Abstract
A new imidazolate bridged Cu 2+, Zn 2+ binuclear complex [(dtma) CuImZn (dtma)]ClO 4· 2.5H 2O taken as an active site model for Cu,Zn-SOD has been synthesized and its crystal structure has been determined. All the bond lengths, bond angles and the distance between copper and zinc atoms in the CuImZn core of the model complex are close to those in Cu,Zn-SOD. ESR parameters of the model complex as a function of pH show that the imidazolate bridge is stable in the pH range 10–12, and is broken on the zinc side at pH ∼ 9. With decreasing pH, the imidazole is released at pH ∼ 4 and the dtma ligand dissociates from the copper-containing fragment at pH ∼ 2.4.
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