To investigate the diversity of ligands in the curated dataset, we evaluated the distribution of coordinating atom counts from one-coordinate to six-coordinate as well as the most frequently occurring ligands. Bidentate (i.e., two-coordinate) ligands are the most well-represented in the curated dataset, accounting for 38% of the data (Figure ). This observation is to be expected, as bidentate ligands are widely used in TMC synthesis due to the high stability of the resulting complexes, which is attributable to the chelate effect and their low ring strain when compared to higher-denticity ligands. Ligands with only one (22%), three (19%), and four (15%) coordinating atoms are also well-represented in the dataset, while the rarely occurring ligands with six coordinating atoms (4%) are only slightly more represented than five-coordinate ligands (3%) (Figure ). The top five ligands that were the most represented before removing duplicates are all monodentate ligands: carbonyl, trimethylphosphine, tetrahydrofuran, nitrosyl, and methanol, all of which are well-known and widely used ligands or solvents in inorganic chemistry. The most common two-coordinate ligand is 1,2-dicyanoethene-1,2-dithiolate (Figure ). The most common four-coordinate ligand is the well-known tetraphenyl porphyrin, and other common ligands include three-coordinate 2,6-di(1H-pyrazol-3-yl)pyridine, five-coordinate N-benzyl-N,N',N'-tris(2pyridylmethyl)-1,2-diaminoethane, and six-coordinate p-cymene (Figure ). These ligands include various multidentate and haptic coordination modes with unique coordinating atoms, representing the diversity of the curated dataset.