Table 1 Optimized polymerization results using iron complexes ligated by unsymmetrical bis(imino)pyridines bearing benzhydryl derivatives (under a
pressure of 10 atm)
Pre-catalyst
a
Co-catalyst Al/Fe
T (
C) Time (min) Activity
b
Mw
c
Mw/Mn
d
T m
e
(
C) References
Type
Θ
R
R
1
R
2
3A
Ph
Me Et
Me MAO
1,500 60
30
22.3
99.8
8.3
132.7
[49]
3A
Ph
Me Me Me MMAO
2,000 80
30
22.4
25.5
5.1
129.7
[49]
3A
Ph
Cl
Me Me MAO
2,500 80
30
14.3
23.0
2.8
130.2
[52]
3A
Ph
Cl
Me Me MMAO
2,500 60
30
24.6
42.0
5.1
128.6
[52]
3A
FPh Me Me Me MMAO
2,250 60
15
35.2
94.5
13.0
131.8
[53, and unpublished data]
3B
–
–
iPr
H
MAO
3,000 60
30
26.2
18.7
4.4
128.4
[50]
3B
–
–
Et
Me MMAO
3,000 70
30
23.3
12.1
3.5
127.6
[50]
MAO methylaluminoxane,
MMAO modified methylaluminoxane
a
See Scheme 1
b
10
6
g mol
À1
(Fe) h
À1
c
Molecular weight, as determined by GPC
d
Polydispersity (weight average molecular weight/number average molecular weight), as determined by GPC
e
Melting temperature, as determined by DSC
168
W.-H. Sun