Structure of palladium(I) carbonylcarboxylate clusters [Pd2(CO)2(RCOO)2]n in solution: NMR and IR study

The structures of palladium carbonylcarboxylate clusters [Pd2(CO)2(RCOO)2]n (n = 2, R = CH3, CH2Cl, CF3, n = 3, R = CMe3, CHMe2, n-C5H11) are studied in benzene and tetrahydrofuran solutions by IR and 1H and 13C NMR spectroscopy. The clusters in the solid state have a planar cyclic metal framework with pairs of the carbonyl and carboxylate ligands alternately coordinated on its sides. In solutions, compounds under consideration contain one-type carbonyl ligands and one-type carboxylate ligands; their structures are similar to thaso in the solid state.