The heavy analogue of ferrocene (eta(5)-Me5C5)Fe[eta(5)-(CPh)(CH)Si2Ge((SiMeBu2)-Bu-t)(3)] 2, incorporating three heavy group 14 elements in one of the cyclopentadienyl rings, was synthesized by the reaction of the heavy lithium cyclopentadienide [eta(5)-(CPh)(CH)Si2Ge((SiMeBu2)-Bu-t)(3)]center dot[Li+(thf)] 1(-)center dot[Li+(thf)] with (eta(5)-Me5C5)Fe(acac) in THF. The crystal structure analysis of 2 revealed a remarkable flattening of the C2Si2Ge five-membered ring, taking place upon complexation, in which the lengths of all skeletal bonds were intermediate between those of the typical single and double bonds. The one-electron oxidation of 2 occurred at more negative potentials than that of the parent (eta(5)-Me5C5)(2)Fe: -0.53 versus -0.32 V. The fragment MO and energy decomposition analyses revealed that the bonding in 2 is predominantly electrostatic, whereas the most important covalent bonding contribution comes from the heavy Cp- ligand to CpFe+ fragment pi-donation.