PLATINUM(II) AND PALLADIUM(II) COMPLEXES DERIVED FROM THE MONOANION OF ISATIN (2,3-DIHYDROINDOLE-2,3-DIONE, HISAT) - CRYSTAL-STRUCTURE OF CIS-[PT(ISAT)(2)(PPH3)(2)]

A number of platinum(II) and palladium(II) complexes containing the mo noanion of isatin (2, 3-dihydroindole-2, 3-dione, Hisat) have been syn thesized by reaction of the metal halide complex with isatin, in the p resence of triethylamine. The complexes have been characterised by NMR and IR spectroscopies and elemental analysis. A single-crystal X-ray diffraction study has been carried out on cis-[Pt(isat)(2)(PPh3)(2)], which shows two cis-isat ligands with their dicarbonyl functions point ing in opposite directions. Electrospray mass spectrometry was also us ed for characterisation; the complexes show a strong tendency to form aggregate ions with ammonium ions, and both mono- and di-cationic spec ies are observed.