N-heterocyclic carbene complexes of Rh: reaction with dioxygen without oxidation. Praetorius, J., M., Allen, D., P., Wang, R., Webb, J., D., Grein, F., Kennepohl, P., & Crudden, C., M. J. Am. Chem. Soc., 130(12):3724-5, 3, 2008.
N-heterocyclic carbene complexes of Rh: reaction with dioxygen without oxidation. [pdf]Paper  N-heterocyclic carbene complexes of Rh: reaction with dioxygen without oxidation. [link]Website  doi  abstract   bibtex   1 download  
The reaction of oxygen with rhodium complexes containing N-heterocyclic carbenes was found to give dioxygen complexes with rare square planar geometries and unusually short O-O bond lengths. Analysis of the bonding in these complexes by Rh L-edge X-ray absorption spectroscopy (XAS), Raman spectroscopy, and DFT calculations provides evidence for a bonding model in which singlet oxygen is bound to a Rh(I) d8 metal complex, rather than the more common Rh(III) d6 peroxo species with octahedral geometry and O-O bond lengths in the 1.4-1.5 A range.

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