Some molecular compounds that adopt square pyramidal geometry are XeOF, and various halogen pentafluorides (XF, where X = Cl, Br, I). Complexes of vanadium(IV), such as vanadyl acetylacetonate, [VO(acac)], are square pyramidal (acac = acetylacetonate, the deprotonated anion of acetylacetone (2,4-pentanedione)).