The stepwise formation constants for the chloride complexes of palladium(II) have been determined from spectrophotometric measurements made at 21, 29.5 and 38°. The reaction between palladium(II) chloride and acetylacetone in aqueous solution has also been investigated, but from pH measurements at 20, 30 and 40°. The logarithm of the over-all formation constant for PdCU-2, estimated to be 15.8 at 25°, is observed to be of the same order of magnitude as that for PtCU-2 and HgCl,-2. The thermodynamic stability of bis-(acetylacetonato)-palladium(II) is greater than would be anticipated from considerations of the electronegativity and the second ionization potential of palladium.

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