PALLADIUM(II) COORDINATION AND CYCLOMETALATED COMPLEXES DERIVED FROM 1-TERT-BUTYLPYRAZOLE

The synthesis and characterization of a number of new coordination compounds of Pd(II) with the nitrogen donor 1-tert-butylpyrazole ((t)BuPzH) are described. Compounds are trans-[Pd((t)BuPzH)2Cl2] and the cyclometallated structures [Pd2((t)BuPz)2(AcO)2] and [Pd3((t)BuPz)2(AcO)4]. All these complexes are mixtures of syn and anti isomers. Also, the chloro-bridged complex [Pd2((t)BuPz)2Cl2] has been isolated as an equilibrium mixture of cis and trans isomers. The compounds have been studied by variable temperature H-1- and C-13-NMR spectroscopy.