Organonickel(II) complexes with anionic tridentate 1, 3-bis(azolylmethyl)phenyl ligands. synthesis, structural characterization and catalytic behavior
作者:John Hurtado、Andrés Ibañez、René Rojas、Mauricio Valderrama、Roland Fröhlich
DOI:10.1590/s0103-50532011000900018
日期:——
The reaction of 2-bromo-1,3-bis(bromomethyl) benzene with 3,5-dimethylpyrazole and 1H-indazole yields the tridentate ligands 2-bromo-1,3-bis(3,5-dimethylpirazol-1-ylmethyl)benzene (1) and 2-bromo-1,3-bis(indazol-2-ylmethyl)benzene (2). These compounds react with [Ni(cod)(2)] in tetrahydrofuran (thf) to form the oxidative addition complexes [NiBr1,3-bis(azolylmethyl) phenyl-N, C, N}], azol = 3,5-dimethylpyrazol (3), indazol (4), which were isolated in good yields as stable yellow solids and characterized by elemental analysis, Fourier-transform infrared spectroscopy (FTIR), mass spectroscopy and nuclear magnetic resonance (NMR). In addition, the molecular structures of 2 and 4 were determined by single-crystal X-ray diffraction analysis. Complex 4 was tested as a catalyst in ethylene polymerization reaction.