摘要:
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。