experiments we report here, we have measured spectral changes associated with both the disulfide radical anion and the a subunit heme group. Moreover, since we have found that C02*~r educes the heme group in Fe(III)-a-Hb with no attached disulfide and predominantly the disulfide of Fe(III)-a-Hb-SSR, unwanted side reactions due to "contaminating" radical reduction at other protein sites most presumably do not occur in this system.

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Keywords: Cyanides / Copper / Zinc / Thermochemistry / EXAFS spectroscopy Copper-zinc nanocomposites were prepared by thermolysis of copper-zinc cyanides under mild conditions. Two different routes were used for the preparation of the cyanide complex: A batch precipitation method and the continuous overflow precipitation method. The thermolysis of the cyanides was studied in-situ by thermogravimetry coupled with infrared spectroscopy (TG-IR) and by thermogravimetry coupled with mass spectroscopy (TG-MS). The structure of the nanocomposites was investigated by X-ray powder diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). Geometric models were suggested on the atomic scale based on EXAFS results for the precursor, the mixed oxides (CuO/

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