What ligand is typically the most unreactive (i.e. poor sigma donor, poor pi donor, poor pi acceptor, non sterically bulky, spectator, etc.) for metal complexes
I have a computational calculation involve a tetrahedral complex and I want to just change one ligand while keeping the other 3 constant. But which ligand is the closest I can get that basically act like a test object and thus its presence does not perturb the energetics of the complex significantly (e.g. not more than 50 kcalmol-1)?