Nickel(II) complexes bearing pyrazolylimine ligands: Synthesis, characterization, and catalytic properties for ethylene oligomerization
作者:Yuan-yuan Wang、Shang-an Lin、Fang-ming Zhu、Hai-yang Gao、Qing Wu
DOI:10.1016/j.ica.2008.03.068
日期:2009.1
phenyl-substituted pyrazolylimine ligands 2-(C 3 HN 2 Me 2 -3,5)(C(Ph) N(4-R 2 C 6 H 2 (R 1 ) 2 -2,6)) ( L1 : R 1 = i Pr, R 2 = H; L2 : R 1 = H, R 2 = NO 2 ; L3 : R 1 = R 2 = H; L4 : R 1 = H, R 2 = OCH 3 ) were synthesized. The influences of steric bulk and electronic effect of pyrazolylimine ligands on the structures of their corresponding nickel complexes were investigated. Ligands with more bulky and electron
四个苯基取代的吡唑基亚胺配体2-(C 3 HN 2 Me 2 -3,5)(C(Ph)N(4-R 2 C 6 H 2(R 1)2 -2,6))(L1:R 1 = iPr,R 2 = H; L 2:R 1 = H,R 2 = NO 2; L3:R 1 = R 2 = H; L4:R 1 = H,R 2 = OCH 3)。研究了吡唑基亚胺配体的空间体积和电子效应对其相应镍配合物结构的影响。在N-苯环上具有更大体积和吸电子取代基的配体产生四配位镍络合物(2-(C 3 HN 2 Me 2 -3,5))(C(Ph)(4-R 2 C 6 H 2( R 1)2 -2,6)NiBr 2(1,R 1 = i Pr,R 2 = H; 2,R 1 = H,R 2 = NO 2)),而具有较小体积和供电子取代基的配体N-苯基环上形成的双吡唑基亚胺二卤化四卤化物(bis-2-(C 3 HN 2 Me 2 -3,5))(C(Ph)N(4-R