Solvation and Ion-Pairing Effects of Choline Acetate Electrolyte in Protic and Aprotic Solvents Studied by NMR Titrations.

ABSTRACT: Choline-based electrolytes have been proposed as environmentally friendly and low-cost alternatives for secondary zinc air batteries. Choline acetate [Ch]⁺ [OAc]^- in protic (D₂ O) and aprotic (DMSO-d₆ ) solvents has been studied by means of concentration-dependent ¹ H NMR, viscosity, and density measurements. The viscosities have been calculated on the basis of the Jones-Dole equation and showed that the dominant contribution originates from short-range ion-solvent interactions. Site-specific association affinities were assigned from NMR chemical shift titrations. In DMSO-d₆ , the hydroxyl group of choline was found to have the smallest dissociation constant followed by the methyl group of acetate. The corresponding Gibbs en

SUBMITTER: Veroutis E 

PROVIDER: S-EPMC9297985 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature