The transverse relaxation rate of H 2 0 in AI(H20)F has been measured as a function of temperature (255 to 417 K) and pressure (up to 220 MPa) using the I70-NMR line-broadening technique, in the presence of Mn(I1) as a relaxation agent. At high temperatures the relaxation rate is governed by chemica
Water Exchange on Hexaaquavanadium(III): a Variable-Temperature and Variable-Pressure 17O-NMR Study at 1.4 and 4.7 Tesla
✍ Scribed by Alain D. Hugi; Lothar Helm; André E. Merbach
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- German
- Weight
- 754 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Part 24 of the series 'High-pressure NMR Kinetics'. Part 23: [I]. These results are part of the Ph. D. thesis of A .
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Fast water exchange rate constants on diamagnetic metal ions can be measured using either a paramagnetic chemical shift agent or a paramagnetic relaxation agent. An approximate analytical equation was developed for the chemical shift agent method, valid in the limit of rapid exchange. The limits of
## Abstract Rate constants and activation parameters for water exchange on hexaaqua‐ and monohydroxypentaaquarhodium(III) were determined by ^17^O NMR as a function of temperature (323–364 K) and pressure (up to 210 MPa, at 323 K) at several acidities (1.0–5.0 molal HClO~4~). The observed rate cons
Water exchange of square-planar Pd(H,O):' has been studied as a function of temperature (240 to 345 K) and pressure (0.1 to 260 MPa, at 324 K) by measuring the I70-FT-NMR line-widths of the resonance from coordinated water at 27.11 and 48.78 MHz. The following exchange parameters were obtained: k:&8
## Abstract ^17^O NMR longitudinal and tranverse relaxation rates and chemical shifts were measured at variable temperature at three magnetic fields (1.4, 4.7 and 9.4 T) for aqueous solutions of the complexes [Gd(H~2~O)~8~]^3+^ and [Gd(PDTA)(H~2~O)~2~]^−^. The transverse relaxation rates and chemic