Direct evidence for the attack of a free N-heterocyclic carbene at a carbonyl ligand: a zwitterionic osmium carbonyl cluster.

@article{Liu2013DirectEF,
  title={Direct evidence for the attack of a free N-heterocyclic carbene at a carbonyl ligand: a zwitterionic osmium carbonyl cluster.},
  author={Yang Liu and Rakesh Ganguly and Han Vinh Huynh and Weng Kee Leong},
  journal={Angewandte Chemie},
  year={2013},
  volume={52 46},
  pages={12110-3}
}