Glucose in dry and moist ionic liquid: vibrational circular dichroism, IR, and possible mechanisms

Physical Chemistry Chemical Physics : PCCP
Jan BlasiusBarbara Kirchner

Abstract

Ionic liquids and their mixtures with water show remarkable features in cellulose processing. For this reason, understanding the behavior of carbohydrates in ionic liquids is important. In the present study, we investigated three d-glucose isomers (α, β and open-chain) in 1-ethyl-3-methylimidazolium acetate in the presence and absence of water, through ab initio molecular dynamics simulations. In the complex hydrogen bonding network of these mixtures, the most interesting observation is that upon water addition every hydrogen bond elongates, except the glucose-glucose hydrogen bond for the open-chain and the α-form which shortens, clearly showing the beginning of the crystallization process. The ring glucose rearranges from on-top to in-plane and the open form changes from a coiled to a more linear arrangement when adding water which explains the contradiction that the center of mass distances of the glucose molecules with other glucose molecules grow while the hydrogen bonds shorten. The appearance of coiled open forms indicates that the previously suggested isomerization between these forms is possible and might play a role in the solubility of the related carbohydrates. The calculated IR and VCD spectra reveal insight into t...Continue Reading

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Citations

Jul 2, 2020·Chemistry : a European Journal·Sascha Gehrke, Oldamur Holloczki
Aug 5, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Martin BrehmJörg Kressler
Jul 29, 2021·The Journal of Organic Chemistry·Jan BlasiusBarbara Kirchner
Sep 3, 2021·The Journal of Chemical Physics·Vahideh Alizadeh, Barbara Kirchner

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Methods Mentioned

BETA
circular dichroism

Software Mentioned

TRAVIS
AIMD

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