A NEW ASYMMETRIC N5O2-DONOR BINUCLEATING LIGAND AND ITS FIRST FE(II)FE(III) COMPLEX AS A MODEL FOR THE REDOX PROPERTIES OF UTEROFERRIN

A new N,O-donor binucleating ligand, 2-bis[{(2-pyridylmethyl)-aminomethyl)-6-{(2-hydroxybenzyl)(2-pyridylmethyl)}-aminomethyl]-4-methylphenol (H(2)BPBPMP), and its first binuclear (FeFeIII)-Fe-II complex have been prepared in order to provide synthetic analogues for the coordination environment on the active site of purple acid phosphatases. The complex [(FeFeIII)-Fe-II(BPBPMP) (OAc)(2)]ClO4 . CH3OH was obtained from a self-assembled type reaction between Fe(ClO4)(2) . 6H(2)O, H(2)BPBPMP and sodium acetate trihydrate in methanol. The complex has been characterized by IR, CHN, molar conductivity, magnetic susceptibility, Mossbauer, electronic absorption spectroscopies and electrochemical methods of analyses, and turns out to be the first synthetic analogue for the redox properties (E(o)' = 0.38 V versus NHE) of uteroferrin.