Two diethyl phosphonated phosphine ligands of formula Ph2P (CH2) 3PO3Et2 (ligand L) and Ph2P (4-C6H4PO3Et2)(ligand L′) were used to prepare different complexes of platinum (II)(1, cis-PtCl2L2; 2, trans-PtCl2L2· H2O; 3A and 3B, cis-and trans-PtCl2L′ 2) and palladium (II)(4,[PdCl2L] 2; 5, trans-PdCl2L2· H2O; 6, trans-PdCl2L′ 2· CH2Cl2). The single-crystal X-ray structure analyses of complexes 1, 2, 4–6 indicate that complexation ...