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Verfasst von:Bosch, Simone [VerfasserIn]   i
 Comba, Peter [VerfasserIn]   i
 Gahan, Lawrence R. [VerfasserIn]   i
 Hanson, Graeme R. [VerfasserIn]   i
 Noble, Christopher [VerfasserIn]   i
 Schenk, Gerhard [VerfasserIn]   i
 Wadepohl, Hubert [VerfasserIn]   i
Titel:Selective coordination of Gallium(III), Zinc(II), and Copper(II) by an asymmetric dinucleating ligand
Titelzusatz:a model for metallophosphatases
Verf.angabe:Simone Bosch, Peter Comba, Lawrence R. Gahan, Graeme R. Hanson, Christopher Noble, Gerhard Schenk, and Hubert Wadepohl
E-Jahr:2015
Jahr:18 November 2015
Umfang:11 S.
Fussnoten:Gesehen am 27.05.2020
Titel Quelle:Enthalten in: Chemistry - a European journal
Ort Quelle:Weinheim : Wiley-VCH, 1995
Jahr Quelle:2015
Band/Heft Quelle:21(2015), 50, Seite 18269-18279
ISSN Quelle:1521-3765
Abstract:Abstract Complexation studies of the dinucleating ligand H3L (H3L=2-{[bis(pyridin-2-ylmethyl)amino]methyl}-6-{[bis(6-pivaloylamidopyridin-2-ylmethyl)amino]methyl}-4-methylphenol), with metal-binding sites?A and B, which both provide four donors to a metal ion; a tertiary amine; two pyridines (substituted with amide hydrogen-bond donors in site?B), and a bridging phenolate, with ZnII, CuII, and GaIII are reported. The titration of H3L with the three metal ions in solution was monitored by NMR spectroscopy or EPR and UV/Vis/near-IR spectroscopy, as well as by ESI-MS to analyze the selectivity of the two metal-ion sites?A and B of this model ligand for metallophosphatases; the spectroscopic assignments are supported by X-ray crystallography results. The first ZnII ion coordinates to site?A with unsubstituted pyridine donors and, upon addition of a second equivalent of ZnII, this coordinates to the sterically less accessible site?B. From a similar titration with GaIII, it emerges that only a mononuclear complex is obtained, with the GaIII center coordinated to site?A. When one equivalent of GaIII is reacted with the mononuclear ZnII complex, ZnII is forced by GaIII to exchange the site; this results in a dinuclear complex with GaIII in site?A and ZnII in site?B. With CuII, two isomers are observed: one with and the other without a bridging phenolate; these differ significantly in their spectroscopic and magnetic properties.
DOI:doi:10.1002/chem.201503348
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1002/chem.201503348
 Volltext: https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/chem.201503348
 DOI: https://doi.org/10.1002/chem.201503348
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:ligands
 metalloenzymes
 structure elucidation
 transition metals
 X-ray diffraction
K10plus-PPN:1698895631
Verknüpfungen:→ Zeitschrift

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