Microscopic structure, interaction, and properties of a guanidinium-based ionic liquid and its mixture with CO2 / Xiaochun Zhang in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8323-8332 Titre : Microscopic structure, interaction, and properties of a guanidinium-based ionic liquid and its mixture with CO2 Type de document : texte imprimé Auteurs : Xiaochun Zhang, Auteur ; Xiaomin Liu, Auteur ; Xiaoqian Yao, Auteur Année de publication : 2011 Article en page(s) : pp. 8323-8332 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon dioxide Ionic liquid Résumé : Recently, the guanidinium-based ionic liquid N,N,N',N',N"-pentamethyl-N"-propylguanidinium tetrafluoroborate ([ppg] [BF4]) was found to be able to effectively absorb CO2 (Amitesh, M. ChemSusChem 2009, 2, 628). In this work, molecular dynamics (MD) simulations and ab initio calculations were performed to investigate the microscopic structure, interactions, and properties of pure ionic liquid [ppg][BF4] and mixtures of [ppg][BF4] (1) and CO2 (2) at x2 = 0, 0.1, 0.3, 0.5, 0.6. C-H···F hydrogen bonds were found to exist between [ppg] cations and [BF4] anions by ab initio calculations. However, the H···F coordination numbers suggest that the H···F interaction decreases slightly with increasing CO2 concentration. CO2 molecules were found to be primarily distributed around the anions, as seen from the CO2-cation and CO2-anion radial distribution functions (RDFs) calculated from molecular dynamic simulations. The cation-anion and anion-anion structures were not perturbed even with addition of CO2 up to 0.6 mol fraction, whereas the cation-anion and anion-anion interactions decreased with increasing CO2 concentration. The volume expansion and diffusion of [ppg][BF4] increased with increasing CO2 concentration. In addition, according to the results of RDFs and spatial distribution functions, the distribution areas of CO2 molecules and [ppg] cations around [BF4] anions were found to be nearly complementary. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332158 [article] Microscopic structure, interaction, and properties of a guanidinium-based ionic liquid and its mixture with CO2 [texte imprimé] / Xiaochun Zhang, Auteur ; Xiaomin Liu, Auteur ; Xiaoqian Yao, Auteur . - 2011 . - pp. 8323-8332. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8323-8332 Mots-clés : Carbon dioxide Ionic liquid Résumé : Recently, the guanidinium-based ionic liquid N,N,N',N',N"-pentamethyl-N"-propylguanidinium tetrafluoroborate ([ppg] [BF4]) was found to be able to effectively absorb CO2 (Amitesh, M. ChemSusChem 2009, 2, 628). In this work, molecular dynamics (MD) simulations and ab initio calculations were performed to investigate the microscopic structure, interactions, and properties of pure ionic liquid [ppg][BF4] and mixtures of [ppg][BF4] (1) and CO2 (2) at x2 = 0, 0.1, 0.3, 0.5, 0.6. C-H···F hydrogen bonds were found to exist between [ppg] cations and [BF4] anions by ab initio calculations. However, the H···F coordination numbers suggest that the H···F interaction decreases slightly with increasing CO2 concentration. CO2 molecules were found to be primarily distributed around the anions, as seen from the CO2-cation and CO2-anion radial distribution functions (RDFs) calculated from molecular dynamic simulations. The cation-anion and anion-anion structures were not perturbed even with addition of CO2 up to 0.6 mol fraction, whereas the cation-anion and anion-anion interactions decreased with increasing CO2 concentration. The volume expansion and diffusion of [ppg][BF4] increased with increasing CO2 concentration. In addition, according to the results of RDFs and spatial distribution functions, the distribution areas of CO2 molecules and [ppg] cations around [BF4] anions were found to be nearly complementary. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332158

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