Microviscosity and Micropolarity Effects of Imidazolium Based Ionic Liquids Investigated by Spin Probes Their Diffusion and Spin Exchange
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R. Stoesser
Different polar common spin probes (TEMPO, TEMPOL, and CAT-1) as well as 15N spin probes (15N-TEMPO and 15N-TEMPOL-D17) were investigated to get information about microviscosity and micropolarity of ionic liquids. Rotational correlation times and hyperfine coupling constants of the spin probes were obtained by complete simulation of the ESR spectra. Microviscosity effects as shown by the Gierer–Wirtz theory may explain the spin probe behavior. Investigation of spin exchange of TEMPO, TEMPOL, and CAT-1 dissolved in ionic liquids shows an increased tendency of aggregation in the case of the nonpolar spin probe TEMPO. Two different kinds of species (isolated and aggregated species) were observed in the case of the more polar spin probes TEMPOL and CAT-1. ESR tomographic investigation of lateral diffusion of selected spin probes in an ionic liquid corresponds to the results obtained in rotational diffusion experiments. Furthermore, the strongly decreased mobility of radicals in ionic liquids makes detection of a polymer radical possible that was observed during thermal induced free radical polymerization of a methacrylate substituted by a sulfobetaine structure.
© Oldenbourg Wissenschaftsverlag
Articles in the same Issue
- Preface: 92nd Bunsenkolloquium – Physical Chemistry in Ionic Liquids
- Relaxation Dynamics upon Ultrashort UV Photo-Excitation of an Iodide Doped Ionic Liquid and of a Pure Lithium Iodide Melt
- Electrochemistry in Room Temperature Ionic Liquids: A Review and Some Possible Applications
- Electrochemical Deposition of Nanostructured Metals and Alloys from Ionic Liquids
- Coating of Mild Steel by Aluminium in the Ionic Liquid [EMIm]Tf2N and its Corrosion Performance
- Microviscosity and Micropolarity Effects of Imidazolium Based Ionic Liquids Investigated by Spin Probes Their Diffusion and Spin Exchange
- Semi-Empirical Methods to Predict the Physical Properties of Ionic Liquids: An Overview of Recent Developments
- Water Vibrational Bands as a Polarity Indicator in Ionic Liquids
- Probing Lithium and Alumina Impurities in Air- and Water Stable Ionic Liquids by Cyclic Voltammetry and In Situ Scanning Tunneling Microscopy
- The Static Dielectric Constant of Ionic Liquids
- A Comparative Study on the Electronic Structure of the 1-Ethyl-3-Methylimidazolium Bis(trifluoromethylsulfonyl)amide RT-Ionic Liquid by Electron Spectroscopy and First Principles Calculations
- Phase Separation in Solutions of Room Temperature Ionic Liquids in Hydrocarbons
- Surface Studies on the Ionic Liquid 1-Ethyl-3-Methylimidazolium Ethylsulfate Using X-Ray Photoelectron Spectroscopy (XPS)
- Templating and Phase Behaviour of the Long Chain Ionic Liquid C16mimCl
- Preparation of CdSe Quantum Dots in Ionic Liquids
- Electrochemistry at Negative Potentials in Bis(trifluoromethanesulfonyl)amide Ionic Liquids
- Enthalpies of Solution of Organic Solutes in the Ionic Liquids [Me3BuN][NTf2] and [EMIM][EtSO4]
- Electrodeposition of Metals for Micro- and Nanostructuring at Interfaces between Solid, Liquid and Gaseous Conductors: Dendrites, Whiskers and Nanoparticles
Articles in the same Issue
- Preface: 92nd Bunsenkolloquium – Physical Chemistry in Ionic Liquids
- Relaxation Dynamics upon Ultrashort UV Photo-Excitation of an Iodide Doped Ionic Liquid and of a Pure Lithium Iodide Melt
- Electrochemistry in Room Temperature Ionic Liquids: A Review and Some Possible Applications
- Electrochemical Deposition of Nanostructured Metals and Alloys from Ionic Liquids
- Coating of Mild Steel by Aluminium in the Ionic Liquid [EMIm]Tf2N and its Corrosion Performance
- Microviscosity and Micropolarity Effects of Imidazolium Based Ionic Liquids Investigated by Spin Probes Their Diffusion and Spin Exchange
- Semi-Empirical Methods to Predict the Physical Properties of Ionic Liquids: An Overview of Recent Developments
- Water Vibrational Bands as a Polarity Indicator in Ionic Liquids
- Probing Lithium and Alumina Impurities in Air- and Water Stable Ionic Liquids by Cyclic Voltammetry and In Situ Scanning Tunneling Microscopy
- The Static Dielectric Constant of Ionic Liquids
- A Comparative Study on the Electronic Structure of the 1-Ethyl-3-Methylimidazolium Bis(trifluoromethylsulfonyl)amide RT-Ionic Liquid by Electron Spectroscopy and First Principles Calculations
- Phase Separation in Solutions of Room Temperature Ionic Liquids in Hydrocarbons
- Surface Studies on the Ionic Liquid 1-Ethyl-3-Methylimidazolium Ethylsulfate Using X-Ray Photoelectron Spectroscopy (XPS)
- Templating and Phase Behaviour of the Long Chain Ionic Liquid C16mimCl
- Preparation of CdSe Quantum Dots in Ionic Liquids
- Electrochemistry at Negative Potentials in Bis(trifluoromethanesulfonyl)amide Ionic Liquids
- Enthalpies of Solution of Organic Solutes in the Ionic Liquids [Me3BuN][NTf2] and [EMIM][EtSO4]
- Electrodeposition of Metals for Micro- and Nanostructuring at Interfaces between Solid, Liquid and Gaseous Conductors: Dendrites, Whiskers and Nanoparticles
