Synthesis and characterisation of new N1-alkyl-3,5-dipyridylpyrazole derived ligands. Study of their reactivity with Pd(II) and Pt(II)

Two new pyrazole-derived ligands, 1-ethyl-3,5-bis(2-pyridyl)pyrazole (L1) and 1-octyl-3,5-bis(2-pyridyl)pyrazole (L2), both containing alkyl groups at position 1 were prepared by reaction between 3,5-bis(2-pyridyl) pyrazole and the appropriate bromoalkane in toluene using sodium ethoxide as base. The reaction between L1, L2 and [MCl2(CH3CN)2] (M = Pd(II), Pt(II)) resulted in the formation complexes of formula [MCl2(L)] (M = Pd(II), L = L 1 (1); M = Pd(II), L = L2 (2); M = Pt(II), L = L 1 (3); M = Pt(II), L = L2 (4)). These complexes were characterised by elemental analyses, conductivity measurements, infrared, 1H, 13C{1H} NMR and HMQC spectroscopies. The X-ray structure of the complex [PtCl2(L2)] (4) was determined. In this complex, Npyridine and Npyrazole donor atoms coordinate the ligand to the metal, which complete its coordination with two chloro ligands in a cis disposition. © 2005 Elsevier B.V. All rights reserved.