High-Pressure ESR Spectroscopy: On the Rotational Motion of Spin Probes in Pressurized Ionic Liquids

被引：0
|
作者：
Kattnig, Boryana Y. Mladenova [1 ]
Kattnig, Daniel R. [1 ]
Grampp, Guenter [2 ]
机构：
[1] Univ Exeter, Living Syst Inst, Exeter EX4 4QD, Devon, England
[2] Graz Univ Technol, Inst Phys & Theoret Chem, A-8010 Graz, Austria
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2022年 / 126卷 / 04期
基金：
奥地利科学基金会;
关键词：
TIME-RESOLVED EPR; STOKES-EINSTEIN; MOLECULAR-DYNAMICS; TEMPERATURE; DIFFUSION; DEPENDENCE; RESONANCE; VISCOSITY; SOLVENTS; MOBILITY;
D O I：
10.1021/acs.jpcb.1c09243
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report high-pressure (up to 50 MPa) ESR-spectroscopic investigations on the rotational correlation times of the nitroxide radicals 2,2,6,6-tetramethylpiperidine 1- oxyl (TEM-PO), 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (TEM-POL), and 4-amino-2,2,6,6-tetramethylpiperidine 1-oxyl (ATEM-PO) in the ionic liquids 1-ethyl-3-methylimidazolium tetrafluoroborate (emimBF(4)), 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF(6)), 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4)), 1-methyl-3- octylimidazolium tetrafluoroborate (omimBF(4)), and 1-methyl-3-octylimidazolium hexafluorophosphate (omimPF(6)). The activation volumes (38.5-56.6 angstrom(3)) determined from pressure dependent rotational diffusion coefficients agree well with the pressure dependent viscosities of the ionic liquids. Experimentally, the fractional exponent of the generalized Stokes-Einstein-Debye relation is found to be close to one.
引用
收藏
页码：906 / 911
页数：6
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