Abstract
Carbohydrates have drawn considerable interest from researchers recently due to their affinity for CO2. However, most of the research in this field has focused on peracetylated derivatives. Compared with acetylated carbohydrates, which have already been studied in depth, methyl d-glucopyranoside derivatives are more stable and could have additional applications. Thus, in the present work, ab initio calculations were performed to elucidate the characteristics of the interactions of methylglucoside derivatives with CO2, and to investigate how the binding energy (ΔE) is affected by isomerization or the introduction of various acyl groups. Four methyl d-glucopyranosides (each with two anomers) bearing acetyl, propionyl, butyryl, and isobutyryl moieties, respectively, were designed as substrates, and the 1:1 complexes of a CO2 molecule with each of these sugar substrates were modeled. The results indicate that ΔE is mainly influenced by interaction distance and the number of negatively charged donors or interacting pairs in the complex; the structure of the acyl group present in the substrate is a secondary influence. Except in the case of methyl 2-O-acetyl-d-glucopyranose, the ΔE values of the α- and β-anomers of each methylglucoside were found to be almost the same. Therefore, we would expect the CO2 affinities of the four derivatives studied here to be as strong as or even stronger than that of peracetylated d-glucopyranose.
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Notes
Please note that, in this paper, a “larger” energy is an energy that is larger in magnitude than another energy, and a “smaller” energy is an energy that is smaller in magnitude than another energy. Thus, ΔE of II(a) is larger than ΔE of I(a), even though the ΔE of II(a) is more negative than the ΔE of I(a).
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The authors would like to acknowledge the financial support from the Natural Science Foundation of China (no. 21106172), and the Natural Science Foundation for Youths of Shanxi (2013021008-7).
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Chang, H.H., Cao, R.X., Yang, C.C. et al. Interactions of acylated methylglucoside derivatives with CO2: simulation and calculations. J Mol Model 22, 39 (2016). https://doi.org/10.1007/s00894-015-2903-y
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DOI: https://doi.org/10.1007/s00894-015-2903-y