Dynamical heterogeneities in ionic liquids as revealed from deuteron NMR

Chemical Communications : Chem Comm
Alexander E KhudozhitkovRalf Ludwig

Abstract

The heterogeneity in dynamics has important consequences for understanding the viscosity, diffusion, ionic mobility, and the rates of chemical reactions in technology relevant systems such as polymers, metallic glasses, aqueous solutions, and inorganic materials. Herein, we study the spatial and dynamic heterogeneities in ionic liquids by means of solid state NMR spectroscopy. In the2H spectra of the protic ionic liquid [TEA][OTf] we observe anisotropic and isotropic signals at the same time. The spectra measured below the melting temperature at 306 K could be simulated by a superposition of the solid and liquid line shapes, which provided the transition enthalpies between the rigid and mobile fractions. Consequently, we measured the spin-lattice relaxation times T1for the anisotropic and the isotropic signals for the temperature range between 203 and 436 K. Both dispersion curves could be fitted to models including rotational correlation times, activation barriers and rate constants. This approach allowed determining the rotational correlation times for the N-D molecular vector of the [TEA]+cation in differently mobile environments. The mobility is only slightly different, as indicated by small differences in activation energi...Continue Reading

References

May 2, 2002·Journal of the American Chemical Society·Richard P SwatloskiRobin D Rogers
Nov 1, 2003·Science·Robin D Rogers, Kenneth R Seddon
Jan 19, 2006·Proceedings of the National Academy of Sciences of the United States of America·Zhonghan Hu, Claudio J Margulis
Jan 17, 2008·Chemical Society Reviews·Natalia V Plechkova, Kenneth R Seddon
Jul 25, 2009·Nature Materials·Michel ArmandBruno Scrosati
Nov 26, 2010·Annual Review of Physical Chemistry·Edward W CastnerJames F Wishart
Sep 16, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·E J Maginn
Mar 30, 2012·Faraday Discussions·Jelena StoimenovskiDouglas R MacFarlane
Jan 18, 2013·Angewandte Chemie·Koichi FuminoRalf Ludwig
Jul 25, 2015·The Journal of Physical Chemistry. B·Tatsiana BurankovaJan P Embs
Apr 14, 2016·Physical Chemistry Chemical Physics : PCCP·Matthias StrauchRalf Ludwig
Dec 8, 2016·Topics in Current Chemistry·Rocco Mazzeo

❮ Previous
Next ❯

Methods Mentioned

BETA
neutron scattering
NMR

Software Mentioned

QENS

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.