1. Co6H8(P^iPr3)6: A Cobalt Octahedron with Face-Capping Hydrides
- Author
-
Ohki, Yasuhiro, Shimizu, Yuki, Araake, Ryoichi, Tada, Mizuki, Sameera, W.M.C, Ito, Jun-Ichi, and Nishiyama, Hisao
- Abstract
A square-planar Co4 amide cluster, Co4{N(SiMe3)2}4 (2), and an octahedral Co6 hydride cluster, Co6H8(PiPr3)6 (4), were obtained from metathesis-type amide to hydride exchange reactions of a CoII amide complex with pinacolborane (HBpin) in the absence/presence of PiPr3. The crystal structure of 4 revealed face-capping hydrides on each triangular [Co3] face, while the formal CoII2CoI4 oxidation state of 4 indicated a reduction of the cobalt centers during the assembly process. Cluster 4 catalyzes the hydrosilylation of 2-cyclohexen-1-one favoring the conjugate reduction. Generation of the catalytically reactive Co cluster species was indicated by a trapping experiment with a chiral chelating agent.
- Published
- 2016