We investigate the ionic conductivities, phase behaviors, conformational states, and interactions of three ionic liquids based on imidazolium cations and phosphonate anions with varying alkyl chain lengths. All three ionic liquids show high conductivities, with 1,3-dimethylimidazolium methyl-phosphonate [DiMIm(MeO)(H)PO2] being the most conductive (7.3 × 10(-3) S cm(-1) at 298 K). The high ionic conductivities are a result of the low glass-transition temperatures, Tg, which do not change significantly upon changing the cation and/or anion size. However, there is a slight dependence of the temperature behavior of the conductivity on the size of the ions, as seen from the fragility parameter (D) obtained from fits to the Vogel-Fulcher-Tammann equation. The molecular-level structure and interactions of the phosphonate anions were examined by Raman spectroscopy and first-principles calculations. The calculations identify two stable conformations for the methyl- and ethyl-phosphonate anions by rotation of the methyl and ethyl groups, respectively. The broad Raman signatures of the anions suggest the coexistence of two anion conformers in the ionic liquids and non-negligible cation-anion interactions, with a dependence on the position and shape of the bands of the cation species and the alkyl group of the anion.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/jp4042974 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Cellulose-enhanced MoS bifunctional hydrogel for efficient methylene blue degradation, human body sensing, and recyclability.
Int J Biol Macromol
January 2025
School of Chemical Engineering, Changchun University of Technology, Changchun 130012, China.
In this study, the dispersion behavior of MoS₂ in ionic liquids (ILs) with varying alkyl chain lengths was the primary focus of investigation, followed by the design of a novel PAM/SMA/CMC/PDA@MoS hydrogel. By optimizing the concentrations of CMC and PDA@MoS, a bifunctional hydrogel with both sensing and catalytic functions was successfully developed. Mechanical tests revealed that the PAM/SMA/CMC/0.
View Article and Find Full Text PDFHigh energy density solid state symmetric supercapacitors using ionic liquid dispersed Li ion-perovskites.
RSC Adv
January 2025
Department of Physics, BITS Pilani-Pilani Campus RJ-333031 India
The study reports solid-state ceramic supercapacitors (SSCs) assembled using a novel composite electrolyte based on Li ion conducting perovskite-type LLTO (LiLaTiO) and an ionic liquid (EMIM BF). Small amounts of various ionic liquids (ILs) were added to LLTO to enhance the ionic conductivity and improve electrode compatibility. The optimal composition with approximately ∼6 wt% EMIM BF in LLTO exhibited a high ionic conductivity of around ∼10 Ω cm at room temperature, nearly three orders of magnitude higher than that of the pristine LLTO.
View Article and Find Full Text PDFExploring Biophysical and Chemoinformatics Approaches for Interactions of Ionic Liquids with Hemoglobin, DNA, BSA, and HSA.
Chem Biodivers
January 2025
SRM Institute of Science and Technology - NCR Campus, chemistry, Department of Chemistry, SRM Institute of Science and Technology, Delhi NCR Camp, India, 241405, Modinagar, INDIA.
This review paper provides an inclusive overview of the intricate interactions amid ionic liquids (ILs) and essential biomacromolecules, mainly Hemoglobin (Hb), Bovine Serum Albumin (BSA), Human Serum Albumin (HSA), and Calf Thymus-DNA (CT-DNA). ILs have recently become a topic of great attention because of their inimitable physicochemical properties and potential uses in different fields. The review systematically explores the binding mechanisms, thermodynamics, and structural changes induced by ILs on Hb, BSA, HSA, and CT-DNA using spectroscopic, thermodynamic, and computational techniques.
View Article and Find Full Text PDFAxially Chiral TADF Imidazolium Salts for Circularly Polarized Light-Emitting Electrochemical Cells.
Angew Chem Int Ed Engl
January 2025
Institute of Chemistry Chinese Academy of Sciences, CAS Key Laboratory of Molecular Recognition and Function, CHINA.
A pair of axially chiral thermally activated delayed fluorescent (TADF) enantiomers, R-TCBN-ImEtPF6 and S-TCBN-ImEtPF6, with intrinsic ionic characteristics were efficiently synthesized by introducing imidazolium hexafluorophosphate to chiral TADF unit. The TADF imidazolium salts exhibited a high photoluminescence quantum yield (PLQY) of up to 92%, a small singlet-triplet energy gap (∆EST) of 0.04 eV, as well as reversible redox properties.
View Article and Find Full Text PDFThermodynamic regulation of carbon dioxide capture by functionalized ionic liquids.
Chem Soc Rev
January 2025
Department of Chemistry, Center of Chemistry for Frontier Technologies, Zhejiang University, Hangzhou 310027, China.
Carbon dioxide capture has attracted worldwide attention because CO emissions cause global warming and exacerbate climate change. Ionic liquids (ILs) have good application prospects in carbon capture due to their excellent properties, which provide a new chance to develop efficient and reversible carbon capture systems. This paper reviews the recent progress in CO chemical absorption by ILs, such as N-site, O-site, C-site, and multi-site functionalized ILs.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!