Correction to: Nature Chemistry https://doi.org/10.1038/nchem.2886, published online 20 November 2017.

In the version of this article initially published, a second supplementary file containing the structural models and the VASP POSCAR files of all optimized structures used in the study was not available. Due to the age of the article, the files cannot be updated directly. The dataset is now available as Supplementary Information accompanying this amendment.