title: Direct evidence for the attack of a free N-heterocyclic carbene at a carbonyl ligand: a zwitterionic osmium carbonyl cluster.
authors.affiliation: Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore).
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Rakesh
authors.initials: R
authors.lastname: Ganguly
authors.forename: Han Vinh
authors.initials: HV
authors.lastname: Huynh
authors.forename: Weng Kee
authors.initials: WK
authors.lastname: Leong
keywords: N-heterocyclic carbenes; carbonyl complexes; nucleophilic substitution; osmium clusters; zwitterions