Biological activity and coordination modes of copper(II) complexes of Schiff base-derived coumarin ligands.

Summary of "Biological activity and coordination modes of copper(II) complexes of Schiff base-derived coumarin ligands."

The coordination modes of copper(II) complexes of Schiff base-derived coumarin ligands, which had previously shown good anti-Candida activity, were investigated by pH-potentiometric and UV-Vis spectroscopic methods. These studies confirmed the coordination mode of the ligands to be through the N of the imine and deprotonated phenol of the coumarin-derived ligand in solution. In addition, the more active complexes and their corresponding ligands were investigated in the presence of copper(II) in liquid and frozen solution by ESR spectroscopic methods. A series of secondary amine derivatives of the Schiff base ligands, were isolated with good solubility characteristics but showed little anti-Candida activity. However, cytotoxicity studies of the secondary amines, together with the copper complexes and their corresponding ligands, against human colon cancer and human breast cancer cells identified the chemotherapeutic potential of these new ligands.


Department of Science, Institute of Technology Tallaght, Dublin 24, Ireland.

Journal Details

This article was published in the following journal.

Name: Dalton transactions (Cambridge, England : 2003)
ISSN: 1477-9234
Pages: 10854-65


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Neutral or negatively charged ligands bonded to metal cations or neutral atoms. The number of ligand atoms to which the metal center is directly bonded is the metal cation's coordination number, and this number is always greater than the regular valence or oxidation number of the metal. A coordination complex can be negative, neutral, or positively charged.

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