Table 3. Catalytic Properties of Binuclear Nickel Complexes Ni5Cl–Ni7Cl and Ni5Br–Ni7Br Activated with MAOa.
| entry | pre-cat. | T | t | Al/Ni | act. | Mwb | Mw/Mnb | Tmc |
|---|---|---|---|---|---|---|---|---|
| 1 | Ni5Cl | 30 | 30 | 1000 | 1.1 | 3.1 | 3.1 | 80.2, 103.3, 121.5 |
| 2 | Ni5Cl | 30 | 30 | 1500 | 2.6 | 2.3 | 2.7 | 73.7, 100.4, 119.4 |
| 3 | Ni5Cl | 30 | 30 | 2000 | 2.7 | 1.8 | 2.3 | 100.7, 117.3 |
| 4 | Ni5Cl | 30 | 30 | 2500 | 3.0 | 1.6 | 2.1 | 98.5, 115.2 |
| 5 | Ni5Cl | 30 | 30 | 3000 | 2.8 | 1.5 | 1.9 | 110.3, 116.6 |
| 6 | Ni5Cl | 20 | 30 | 2500 | 1.9 | 2.4 | 2.4 | 104.7, 115.3, 120.2 |
| 7 | Ni5Cl | 40 | 30 | 2500 | 2.2 | 1.3 | 2.0 | 77.3, 95.3, 113.9 |
| 8 | Ni5Cl | 50 | 30 | 2500 | 1.9 | 1.1 | 2.0 | 72.3, 96.8, 115.0 |
| 9 | Ni5Cl | 30 | 5 | 2500 | 2.2 | 1.3 | 1.7 | 83.1, 104.7, 116.4 |
| 10 | Ni5Cl | 30 | 15 | 2500 | 3.6 | 1.5 | 1.8 | 106.5, 119.0 |
| 11 | Ni5Cl | 30 | 45 | 2500 | 2.7 | 1.6 | 2.2 | 98.1, 115.7 |
| 12 | Ni5Cl | 30 | 60 | 2500 | 2.7 | 1.9 | 2.5 | 99.9, 117.7 |
| 13 | Ni6Cl | 30 | 30 | 2500 | 3.0 | 11.8 | 8.9 | 124.7 |
| 14 | Ni7Cl | 30 | 30 | 2500 | 4.8 | 1.2 | 1.7 | 99.0, 105.6, 116.8 |
| 15 | Ni5Br | 30 | 30 | 2500 | 1.3 | 1.7 | 1.9 | 77.4, 104.6, 117.7 |
| 16 | Ni6Br | 30 | 30 | 2500 | 1.5 | 13.3 | 8.9 | 125.3 |
| 17 | Ni7Br | 30 | 30 | 2500 | 3.2 | 1.5 | 2.0 | 98.8, 106.1, 116.8 |
a
General conditions: 2.0 μmol of Ni, 100 mL of toluene for 10 atm of ethylene, T in units of °C, t in units of min, and activity in units of 106 g of PE (mol of Ni)−1 h–1.
b
Mw in units of kg mol–1, determined by GPC.
c
Tm in units of °C, determined by DSC.