Rates and Mechanism of Fluoride and Water Exchange in UO2F53-and [UO2F4(H2O)]2-Studied by NMR Spectroscopy and Wave Function Based Methods

2002 ◽  
Vol 41 (21) ◽  
pp. 5626-5633 ◽  
Author(s):  
Valérie Vallet ◽  
Ulf Wahlgren ◽  
Zoltán Szabó ◽  
Ingmar Grenthe
Keyword(s):  
Wave Function ◽  
Nmr Spectroscopy ◽  
Water Exchange

Long-Distance Water Exchange within Dense Clay Sediments Probed by Two-Time 2H Stimulated Echo NMR Spectroscopy

2013 ◽  
Vol 117 (19) ◽  
pp. 9920-9931 ◽  
Author(s):  
Patrice Porion ◽  
Anne Marie Faugère ◽  
Alfred Delville
Keyword(s):  
Nmr Spectroscopy ◽  
Water Exchange ◽  
Long Distance ◽  
Stimulated Echo

Rates of Water Exchange in 2,2′-Bipyridine and 1,10-Phenanthroline Complexes of CoII and MnII

2017 ◽  
Vol 70 (6) ◽  
pp. 751 ◽  
Author(s):  
Shravan S. Acharya ◽  
Bjorn Winther-Jensen ◽  
Leone Spiccia ◽  
C. André Ohlin
Keyword(s):  
Nmr Spectroscopy ◽  
Water Exchange ◽  
Variable Temperature ◽  
Activation Parameters ◽  
Cobalt Complexes ◽  
Degree Of Substitution ◽  
Manganese Complexes ◽  
17O Nmr ◽  
17O Nmr Spectroscopy

The rates and activation parameters of water exchange at pH 3.0 have been determined using variable temperature 17O NMR spectroscopy for four CoII complexes and one MnII complex: [Co(bpy)(H2O)4]2+, [Co(bpy)2 (H2O)2]2+, [Co(phen)-(H2O)4]2+, [Co(phen)2 (H2O)2]2+, and [Mn(bpy)(H2O)4]2+ (bpy = 2,2′-bipyridyl and phen = 1,10-phenanthroline). Substitution of aquo ligands with 1,10-phenanthroline or 2,2′-bipyridyl leads to an increase in the rate of exchange in the manganese complexes, from k298 (1.8 ± 0.1) × 107 s−1 for [Mn(H2O)6]2+ to (7.2 ± 0.3) × 107 s−1 for [Mn(phen)2 (H2O)2]2+, whereas the trends are more complex for the cobalt complexes. We have used the new data in conjunction with literature data for similar complexes to analyse the effect of M–OH2 distance and degree of substitution.

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