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The reaction of Cu(SR) or [Cu(SR)][ClO4 ] derivatives (SR =p -nitrobenzenethiolate orO -ethylcysteinate) with potassium hydrotris(3,5-dimethyl-1-pyrazolyl)borate produces redox pairs of the stoichiometry CuI N3 (SR) and CuII N3 (SR). These complexes are well-defined synthetic approximations to the proposed N3 S binding sites of blue (type 1) copper electron transfer proteins. The compounds were investigated by a variety of chemical and spectral (optical, resonance Raman, and electron paramagnetic resonance) techniques; the complex K[Cu(hydrotris(3,5-dimethyl-1-pyrazolyl)borate)(p - NO2 C6 H4 S]-2 acetone was also studied by single-crystal x-ray diffraction methods. The spectrochemical characteristics of the CuII N3 (SR) species are in large part similar to the native system and thus provide some perspective regarding the origin of the unique type 1 spectral parameters and electron transfer properties.

proceedings of the national academy of sciences of the united states of america

Blue copper proteins: Synthesis, spectra, and structures of Cu I N 3 (SR) and Cu II N 3 (SR) active site analogues