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The resulting solid was dissolved in a minimum amount of dichloromethane (~ 5 mL) and loaded onto a packed silica plug (80 g). The silica plug was dried under a stream of air, and then the plug was washed with diethyl ether (~ 5 mL). Dichloromethane was used to elute the first dark brown band, containing pure [Co6Se8(CO)(PEt3)5][PF6].

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