Reaction between µ4-Si[CO2(CO)7]2 and [Co(CO)4]– gave the paramagnetic title anion which was isolated as the mixed salt [NEt4]3[µ8-SiCo9(CO)21][Co(CO)4]; an X-ray structure determination showed the cluster anion to consist of a capped square anti-prismatic array of cobalt atoms encapsulating the silicon atom.
K. M. Mackay, B. K. Nicholson, W. T. Robinson and A. W. Sims, J. Chem. Soc., Chem. Commun., 1984, 1276 DOI: 10.1039/C39840001276
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