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Type: Artigo de periódico
Title: Gas-phase reactions for selective detection of the explosives TNT and RDX
Author: Meurer, EC
Chen, H
Riter, L
Cotte-Rodriguez, I
Eberlin, MN
Cooks, RG
Abstract: Highly selective gas-phase reactions with ethyl vinyl ether (EVE) of major electron (EI) and chemical ionization (CI) fragment ions of the explosives TNT and RDX have been uncovered. The fragment ion of m/z 210 from TNT undergoes [4(+) + 2] cycloaddition with EVE to form an oxo-iminium ion of m/z 282, which dissociates by acetaldehyde loss after a [1,5-H] shift to form a quinolynium ion of m/z 238. The fragment ion of m/z 149 from RDX reacts with EVE by a formal vinylation reaction, that is, the elusive cyclic adduct loses ethanol to yield a nitro-iminium ion of m/z 175, which reacts further with EVE to form a second cyclic product ion of m/z 247. Calculations and MS/MS experiments support the proposed structures. These highly characteristic reactions of diagnostic El and CI fragment ions improve selectivity for TNT and RDX detection.
Country: Inglaterra
Editor: Royal Soc Chemistry
Citation: Chemical Communications. Royal Soc Chemistry, n. 1, n. 40, n. 41, 2004.
Rights: embargo
Identifier DOI: 10.1039/b309962h
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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