10.1021/om900925b
The research focuses on the synthesis, coordination chemistry, and catalytic properties of the first 1,2-bis(diphenylphosphino)-1,2-diphenylhydrazine (PNNP) ligand and its complexes with Ni(II), Pd(II), and Pt(II). The ligand was synthesized by reacting chlorodiphenylphosphine with dilithiohydrazobenzene, and its complexes were formed by treating the ligand with NiCl2(DME), PdCl2(PhCN)2, and PtCl2(COD). The molecular structures of the ligand and its complexes were determined using X-ray diffraction. The catalytic activity of the ligand and its Ni(II) complex was evaluated in the oligo- and polymerization of ethylene using methylaluminoxane (MAO) and triethylaluminium (TEA) as cocatalysts. The experiments involved the preparation of the ligand and its complexes, followed by their application in catalytic reactions under controlled conditions. The products were analyzed using techniques such as gas chromatography, NMR spectroscopy, and melting point measurements.