Quantitative research on the vaporization and decomposition of [EMIM] [Tf2N] by thermogravimetric analysis – mass spectrometry / Yu Chen in Industrial & engineering chemistry research, Vol. 51 N° 21 (Mai 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7418–7427 Titre : Quantitative research on the vaporization and decomposition of [EMIM] [Tf2N] by thermogravimetric analysis – mass spectrometry Type de document : texte imprimé Auteurs : Yu Chen, Auteur ; Yuanyuan Cao, Auteur ; Yang Shi, Auteur Année de publication : 2012 Article en page(s) : pp. 7418–7427 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermogravimetric analysis Mass spectrometry Résumé : The thermal stability of [EMIM][Tf2N] was investigated by thermogravimetric analysis–mass spectrometry (TG–MS) in this study. It showed that [EMIM][Tf2N] decomposed at temperatures over 350 °C by Hoffman elimination and substitution of nucleophilic mechanisms (SN, including the unimolecular substitution nucleophilic reaction SN1 and the bimolecular substitution nucleophilic reaction SN2). The instability of [EMIM][Tf2N] is induced by decomposition of the anion [Tf2N] to a more nucleophilic group, such as NH2 and F, and then methyl and/or ethyl in the imidazolium cation are attacked by those groups of relatively high nucleophilic activity. Mass loss of [EMIM][Tf2N] in a nitrogen atmosphere can be attributed to its decomposition and/or vaporization. The ratios of decomposition and vaporization (Dec/Vap), elimination and SN (Elim/SN), and SN2/SN1 for [EMIM][Tf2N] were approximately determined by TG–MS. The thermal stability including both decomposition and vaporization of [EMIM][Tf2N] decreases with an increase of the temperature, while decomposition is more sensitive to the temperature than evaporation. Vaporization of [EMIM][Tf2N] dominates the mass loss at temperatures below 350 °C, while decomposition dominates the mass loss at temperatures over 350 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300247v [article] Quantitative research on the vaporization and decomposition of [EMIM] [Tf2N] by thermogravimetric analysis – mass spectrometry [texte imprimé] / Yu Chen, Auteur ; Yuanyuan Cao, Auteur ; Yang Shi, Auteur . - 2012 . - pp. 7418–7427. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7418–7427 Mots-clés : Thermogravimetric analysis Mass spectrometry Résumé : The thermal stability of [EMIM][Tf2N] was investigated by thermogravimetric analysis–mass spectrometry (TG–MS) in this study. It showed that [EMIM][Tf2N] decomposed at temperatures over 350 °C by Hoffman elimination and substitution of nucleophilic mechanisms (SN, including the unimolecular substitution nucleophilic reaction SN1 and the bimolecular substitution nucleophilic reaction SN2). The instability of [EMIM][Tf2N] is induced by decomposition of the anion [Tf2N] to a more nucleophilic group, such as NH2 and F, and then methyl and/or ethyl in the imidazolium cation are attacked by those groups of relatively high nucleophilic activity. Mass loss of [EMIM][Tf2N] in a nitrogen atmosphere can be attributed to its decomposition and/or vaporization. The ratios of decomposition and vaporization (Dec/Vap), elimination and SN (Elim/SN), and SN2/SN1 for [EMIM][Tf2N] were approximately determined by TG–MS. The thermal stability including both decomposition and vaporization of [EMIM][Tf2N] decreases with an increase of the temperature, while decomposition is more sensitive to the temperature than evaporation. Vaporization of [EMIM][Tf2N] dominates the mass loss at temperatures below 350 °C, while decomposition dominates the mass loss at temperatures over 350 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300247v

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