Pentanedionato l- platinum II

The excess silver ion is then removed electrochemically at a cylindrical platinum net electrode (1.37 0.01 V)4 in an apparatus such as presented in Fig. 1. In a typical run, the electrolysis requires 110-120 hours. During this time, the current initially is 6-8 mA, rises to —9-12 mA after 60 hours, and drops to 3-5 mA after 110 hours. The resulting yellow [Pt(H20)4](C104)2 stock solution5 has been demonstrated to produce bis[2,4-pentanedionato(l-)]-platinum(II) and other platinum(II) complexes uncontaminated by other metal ions. 

The complexes (l,5-cyclooctadiene)(2,4-pentanedionato)-palladium(II) and platinum(II) tetrafluoroborate are air-stable solids, soluble in polar organic solvents such as chloroform, methylene chloride, acetonitrile, acetone, or methanol but insoluble in nonpolar solvents such as alkanes, benzene, or ether. Their solutions in acetone have conductivities typical of 1 1 electrolytes. Their proton magnetic resonance spectra (in CDC13 solutions, internal tetramethylsilane reference at 60 MHz.) show peaks due to coordinated cyclooctadiene at 3.78 and 6.7-7.4r (Pd) and at 4.25 and 6.9-7.6r (Pt) and due to the chelated /3-diketone at 4.39 and 7.88r (Pd) and at 4.15 and 7.81r (Pt) with the expected area ratios. In the spectrum of the platinum compound coupling with the 95Pt isotope (33 %... 

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