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231223s2008 xx |||||o 00| ||eng c |
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|a 10.1002/mrc.2322
|2 doi
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|a pubmed24n0610.xml
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|a (DE-627)NLM183024818
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|a (NLM)18855345
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Maigut, Joachim
|e verfasserin
|4 aut
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|a The impact of tripodal chelates on water exchange kinetics and mechanisms
|b a variable temperature and pressure 17O NMR study to clarify the structure-reactivity relationship in [Fe(II)(L)(H2O2](-) complexes
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|c 2008
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 17.12.2008
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|a Date Revised 21.11.2013
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|a published: Print
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|a Citation Status MEDLINE
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|a The effect of temperature and pressure on the water exchange reaction of [Fe(II)(NTA)(H2O)2](-) and [Fe(II)(BADA)(H2O)2](-) (NTA = nitrilotriacetate; BADA = beta-alanindiacetate) was studied by 17O NMR spectroscopy. The [Fe(II)(NTA)(H2O)2](-) complex showed a water exchange rate constant, k(ex), of (3.1 +/- 0.4) x 10(6) s(-1) at 298.2 K and ambient pressure. The activation parameters DeltaH( not equal), DeltaS( not equal) and DeltaV( not equal) for the observed reaction are 43.4 +/- 2.6 kJ mol(-1), + 25 +/- 9 J K(-1) mol(-1) and + 13.2 +/- 0.6 cm(3) mol(-1), respectively. For [Fe(II)(BADA)(H2O)2](-), the water exchange reaction is faster than for the [Fe(II)(NTA)(H2O)2](-) complex with k(ex) = (7.4 +/- 0.4) x 10(6) s(-1) at 298.2 K and ambient pressure. The activation parameters DeltaH( not equal), DeltaS( not equal) and DeltaV( not equal) for the water exchange reaction are 40.3 +/- 2.5 kJ mol(-1), + 22 +/- 9 J K(-1) mol(-1) and + 13.3 +/- 0.8 cm(3) mol(-1), respectively. The effect of pressure on the exchange rate constant is large and very similar for both systems, and the numerical values for DeltaV( not equal) suggest in both cases a limiting dissociative (D) mechanism for the water exchange process
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Ferrous Compounds
|2 NLM
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|a Iron Chelating Agents
|2 NLM
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|a Oxygen Isotopes
|2 NLM
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|a Water
|2 NLM
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|a 059QF0KO0R
|2 NLM
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| 700 |
1 |
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|a Meier, Roland
|e verfasserin
|4 aut
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1 |
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|a Zahl, Achim
|e verfasserin
|4 aut
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| 700 |
1 |
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|a van Eldik, Rudi
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Magnetic resonance in chemistry : MRC
|d 1985
|g 46 Suppl 1(2008) vom: 15., Seite S94-9
|w (DE-627)NLM098179667
|x 1097-458X
|7 nnns
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| 773 |
1 |
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|g volume:46 Suppl 1
|g year:2008
|g day:15
|g pages:S94-9
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|u http://dx.doi.org/10.1002/mrc.2322
|3 Volltext
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|d 46 Suppl 1
|j 2008
|b 15
|h S94-9
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