The phenomenon of adsorption and desorption of xenon in an inorganic aluminium/zirconoxide fibre, in silica gel and in an organic polymer blend is compared by "'Xe ZD-exchange NMR experiments. A fast chemical exchange between adsorbed, liquid and free xenon gas occurs in the case of the alumina/zirc
On the use of 2D correlation and exchange NMR spectroscopy in organic porous materials
✍ Scribed by Petrik Galvosas; Ying Qiao; Monika Schönhoff; Paul T. Callaghan
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 207 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0730-725X
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✦ Synopsis
Two-dimensional (2D) nuclear magnetic resonance (NMR) methods for the investigation of correlation and exchange have been introduced in recent years and have been applied to a range of different systems. Here, we report on the use of 2D NMR diffusion-diffusion correlation spectroscopy for the investigation of diffusion anisotropy in cellular plant tissues and of diffusion-diffusion exchange spectroscopy for the study of the diffusive exchange of dextran in a dispersion of polyelectrolyte multilayer hollow capsules. Furthermore, diffusion-relaxation correlation spectroscopy was applied to both systems.
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## Abstract 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) ^1^H NMR exchange spectra are given. The rate constants are thus
The kinetics of the isotope exchange reactions of RCH(COOH) 2 (R"H, D, Me, Et, Bu, and Ph) in D 2 O solution were studied by using 1 H NMR spectroscopy. It was observed that the rate of isotope exchange reaction was inhibited by the presence of 1 M of DNO 3 , DCl, DBr or D 2 SO 4 and catalyzed by th