Abstract
A stable monomeric Pt(III) complex is obtained resulting from PtCl 4 2- - bilirubin interaction in basic-aqueous medium. By means of EPR method it is proven that in the course of the interaction a redox process proceeds, giving rise to a stable Pt(III) complex species and a free radical. On the basis of all spectroscopic (EPR, 195 Pt-NMR, IR, UV-Vis) and magnetochemical data obtained a square-pyramidal (e.g. distorted octahedral) structure is suggested. Most likely a biliverdin molecule (oxidation product of bilirubin) is placed in the xy plane, coordinated via the four pyrrole nitrogens of the ligand and the 5th site being occupied by a water molecule.
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