For 10 points, name this molecular geometry which is flat with four sides.
The central carbon atom of fenestranes has this molecular geometry, and reactions of substituents of complexes with this geometry are greatly accelerated when the trans ligand is a good pi acceptor. In crystal field theory, the d-orbitals of these complexes are split into four levels, giving it larger stabilization energy than the octahedral configuration. This geometry is occupied by low-spin d-8 complexes like Vaska's complex, the chemotherapy drug cisplatin, and a hydrogenation catalyst with a central rhodium atom and a series of triphenylphosphine ligands named for Wilkinson. According to VESPR, xenon tetraflouride occupies this configuration since it has 2 lone pairs and 4 ligands. For 10 points, name this molecular geometry which is flat with four sides.
The central carbon atom of fenestranes has this molecular geometry, and reactions of substituents of complexes with this geometry are greatly accelerated when the trans ligand is a good pi acceptor.
{Square planar}