Nature Chemistry 6, 409–414 (2014); published online 23 March 2014; corrected after print 21 May 2014.10.1038/nchem.1891

In the version of this Article originally published, ref. 40 was incorrect, it should have read: Rodríguez-Castillo, M. et al. Reactivity of gold nanoparticles towards N-heterocyclic carbenes. Dalton Trans. 43, 5978–5982 (2014). This has been corrected in the online versions of the Article.