1) 2D-EXSY NMR 二维核磁共振交换谱1. The isomer conversion of formanilide was investigated by ~(13)C 2D-EXSY NMR,and the conversion rate was obtained by approximation method proposed by ourselves~([5]). 自Ernst1979年创立的二维核磁共振交换谱(2D-EXSY)以来,人们可以仅从一张谱获得复杂体系的...
Solute translocation by membrane transport proteins is a vital biological process that can be tracked, on the sub-second timescale, using nuclear magnetic resonance (NMR). Fluorinated substrate analogues facilitate such studies because of high sensitivity of 19FNMR and absence of background signals. ...
2D-EXSY NMR methods were used to explore diffusion between different domains in zeolites on two very different length scales. Measurements were made on xenon-containing samples consisting of a mixture of NaX and NaY zeolite particles which give distinct resonance lines. The cross peaks observed were...
The halogen exchange reactions at equilibrium of (Z)-1-[2-(bromochlorophenylstannyl)vinyl]-1-cyclohexanol were studied by two-dimensional 119Sn exchange NMR spectroscopy (2D 119Sn EXSY NMR). A single halogen exchange mechanism was found from a quantitative matrix analysis of the data....
A procedure for the estimation of the mixing time between the last two 90° pulses in the classic three-pulse sequence NOESY/EXSY is proposed and tested and some considerations for the treatment of the two-dimensional (2D) 1H NMR exchange spectra are given. The rate constants are thus obtaine...
This chapter describes some new applications of 129 Xe NMR spectroscopy that use the dynamic properties of adsorbed xenon to learn about structure of pores, xenon exchange and diffusion. Exchange rates, obtained with 2D EXSY NMR techniques, are measured for diffusion paths with widely varying length...
Application of129xe 2d-EXSY NMR to intra- and interparticle exchange in zeolites. Applied Magnetic Resonance, 8(3): 385-399, 1995. doi:10.1007/BF03162653. 20, 24Moudrakovski I.L., Ratcliffe C.I., Ripmeester J., Application of 129Xe 2D- EXSY NMR to intra- and interparticle exchange in...
NMR2D EXSY NMRconformationN‐alkenylamidesE/Z rotation barriersThe rotational barriers of some N-alkenylamides were measured by 2D exchange spectroscopy (2D EXSY) NMR techniques. It was found that the conjugated double bond lowers E,Z barriers by 2.6 kJ mol−1. Copyright © 2003 John Wiley...
2D EXSY NMRComplete line‐shape analysisAroylcyanoketene‐S,S‐dimethylacetalsThe applicability of 2D EXSY NMR spectroscopy for studying quantitatively the dynamic behaviour in three aroylcyanoketene- S , S -dimethylacetals was tested by means of 1 H NMR spectroscopy. It can be concluded that ...
Solid-state NMRLithium sulfateLi2SO4 ⋅H2O6 Li EXSYDiffusion of lithium ions in solids is an interesting topic for fundamental research as well as applied science. Fast moving Li ions are desirable for several energy storage applications, whereas materials with slow diffusing Li ions find use, ...