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Formation and Stabilization of Monomeric Pt(Iii) Species Through Complexation With Linear Tetrapyrrole Ligand Bilirubin

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A stable monomeric Pt(III) complex is obtained resulting from PtCl42- - 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, 195Pt-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.

Affiliations: 1: department of Chemistry, University of Sofia, 1, J. Bourchier av., 1126 Sofia, Bulgaria; 2: Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; 3: Faculty of Pharmacy, Medical Academy, Banacha 1, 02097 Warsaw, Poland


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