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

页码：906 / 911

页数：6

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