Table 2. Catalytic Properties of Mononuclear Nickel Complexes Ni1_Cl–Ni4_Cl and Ni1_Br–Ni4_Br Activated with MAO^a.

entry	pre-cat.	T	t	Al/Ni	act.	Mwb	Mw/Mnb	Tmc
1	Ni1Cl	30	30	1000	1.7	1.1	1.6	85.1, 104.7
2	Ni1Cl	30	30	1500	1.8	1.0	1.6	93.1, 104.3
3	Ni1Cl	30	30	2000	2.1	1.0	1.6	93.4, 105.1
4	Ni1Cl	30	30	2500	2.6	1.0	1.6	91.5, 103.8
5	Ni1Cl	30	30	3000	2.4	0.9	1.5	80.5, 103.1
6	Ni1Cl	20	30	2500	0.5	1.4	1.7	102.2, 112.3
7	Ni1Cl	40	30	2500	1.9	0.7	1.5	72.1, 95.3
8	Ni1Cl	50	30	2500	1.6	0.7	1.3	75.3
9	Ni1Cl	30	5	2500	2.0	0.9	1.4	81.1, 103.3
10	Ni1Cl	30	15	2500	2.9	1.0	1.5	90.8, 104.2
11	Ni1Cl	30	45	2500	2.5	1.0	1.5	93.4, 104.2
12	Ni1Cl	30	60	2500	2.4	1.0	1.6	90.8, 103.3
13	Ni2Cl	30	30	2500	4.8	10.8	10.3	123.6
14	Ni3Cl	30	30	2500	7.0	0.8	1.6	72.3, 100.4
15	Ni4Cl	30	30	2500	8.3	1.4	2.2	96.5, 116.2
16	Ni1Br	30	30	2500	2.6	1.0	1.6	93.5, 104.9
17	Ni2Br	30	30	2500	2.8	11.7	10.5	124.2
18	Ni3Br	30	30	2500	3.7	1.1	1.7	96.5, 106.5
19	Ni4Br	30	30	2500	5.9	1.5	2.5	97.1, 115.9

^aGeneral 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.

^bM_w in units of kg mol^–1, determined by GPC.

^cT_m in units of °C, determined by DSC.