The synthesis of the first undeca-osmium cluster species, [PPh3Me]2[Os11C(CO)27], and the X-ray structure analysis of its [Cu(NCMe)]+ derivative [PPh3Me][Os11C(CO)27Cu(NCMe)]·CH2Cl2

Abstract

The first undeca-osmium cluster, [Os₁₁C(Co)₂₇]^2–(1), has been isolated as a low-yield product of the vacuum pyrolysis of Os₃(CO)₁₂, the dianion (1) reacts with 1 equivalent of [Cu(NCMe)₄][BF₄] to give the monoanion [Os₁₁C(CO)₂₇Cu(NCMe)]^–(2) which has been shown by X-ray analysis to have an unusual Os₁₁core geometry with the carbido atom occupying a trigonal prismatic cavity.