Metal carbonyls dimanganese decacarbonyl

Nitroarenes are reduced to anilines (>85%) under the influence of metal carbonyl complexes. In a two-phase system, the complex hydridoiron complex [HFe,(CO)u]2-is produced from tri-iron dodecacarbonyl at the interface between the organic phase and the basic aqueous phase [7], The generation of the active hydridoiron complex is catalysed by a range of quaternary ammonium salts and an analogous hydrido-manganese complex is obtained from dimanganese decacarbonyl under similar conditions [8], Virtually no reduction occurs in the absence of the quaternary ammonium salt, and the reduction is also suppressed by the presence of carbon monoxide [9], In contrast, dicobalt octacarbonyl reacts with quaternary ammonium fluorides to form complexes which do not reduce nitroarenes. 

Another inorganic particle that has been prepared via RESS is iron oxide (Fe203) (75). The preparation involved rapid expansion of a Fe(N03)3 solution in supercritical water. The expansion was at 500°C and 100 MPa through 50-to 200-p,m-diameter orifices into an evacuated chamber. The Fe203 particles thus obtained were small and exhibited exceptional reactivities. In addition to inorganic oxides, several neutral metal carbonyls (chromium hexacarbonyl, dimanganese decacarbonyl, and triiron dodecacarbonyl) were processed via RESS to form micrometer-sized particles (76). The solubility of these compounds allowed the use of supercritical CO2 in the RESS processing. 

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