SYNTHESIS AND CRYSTAL STRUCTURE STUDIES OF Cu(I) COMPLEXES WITH PYRAZOLYBORATEO LIGANDS: AN APPROACH TO SYNTHETIC MODEL OF THE ACTIVE SITE OF BLUE COPPER PROTEINS SUCH AS PLASTOCYANIN

摘要

Because of the near similarity between pyrazole and the imidazol of the amino acid histidine , the polypyrazolyborate ligands are suitable for the synthesis as model compounds of several metaloproteins such as superoxid dismutase, hemerythrin and hemocynin. [Et_4 N]_2 [(Bp')CuMoS_4Cu_2(μ-Bp')_2 Cu_2MoS_4Cu(Bp')] (Fig.1) is the first complex containing both Bp'[ Bp'= H_2B(3,5-Me_2Pz)_2] and [MoS_4]~(-2) ligands offering a potential model of copper proteins . In this srructure the copper (I) atoms have two different geometries: 3-coordinated by two S of thiiomolybdate and one N of bridging Bp', and 4-coordinate by two S of thiiomoybdate and two N terminal Bp'.