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The X-Ray Structure of the Pyochelin Fe

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The X-Ray Structure of the Pyochelin Fe

3+

Complex

Karin Schlegel, Johann Lex, Kambiz Taraz, and Herbert Budzikiewicz

*,§

Institut für Organische Chemie, Universität zu Köln, Greinstr. 4, D-50939 Köln, Germany.

Fax: +49-2 21-4 70-50 57. E-mail: aco88@uni-koeln.de

* Author for correspondence and reprint requests

Z. Naturforsch.61 c, 263Ð266 (2006); received January 11, 2006

By X-ray structure analysis it could be shown that from the solution equilibrium of pyoche- lin I and II, differing in the stereochemistry at C-2⬙(1aand1b), crystals ofthe Fe3+complex ofthe steroisomer1aare formed with a 1:1 metal-to-ligand ratio. Ligand sites are the carbox- ylate and the phenolate anions and the two nitrogen atoms. Two equivalent ferri-pyochelin moieties are held together by a hydroxy and an acetate unit which satisfy the remaining two coordination sites ofFe3+.

Key words:Pyochelin, X-Ray Structure,Pseudomonas aeruginosa

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