Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/99220
Full metadata record
DC FieldValueLanguage
dc.contributor.authorChua, Chun Kiangen
dc.contributor.authorPumera, Martinen
dc.contributor.authorRulíšek, Lubomíren
dc.date.accessioned2013-11-05T04:47:35Zen
dc.date.accessioned2019-12-06T20:04:47Z-
dc.date.available2013-11-05T04:47:35Zen
dc.date.available2019-12-06T20:04:47Z-
dc.date.copyright2012en
dc.date.issued2012en
dc.identifier.citationChua, C. K., Pumera, M., & Rulíšek, L. (2012). Reduction Pathways of 2,4,6-Trinitrotoluene: An Electrochemical and Theoretical Study. The Journal of Physical Chemistry C, 116(6), 4243-4251.en
dc.identifier.urihttps://hdl.handle.net/10356/99220-
dc.description.abstractThe reduction pathways of trinitrotoluene are studied using electrochemical and computational methods. The electrochemical reduction of three nitro groups in 2,4,6-trinitrotoluene (TNT) is characterized by three major reduction peaks in cyclic voltammograms at the peak potentials of −0.310, −0.463, and −0.629 V vs a normal hydrogen electrode (NHE). The second and third peaks coincide with the two peaks observed for the 2-amino-4,6-dinitrotoluene (at the potentials of −0.475 and −0.627 V vs NHE), whereas the two peaks in the 4-amino-2,6-dinitrotoluene voltammograms appear at −0.537 and −0.623 V and deviate more significantly from the corresponding two peaks in 2,4,6-trinitrotoluene. It suggests that the first NO2 group reduced in the overall process is the one in ortho position with respect to the CH3 group. Analogously, the 2,6-diamino-4-nitrotoluene exhibits a reduction peak at −0.629 V, almost identical to the third and second reduction peaks of 2,4,6-trinitrotoluene and 2-amino-4,6-dinitrotoluene, respectively. Since the other isomer, 2,4-diamino-6-nitrotoluene, exhibits a reduction peak at −0.712 V, we conclude that the second reduction occurs also in the ortho position with respect to the methyl group. Most of these observations are corroborated by quantum chemical calculations, which yielded reduction potentials in a good agreement with the experimental values (in relative scale). Thus, studying in detail all of the possible protonation and redox states in the reduction of the first nitro group and the key steps in the reduction of the second and third nitro groups, we have obtained a comprehensive and detailed picture of the mechanism of the full 18e–/18H+ reduction of TNT. Last but not least, the calculations have shown that the thermodynamic stabilities of (isomeric) neutral radical species (X +e–+ H+)—presumably the regioselectivity-determining steps in the 6e–/6H+ reductions of the individual NO2 groups—are within 2 kJ·mol–1 (i.e., comparable to RT). Therefore, the course of the reduction can be governed by the effect of the surroundings, such as the enzymatic environment, and a different regioselectivity can be observed under biological conditions.en
dc.language.isoenen
dc.relation.ispartofseriesThe journal of physical chemistry Cen
dc.titleReduction pathways of 2,4,6-trinitrotoluene : an electrochemical and theoretical studyen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen
dc.identifier.doi10.1021/jp209631xen
item.fulltextNo Fulltext-
item.grantfulltextnone-
Appears in Collections:SPMS Journal Articles

SCOPUSTM   
Citations 5

59
Updated on Mar 7, 2021

PublonsTM
Citations 5

59
Updated on Mar 7, 2021

Page view(s) 50

317
Updated on Apr 16, 2021

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.