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

Shravan S. Acharya, Bjorn Winther-Jensen, Leone Spiccia, C. André Ohlin

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

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)×107s-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.

Original languageEnglish
Pages (from-to)751-754
Number of pages4
JournalAustralian Journal of Chemistry
Volume70
Issue number6
DOIs
Publication statusPublished - 2017

Cite this

Acharya, Shravan S. ; Winther-Jensen, Bjorn ; Spiccia, Leone ; Ohlin, C. André. / Rates of Water Exchange in 2,2′-Bipyridine and 1,10-Phenanthroline Complexes of CoII and MnII. In: Australian Journal of Chemistry. 2017 ; Vol. 70, No. 6. pp. 751-754.
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title = "Rates of Water Exchange in 2,2′-Bipyridine and 1,10-Phenanthroline Complexes of CoII and MnII",
abstract = "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)×107s-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.",
author = "Acharya, {Shravan S.} and Bjorn Winther-Jensen and Leone Spiccia and Ohlin, {C. Andr{\'e}}",
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Rates of Water Exchange in 2,2′-Bipyridine and 1,10-Phenanthroline Complexes of CoII and MnII. / Acharya, Shravan S.; Winther-Jensen, Bjorn; Spiccia, Leone; Ohlin, C. André.

In: Australian Journal of Chemistry, Vol. 70, No. 6, 2017, p. 751-754.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Rates of Water Exchange in 2,2′-Bipyridine and 1,10-Phenanthroline Complexes of CoII and MnII

AU - Acharya, Shravan S.

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AU - Ohlin, C. André

PY - 2017

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N2 - 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)×107s-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.

AB - 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)×107s-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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