The synthesis of palladium cyclometallated compounds with thiosemicarbazone ligands is described, as well as their reactivity with bidentate phosphine ligands. The synthesis of the ligands was carried out by a condensation reaction between a ketone and a thiosemicarbazide. Subsequently, metalation proceeds and the resulting product is reacted with bis(diphenylphosphino)methane (dppm) under the appropriate conditions to yield the compound with monocoordinated diphosphine.
In a typical condensation reaction, Schiff Base ligands were synthetized from 2,4,6trimethylaniline and the appropriate aldehydes. Treatment of the ligands with the corresponding palladium salt provided dinuclear cyclometallated compounds with bridging acetate moieties. The X-ray crystal structure analysis carried out was in agreement with the spectroscopic data. Herein we describe the preparation of the complexes; a brief discussion of the crystal structure is also given. The resulting dinuclear palladacycles are suitable for further ligand-exchange processes.
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