Chromium(III) complexes with terdentate 2,6-bis(azolylmethyl)pyridine ligands: Synthesis, structures and ethylene polymerization behavior
作者:John Hurtado、Desmond Mac-Leod Carey、Alvaro Muñoz-Castro、Ramiro Arratia-Pérez、Raúl Quijada、Guang Wu、René Rojas、Mauricio Valderrama
DOI:10.1016/j.jorganchem.2009.04.014
日期:2009.7
Reactions of 2,6-bis(bromomethyl)pyridine with 3,5-dimethylpyrazole and 1H-indazole yield the terdentate ligands 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine (5) and 2,6-bis(indazol-2-ylmethyl)pyridine (6). The molecular structure of the new compound 6 was determined by single-crystal X-ray diffraction. These ligands react with the CrCl3(THF)3 complex in THF to form neutral complexes of general formula
2,6-双(溴甲基)吡啶与3,5-二甲基吡唑和1H-吲唑的反应产生了叔齿配体2,6-双(3,5-二甲基吡唑-1-基甲基)吡啶(5)和2,6-双(吲唑-2-基甲基)吡啶(6)。通过单晶X射线衍射确定新化合物6的分子结构。这些配体与反应的CrCl 3(THF)3的THF复合物以形成通式的中性配合率[CrCl 3 2,6-双(吖唑)吡啶Ñ,Ñ,Ñ }](7,8),以稳定的绿色固体高收率分离,并通过元素分析,磁矩,IR和质谱法进行表征。理论计算预测,配合物的热力学优选结构为fac构型。与甲基铝氧烷(MAO)反应后,铬(III)络合物在乙烯的聚合反应中具有活性。