Excited state properties of the siderophore pyochelin and its complex with zinc ions

Sholeh Namiranian, David J. Richardson, David A. Russell, John R. Sodeau

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The critical effects of pH on the electronic absorption and fluorescence characteristics of the siderophore, pyochelin, are investigated. A single anionic species is shown to be sufficient to explain the data obtained under alkaline conditions. In acidic solutions, several competing ground- and excited-state equilibria are present, which lead to fluorescence emissions from both the protonated form of pyochelin and its phenolate ion. From the spectroscopic data we are also able to show that pyochelin interacts with zinc ions in the ground state via its anionic form, thereby confirming that this siderophore does not bind Fe(III) ions uniquely.

Original languageEnglish
Pages (from-to)777-782
Number of pages6
JournalPhotochemistry and Photobiology
Issue number5
Publication statusPublished - May 1997

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