globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.jcou.2017.02.007
Scopus ID: 2-s2.0-85015205837
Title:
NMR spectroscopic investigations into the mechanism of absorption and desorption of CO2 by (tris-pyridyl)amine Zn complexes
Author: Arstad B.; Blom R.; Didriksen T.; Frøseth M.; Heyn R.H.; Oien-Odegaard S.
Source Publication: Journal of CO2 Utilization
ISSN: 22129820
Publishing Year: 2017
Volume: 19
pages begin: 58
pages end: 67
Language: 英语
Scopus Keyword: Absorption spectroscopy ; Carboxylation ; Desorption ; Nuclear magnetic resonance spectroscopy ; Solutions ; Zinc ; Absorption and desorptions ; Aqueous chemistry ; Atmospheric CO ; Decarboxylation process ; Dynamic equilibria ; NMR experiments ; Spectroscopic investigations ; Zinc carbonates ; Carbon dioxide
English Abstract: The Zn complex [(NN3)Zn(OH)]2(NO3)2 (1(NO3)2, NN3 = tris(2-pyridylmethyl)amine) reacts with atmospheric CO2 to form a zinc carbonate species {[(NN3)Zn]3CO3}(NO3)4 (2(NO3)4), isolable as a crystalline product from organic solvents. The aqueous chemistry of the CO2 absorption and desorption processes for 1(NO3)2 and the presumed end-point of the reaction, 2(NO3)4, was unknown and hence investigated by NMR spectroscopy. Carboxylation of aqueous solutions of both 1(NO3)2 and 2(NO3)4 form products that can best be described as mixtures of monomeric [(NN3)ZnCO3H]+ and dimeric {[(NN3)Zn]2CO3}2+, which are in a dynamic equilibrium on the NMR time-scale. No evidence for the involvement of 2(NO3)4 in the carboxylation-decarboxylation processes is observed. Rather, the data suggest that 2(NO3)4 provides [(NN3)Zn(OH2)]2+ that does not participate in the CO2 chemistry upon warming. A mechanism that is supported by NMR experiments and that accounts for the formation of [(NN3)ZnCO3H]+ and {[(NN3)Zn]2CO3}2+ from both ends of the reaction manifold is proposed. © 2017 Elsevier Ltd. All rights reserved.
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被引频次[WOS]:2   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/52734
Appears in Collections:影响、适应和脆弱性

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Recommended Citation:
Arstad B.,Blom R.,Didriksen T.,et al. NMR spectroscopic investigations into the mechanism of absorption and desorption of CO2 by (tris-pyridyl)amine Zn complexes[J]. Journal of CO2 Utilization,2017-01-01,19
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