A series of α-aminopyridines in the form of (2,6-C6H3N)(R1)(CHR2NR3R4) (R1 = R2 = H R3 = H R4 = iPr (L1a), R4 = tBu (L1b), R4 = Ph (L1c), R4 = 2,6-Me2C6H3 (L1d), R4 = 2,6-iPr2C6H3 (L1e), R1 = R2 = H R3 = R4 = Et (L1f), R1 = H R2 = Me R3 = H R4 = iPr (L2a), R4 = Ph (L2c), R4 = 2,6-Me2C6H3 (L2d), R4 = 2,6-iPr2C6H3 (L2e), R1 = Me R2 = H R3 = H R4 = 2,6-iPr2C6H3 (L3e)) and β-aminopyridines in the form of (2-C6H4N)(CH2CH2NR1R2) (R1 = H R2 = iPr (4a), R2 = tBu (L4b), R1 = R2 = Et (L4f)) have been prepared. Their corresponding halonickel complexes 1a–4f are synthesized by ligand substitution from (DME)NiBr2 and the molecular structures are characterized. Four types of coordination modes include four-coordinate mononuclear species with one ligand, five-coordinate mononuclear species with two ligands, five-coordinate dinuclear species with two ligands, and a six-coordinate polymeric framework were determined by X-ray crystallography. Using methylaluminoxanes (MAO) as the activator, the nickel complexes can catalyze ethylene polymerization under moderate pressure and ambient temperature. The activity reaches 105 g PE mol−1 Ni h. The PE products with high branching and high crystallinity have Mn ∼ 103 with PDI < 2.
一系列α-
氨基
吡啶类化合物(2,6-
C6H3N)(R1)(CHR2NR3R4)(R1 = R2 = H, R3 = H, R4 = iPr (L1a), R4 = tBu (L1b), R4 = Ph (L1c), R4 = 2,6-Me2C6H3 (L1d), R4 = 2,6-iPr2C6H3 (L1e), R1 = R2 = H, R3 = R4 = Et (L1f), R1 = H, R2 = Me, R3 = H, R4 = iPr (
L2a), R4 = Ph (
L2c), R4 = 2,6-Me2C6H3 (
L2d), R4 = 2,6-iPr2C6H3 (
L2e), R1 = Me, R2 = H, R3 = H, R4 = 2,6-iPr2C6H3 (L3e))和β-
氨基
吡啶类化合物(2-
C6H4N)(CH2CH2NR1R2)(R1 = H, R2 = iPr (4a), R2 = tBu (L4b), R1 = R2 = Et (L4f))已被合成。通过
配体取代反应从(
DME)NiBr2合成相应的卤化
镍配合物1a–4f,并由X射线晶体学表征其分子结构。通过X射线结晶学确定了四种配位模式,包括单核四配位物种与一个
配体、单核五配位物种与两个
配体、双核五配位物种与两个
配体以及六配位的聚合框架。使用
甲基铝氧烷(
MAO)作为活化剂,
镍配合物可以在中等压力和室温下催化
乙烯聚合。活性达到105 g PE mol−1 Ni h。具有高度支化和高度结晶性的PE产品,Mn ∼ 103,PDI < 2。