Yet Another Structure Can we draw Fe(Cp)4(CO)4? -By symmetry,each Fe Cp gets a Cyclo-pentadienyl (Cp)and a CO 'Fe: -Cp donates 5 e,so now we have 15 e for each Fe Co Fe Cp If we put the Fe's at the Cp corners of a tetrahedron, :Fe. cO then each Fe can share a single bond with three CO Cp other Fe's;we end up with 18e per Fe. XIV-15Fe Yet Another Structure • Can we draw Fe4(Cp)4(CO)4? — By symmetry, each Fe gets a Cyclo-pentadienyl (Cp) and a CO — Cp donates 5 e- , so now we have 15 e- for each Fe — If we put the Feʼs at the corners of a tetrahedron, then each Fe can share a single bond with three other Feʼs; we end up with 18 e- per Fe. Fe Fe Fe CO Cp CO CO Cp Cp Cp CO XIV-15