of 2-nitrotoluene are performed.•2-Nitrosotoluene, toluene, 2-cresol, and 2-toluidine are the gas-phase decomposition products.•Optical signatures of 2-nitrotoluene and the decomposition products are determined.•NO and C (I) are observed in the spectrum of 2-nitrotoluene.•2-Cresol appears to be a good candidate to detect aged 2-nitrotoluene.

2-Nitrotoluene (2-NT) is subjected to thermal, photo, and photothermal aging to determine its gas-phase decomposition products via GC/MS. Besides 2-nitrotoluene, the following decomposition products are detected in the gas phase: toluene, 2-nitrosotoluene, 2-cresol, and 2-toluidine. Time resolved laser spectroscopy is used to identify the spectroscopic signatures of these gas-phase products. 2-Nitrotoluene photodissociates during the measurement, leading to the formation of NO and atomic carbon C I, and the observation of their characteristic spectroscopic signatures. Energy transfer between molecular nitrogen and NO is observed. A spectroscopic signature from 2-nitrotoluene in nitrogen with concentrations as low as about 100 ppt is observed. The toluene spectra show a broad emission centered at about 280 nm. The spectroscopic signature of 2-nitrosotoluene is similar to that of 2-NT, and the spectrum is dominated by emission from NO. However, unlike for 2-nitrotoluene, no C I is observed and energy transfer from nitrogen is not apparent. Even with a poorly matched excitation wavelength, the spectrum of 2-cresol shows a strong and broad emission peak centered at about 300 nm, which is promising for the detection of aged 2-nitrotoluene. No useful spectroscopic signatures are seen in the spectra of 2-toluidine.

Keywords
2-Nitrotoluene; Photo aging; Photothermal aging; Photoluminescence
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Photoluminescence spectroscopy of 2-nitrotoluene and its photo and photothermal decomposition derivatives
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 268, 15 September 2013, Pages 50–57
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us