Four types of square Pt-4 complexes bearing two or more ferrocenecarboxylate ligands-[Pt-4(mu-OCOCH3)(4)(mu-OCO-C5H4FeCp)(4)] (6); [Pt-4(mu-OCOCH3)(4)(mu-OCOC5H4FeCp)(3)(mu-ArNCHNAr)], where ArNCHNAr = N,N'-diarylformamidinate) (7); trans-[Pt-4(mu-OCOCH3)(4)(mu-OCOC5H4FeCp)(2)(mu-ArNCHNAr)(2)] (8); and cis- [Pt-4(mu-OCOCH3)(4)(mu-OCOC5H4FeCp)(2)(kappa(4)-N-4-DArBp)(2)], where DArBp = 1,3-bis(benzamidinato)propane (9) were successfully prepared via reactions of [FeCp(eta(5)-C5H4COOH)] (5) with the corresponding square Pt4 complexes, which have labile in-plane acetate ligands. The newly prepared Pt4 complexes (6-9) with ferrocene moieties as pendants were characterized by nuclear magnetic resonance (NMR) spectroscopy, mass spectroscopy (MS), combustion analyses, and single-crystal X-ray analysis for 6, some of the trans-Pt4Fe2 8, and the cis-Pt4Fe2 complexes 9. Weak interactions between two ferrocene moieties across the Pt-4 core, providing Delta E-1/2 values and K-c constants, were revealed electrochemically, using cyclic and differential-pulse voltammetry in dichloromethane containing [(Bu4N)-Bu-n][BAr4F] (where Ar-F = H-6(3)(CF3)(2)-3,5), which was a better supporting electrolyte for such an interaction than [(Bu4N)-Bu-n][PF6].