CO in tetrahydrofuran dissolving of the cluster in THF, degassing (three freeze-pump-thaw cycles), placing under 1 atm of CO (room temp., 1 d); evapn. of solvent, chromy. (silica gel, hexane);

CO in tetrahydrofuran dissolving of the cluster in THF, degassing (three freeze-pump-thaw cycles), placing under 1 atm of CO (room temp., 1 d); evapn. of solvent, chromy. (silica gel, hexane);