作者:M. M. Britton、S. A. Fawthrop、D. G. Gillies、L. H. Sutcliffe、X. Wu、A. I. Smirnov
DOI:10.1002/(sici)1097-458x(199708)35:8<493::aid-omr121>3.0.co;2-i
日期:1997.8
For ESR studies of molecular rotation in liquids, it is desirable to match the spin probe as closely as possible to the solvent molecules. In this work the solvents were model lubricants whose overall motion has been characterized from carbon‐13 NMR relaxation measurements. Two compounds were studied, the approximately cylindrical mol‐ecule 5‐(n‐octyl)naphthalene (ON) (a model low‐traction fluid) and
对于液体中分子旋转的 ESR 研究,希望将自旋探针尽可能与溶剂分子匹配。在这项工作中,溶剂是模型润滑剂,其整体运动已从碳 13 NMR 弛豫测量中表征。研究了两种化合物,近似圆柱形分子 5-(正辛基)萘 (ON)(模型低牵引力流体)和近似球形分子二环己基-3,4-呋喃二甲酸酯(DCFDC)(模型高-牵引液)。对于这两种化合物,匹配的自旋探针 5-(n-octyl)-1,1,13,3-tetrakis(trideuteriomethyl)isoindolin-2-yloxyl (OTMIOD) 和 4,5-bis(cyclohexyloxycarbonyl)-1,3,分别制备了 2-二噻唑-2-基(BCCD)。ESR 测量是在 ON 和甲苯中在两个频率下对 OTMIOD 进行的,即 9 GHz(X 波段)和 94 GHz(W 波段),并且证明了进行高频测量对于评估各向异性参数的重要性。两种溶