(489b) Structure and Application of Hydrogen Bond in Ionic Liquid

Ionic liquids (ILs) have attracted considerable attentions in academia and industries due to their unique properties and potential applications. A fundamental question is “what is the force to determine the properties of ILs.” As the structural directing contributor, hydrogen bonds are responsible for ionic pairing, stacking and self-assembling, and then influence their properties. ^1,2

In term of structure, coupling with the strong electrostatic force, hydrogen bonds in ILs are very different from the common solvents, such as water. ³ More interestingly, the hydrogen bonds can be extended into a 3D network that is the essential interactive fashion and structural units and determine the many properties of ILs. ⁴

Involving in some important applications of ILs, hydrogen bonds also play the critical roles.⁵ The typical example is the dissolution of cellulose in ILs that involves in the two steps hydrogen bonded interactions essentially.⁶ The first is to break the hydrogen bonded network inside cellulose, then the active anion can interact with the hydroxyl protons of cellulose by forming hydrogen bonds. Another, such as catalytic reactions and natural bioactive homologous separation, even as the interfere of ILs-electrolyte in lithium batteries, involve in hydrogen bonds. Therefore, the deep insights into hydrogen bonds can provide us with a rational design for the new ILs to fulfill the demands in multiscale studies of ILs.

References:

(1) Dong, K.; Zhang, S.; Wang, J. Understanding the Hydrogen Bonds in Ionic Liquids and Their Roles in Properties and Reactions. Chem. Commun. 2016, 52, 6744.

(2) Dong, K.; Zhang, S. Hydrogen Bonds: A Structural Instight into Ionic Liquids. Chem. Eur. J. 2012, 18, 2748.

(3) Dong, K.; Wang, Q.; Zhang, S. A New Class of Ion-Ion Interaction: Z-Bond. Sci. China Chem. 2015, 58, 495.

(4) Fumino, K.; Peppel, T.; Geppert-Rybczyńska, M.; Zaitsau, D. H.; Lehmann, J. K.; Verevkin, S. P.; Köckerling, M.; Ludwig, R. The Influence of Hydrogen Bonding on the Physical Properties of Ionic Liquids. Phys. Chem. Chem. Phys. 2011, 13, 14064.

(5) Zhang, S.; Sun, J.; Zhang, X.; Xin, J.; Miao, Q.; Wang, J. Ionic Liquid-based Green Processes for Energy Production. Chem. Soc. Rev. 2014, 43, 7838.

(6) Li, Y.; Liu, X.; Zhang, S.; Yao, Y.; Yao, X.; Xu, J.; Lu, X. Phys. Chem. Chem. Phys. 2015, 17, 17894.