Molecular Dynamics of Transient Radicals in Solution Probed by Longitudinal-Field Muon Spin Relaxation

[摘要] Longitudinal field muon spin relaxation (LF-μSR) has been used to measure the magnetic field dependence of the longitudinal field muon spin relaxation rates (λμ 1/Tμ1) of two muoniated radicals, 2-muoxyprop-2-yl radical (formed by Mu addition to acetone) and the muoniated 1,2-dicarboxyvinyl radical dianion (formed by Mu addition to the 1,2- dicarboxyacetylene dianion), in aqueous solution. The rotational correlations time of the radicals in solution at 298 K were determined from the magnetic field dependence of λμ and were found to be 32±2 ps for the 2-muoxyprop-2-yl radical and 55±3 ps for the muoniated 1,2-dicarboxyvinyl radical dianion.

[发布机构] Centre for Molecular and Materials Science, TRIUMF, Vancouver; BC; V6T 2A3, Canada^1;Department of Chemistry, Simon Fraser University, Burnaby; BC; V5A 1S6, Canada^2;ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon; OX11 0QX, United Kingdom^3

[关键词] Dianions;Longitudinal fields;Magnetic field dependences;Muon spin relaxation;Rotational correlation;Transient radicals