Zur Reaktion von Natriumtetracarbonylcobaltat mit Aluminiumtrichlorid. Molekiilstruktur von Co4(CO)13Al(THF)3Co3(CO)10 / On the Reaction of Sodium Tetracarbonylcobaltate with Aluminiumtrichlorid. Molecular Structure of Co4(CO)13Al(THF)3Co3(CO)10

Abstract

The reaction of NaCo(CO)4 with AlCl3 in benzene has been studied. Main product of the reaction is Co4(CO)12. However, fractional crystallization of the crude reaction mixture gives small amounts of black crystals of the cobalt cluster Co4(CO)13Al(THF)3Co3(CO)10 A single crystal structure determination has revealed a quasi-octahedrally coordinated Al atom which is bridging a Co3(CO)9-oxymethylidin-tricobalt-nonacarbonyl cluster unit and a Co4-carbonyl cluster unit. Three THF ligands are completing the octahedral environment of the group-III metal. The aluminium atom is bonded to the oxygen atoms of three μ3-bridging CO groups of the Co3- and Co4-cluster fragments.