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

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.

2021 ◽  
Vol 12 (14) ◽  
pp. 5016-5036
Author(s):  
Sharon E. Ashbrook ◽  
Zachary H. Davis ◽  
Russell E. Morris ◽  
Cameron M. Rice

Cost-effective and atom-efficient isotopic enrichment enables 17O NMR spectroscopy of microporous materials to be used to probe local structure and disorder and to explore chemical reactivity.


1979 ◽  
Vol 178 (1) ◽  
pp. 171-175 ◽  
Author(s):  
S. Aime ◽  
L. Milone ◽  
D. Osella ◽  
G.E. Hawkes ◽  
E.W. Randall

1980 ◽  
Vol 21 (40) ◽  
pp. 3837-3840 ◽  
Author(s):  
Herbert M. Schwartz ◽  
Malcolm MacCoss ◽  
Steven S. Danyluk

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