Numerous compounds adopt this geometry, examples being especially numerous for transition metal complexes. The noble gas compound xenon tetrafluoride adopts this structure as predicted by VSEPR theory. The geometry is prevalent for transition metal complexes with d configuration, which includes Rh(I), Ir(I), Pd(II), Pt(II), and Au(III). Notable examples include the anticancer drugs cisplatin, [PtCl(NH)], and carboplatin. Many homogeneous catalysts are square planar in their resting state, such as Wilkinsons catalyst and Crabtrees catalyst. Other examples include Vaskas complex and Zeises salt. Certain ligands (such as porphyrins) stabilize this geometry.