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. 2023 Jul 17:19:1021-1027.
doi: 10.3762/bjoc.19.78. eCollection 2023.

CO2 complexation with cyclodextrins

Cecilie Høgfeldt Jessen  1 , Jesper Bendix  1 , Theis Brock Nannestad  1 , Heloisa Bordallo  1 , Martin Jæger Pedersen  1 , Christian Marcus Pedersen  1 , Mikael Bols  1
Affiliations

CO2 complexation with cyclodextrins

Cecilie Høgfeldt Jessen et al. Beilstein J Org Chem. .

Abstract

Carbon dioxide (CO2) emissions from industrial processes, power generation, and transportation contribute significantly to global warming and climate change. Carbon capture and storage (CCS) technologies are essential to reduce these emissions and mitigate the effects of climate change. Cyclodextrins (CDs), cyclic oligosaccharides, are studied as potential CO2 capture agents due to their unique molecular structures and high selectivity towards CO2. In this paper we have investigated binding efficiency of a number of cyclodextrins towards CO2. It is found that the crystal structure of α-cyclodextrin with CO2 has a 1:1 stoichioimetry and that a number of simple and modified cyclodextrins bind CO2 in water with a Kg of 0.18-1.2 bar-1 (7-35 M-1) with per-O-methyl α-cyclodextrin having the highest CO2 affinity.

Keywords: carbon dioxide; crystals; cyclodextrin; gas binding.

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Figures

Figure 1
Figure 1
Structure of cyclodextrins 1–6 studied in this work.
Figure 2
Figure 2
X-ray crystal structure of CO2 bound to α-CD.
Figure 3
Figure 3
TGA curve (blue) and dTGA curve (red) for CO2-1 crystals. Two lumps are seen with the former predominantly being CO2 and the second pre-dominantly water.
Figure 4
Figure 4
Cell used to measure vis spectra under pressure (left), structure of 7 (middle) and spectrum of 7 (40 μM) and 1 (2 mM) in citrate phospate buffer pH 3 (right) from 350–400 nm with 0 (blue), 2 (red), 4 (green), 6 (orange) and 8 (grey) bar of CO2.
Figure 5
Figure 5
Binding of CO2 to 1 as a function of pressure.
See this image and copyright information in PMC

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