Reactivity of the ligand bis[2-(3,5-dimethyl-1-pyrazolyl)ethyl]ether (L1) with Pd(II) and Pt(II): crystal structure of cis-[PtCl2(L1)]

The coordination chemistry of the ligand bis[2-(3,5-dimethyl-1-pyrazolyl)ethyl]ether (L1) was tested in front of Pd(II) and Pt(II). Complexes cis-[MCl2(L1)] (M=Pd(II) and Pt(II)) were obtained, due to the chelate condition of the ligand and the formation of a stable 10-membered ring. The crystal structure of cis-[PtCl2(L1)] was resolved by X-ray diffraction. Treatment of [PdCl2(L1)] or [Pd(CH3CN)4](BF4)2 with AgBF4 in the presence of L1 gave the complex [Pd(L1)2](BF4)2. The initial cis-[PdCl2(L1)] was recovered by reacting [Pd(L1)2](BF4)2 with an excess of NEt4Cl. Reaction of [Pt(CH3CN)4](BF4)2 (generated in situ from [PtCl2(CH3CN)2] and AgBF4 in acetonitrile) with ligand L1 yields complex [Pt(L1)2](BF4)2.