A large fraction of the compounds studied for catalysis contain the ligands we previously categorized as labile (243 out of 698, 35%, Supporting Information Table and a list of refcodes is provided in the Zenodo repository). For the set of octahedral compounds that have not been used for catalysis, we found that a significant fraction (366 out of 1,810, 20%) also contain these labile ligands (Supporting Information Table ). From the 191 unique tetradentate ligands that appear in octahedral complexes in combination with labile ligands, 79 (41%) also appear in square planar geometries, indicating that they have been isolated in other geometries and are correspondingly potentially suitable for catalysis. Of these, 50 have downloadable associated manuscripts, and we identified 48 that were not used for catalysis applications in their corresponding CSD depositions.