SYNTHESIS AND KINETIC-STUDY OF PALLADIUM AND PLATINUM COMPLEXES WITH AMINOPOLYCARBOXYLATE LIGANDS

A general synthetic procedure for the preparation of Pd(II) and Pt(II) complexes with aminopolycarboxylate ligands is reported. These compou nds are easily prepared from acetic acid solutions of MCl2 and H-4L (M = Pd or Pt; L = EDTA, PDTA or CDTA). Two different kinds of compounds can be isolated, [M (H4L) Cl2] and (H-6L) [MCl4]. In the case of plat inum compounds, both structures can be easily distinguished using elec tronic spectroscopy. Complexes [M (H-2L)] have also been isolated from aqueous solutions of the chloro compounds. Salts (H-6L) [MCl4] in aqu eous solution are slowly converted into the corresponding complexes wi th coordinated L. The kinetics of this process have been studied in th e case of the platinum compounds.