Reaction of [MCl2(CH3CN)(2)] (M = Pd(II), Pt(II)) compounds with N1-alkylpyridylpyrazole-derived ligands

摘要

Palladium(II) and platinum(II) complexes with N-alkylpyridylpyrazole-derived ligands, 2-(1-ethyl-5-phenyl-1H-pyrazol-3-yl)pyridine (L-1) and 2-(1-octyl-5-phenyl-1H-pyrazol-3-yl)pyridine (L-2), cis-[MCl2(L)] (M = Pd(II), Pt(II)), have been synthesised. Treatment of [PdCl2(L)] (L = L-1, L-2) with excess of ligand (L-1, L-2), pyridine (py) or triphenylphosphine (PPh3) in the presence of AgBF4 and NaBPh4 produced the following complexes: [Pd(L)(2)](BPh4)(2), [Pd(L)(PY)(2)](BPh4)(2) and [Pd(L)(PPh3)(2)](BPh4)(2). All complexes have been characterised by elemental analyses, conductivity, IR and NMR spectroscopies. The crystal structures of cis-[PdCl2(L-2)] (2) and CiS-[PtCl2(L-1)] (3) were determined by a single crystal X-ray diffraction method. In both complexes, the metal atom is coordinated by one pyrazole nitrogen, one pyridine nitrogen and two chlorine atoms in a distorted square-planar geometry. In complex 3, pi-pi stacking between pairs of molecules is observed. (c) 2005 Elsevier B.V. All rights reserved.