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Quantitative 2D EXSY and Dynamic 19F-NMR Studies of the Dynamic Behaviour of the Bidentate Chelate Complex Ga(fox)3 (fox = 5-fluoro-8-hydroxyquinoline)

✍ Scribed by Marina Gromova; Olivier Jarjayes; Sylvain Hamman; Robert Nardin; Claude Béguin; Rudolph Willem

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 350 KB
Volume: 2000
Category: Article
ISSN: 1434-1948
DOI: 10.1002/(sici)1099-0682(200003)2000:3<545::aid-ejic545>3.0.co;2-2

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✦ Synopsis

F NMR / EXSY / Kinetics of ligand exchange / Bailar and Ra ˆy-Dutt mechanisms

The rates of intramolecular rearrangement of the meridional isomer of the metal tris-chelate complex [Ga(fox) 3 , fox = 5fluoro-8-hydroxyquinoline] in DMF solution were measured using 1D NMR line shape analysis and 2D EXSY spectra. The rates of exchange k ab , k bc and k ac between the three nonequivalent ligands a, b and c were determined. The values of the activation parameters were obtained. ∆H was 70.

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