Carbon Dioxide Capture by Amino Acids through an Arginine-Arginine Carbamate Ion Pair

Chi Yuan Cheng, Hongwei Shen, Nan Nan Shen, Cristina Castro, Viktor Dubovoy, Donghui Wu, Ravi Subramanyan, Xiao Ying Huang, Chloe E. Pitsch, Xiaotai Wang, Long Pan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A novel complex comprising an ion pair of arginine-arginine carbamate is reported herein, which is isolated from an aqueous l-arginine solution after reacting with CO2. Its structure was unambiguously elucidated via single-crystal X-ray diffraction, and its phase purity was confirmed by powder X-ray diffraction (PXRD) analysis. Nuclear magnetic resonance (NMR) studies suggested that the arginine carbamate complex hydrolyzed in aqueous conditions with a rate directly proportional to its concentration. Furthermore, density functional theory (DFT) calculations revealed how the amino group acted as a nucleophile to attack CO2to enable the ion-pair formation through a proton transfer between the arginine and arginine carbamate. The discovery of the arginine-CO2adduct expands our understanding of CO2fixation and can lead to the development of new methods of implementing l-arginine or other amino acids for CO2capture technology.

Original languageEnglish
Pages (from-to)17745-17749
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume60
Issue number48
DOIs
Publication statusPublished - 8 Dec 2021
Externally publishedYes

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