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Mechanism of the Stepwise Dissociation of Fe^III^ Complexes with Tripodal Ligands as Siderophore Models by Guy Serratrice; Frédéric Biaso; Fabrice Thomas; Claude Béguin is a Chemistry article available to read on EtoBox.

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## Abstract The acid hydrolysis and formation kinetics of 1:1 ferric complexes with several tripodal hexadentate ligands were investigated over the [H^+^] range of 0.02−1.0 M at 25 °C and at an ionic strength of 2.0 M (NaClO~4~/HClO~4~). These ligands are based on a tris(2‐aminoethyl)amine (TREN) spacer connected through a tris(amide) moiety to identical pendant bidentate chelating group arms such as catecholate (TRENCAMS, **L**^**3**^), 8‐hydroxyquinolinate (O‐TRENSOX, **L**^**0**^) or pyridinophenolate (TRENPYPOLS, **L**^**5**^). Mixed ligands with chelating arms such as catecholate and 8‐hydroxyquinolinate (TRENSOX2CAMS, **L**^**1**^ and TRENSOXCAMS2, **L**^**2**^) were also investigated. An analogue of **L**^**0**^ (C‐SOX, **L**^**4**^) with a C‐pivot scaffold instead of TREN was studied for comparison. The acid hydrolysis reaction was found to proceed in four kinetically distinguishable stages. A common mechanism in the series was followed when the ligand structure was varied. The first stage is very fast and can be attributed to the dissociation of one arm of the tripodal ligand. The second and third stages involve protonation of the complex which induces a change of coordina

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Author

Guy Serratrice; Frédéric Biaso; Fabrice Thomas; Claude Béguin

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1434-1948)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)