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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
Published on: August 19, 2013
Reversible Carboxylate Shift in a μ-Oxo Diferric Complex in Solution by Acid-/Base-Addition
Thomas Philipp Zimmermann1, Thomas Limpke1, Anja Stammler1
1Lehrstuhl für Anorganische Chemie I, Fakultät für Chemie , Universität Bielefeld , Universitätsstrasse 25 , D-33615 Bielefeld , Germany.
Abstract:
A reversible carboxylate shift has been observed in a μ-oxo diferric complex in solution by UV-vis-NIR and FTIR spectroscopy triggered by the addition of a base or an acid. A terminal acetate decoordinates upon the addition of a proton, resulting in a shift of the remaining terminal acetato to a μ-η1:η1 bridge. The addition of a base restores the original structure containing only terminal acetates. The implications for metalloenzymes with carboxylate-bridged nonheme diiron active sites are discussed.
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