The reaction of
C
6
H
10
(NLiSiMe
3
)
2
-1,2
(Li
2
L
1
) with
[ZrCl
4
(thf)
2
]
(thf = tetrahydrofuran) afforded the tetraamide
[ZrL
1
2
] 1. Similarly treatment of
(RHNSiMe
2
)
2
O (H
2
L
2
,
R = Bu
t
; H
2
L
3
,
R = cyclohexyl) with LiBu
n
followed by
[ZrCl
4
(thf)
2
] led to
[ZrL
2
2
] 2 and [ZrL
3
2
] 3,
respectively. Reaction of Zr(CH
2
Ph)
4
with
H
2
L
3
gave the pale yellow zirconium dibenzyl
compound [Zr(CH
2
Ph)
2
L
3
] 4, while the
analogous reaction with H
2
L
4
(R = quinolin-8-yl) led to ruby-red
[Zr(CH
2
Ph)
2
L
4
] 5. In addition the
bis(pyrrole)
[(2-C
4
H
3
NH)CHNCH
2
]
2
(H
2
L
5
) reacted with
Zr(CH
2
Ph)
4
giving the complex
[Zr(CH
2
Ph)
2
L
5
] 6. The crystal
structures of 1, 4 and 5 have been determined. Compound 1 has a
distorted tetrahedral structure. In 4 and 5 all available donor atoms
co-ordinate to zirconium, including the silyl ether moiety, leading to a
distorted trigonal bipyramidal structure for 4 and an approximately
pentagonal bipyramidal geometry for 5. Although L
3
and
L
4
have flexible frameworks, in both 4 and 5 the heteroatom
donors and the metal form an essentially coplanar arrangement. The
zirconium–amido nitrogen distances proved to be highly variable,
depending on the degree of electron deficiency and the co-ordination of
the metal centres, and range from an average of 2.056 Å in 1 and
2.096 Å in 4 to 2.169 Å in 5. Complexes 1 and 4 activated
with methylaluminoxane gave high molecular weight polyethylene with
moderate activity.
反应为
C
6
H
10
(NLiSiMe
3
)
2
-1,2
(李
2
L
1
) 和
[
氯化
锆
4
(
四氢呋喃)
2
]
(thf =
四氢呋喃) 得到四酰胺
[ZrL
1
2
] 1.同样处理
(RHNSSiMe
2
)
2
哦
2
L
2
,
R = 卜
t
; H
2
L
3
,
R = 环己基) 与 LiBu
n
其次是
[
氯化
锆
4
(
四氢呋喃)
2
] 导致
[ZrL
2
2
] 2 和 [ZrL
3
2
] 3、
分别。 Zr(
CH3)的反应
2
博士)
4
和
H
2
L
3
得到浅黄色二苄基
锆
化合物[Zr(CH
2
博士)
2
L
3
] 4、同时
与H的类似反应
2
L
4
(R = quinolin-8-yl) 产生红宝石色
[Zr(CH
2
博士)
2
L
4
] 5.此外
双(
吡咯)
[(2-C
4
H
3
NH)CHNCH
2
]
2
(H
2
L
5
)反应了
锆(CH
2
博士)
4
给予复杂的
[Zr(CH
2
博士)
2
L
5
] 6.
水晶
1、4和5的结构已确定。化合物1具有
扭曲的四面体结构。在4和5中所有可用的供体原子
与
锆配位,包括
硅醚部分,导致
扭曲的三角双锥体结构为 4 和近似
5 的五角双锥几何形状。虽然 L
3
和
L
4
具有灵活的框架,在 4 和 5 杂原子中
供体和
金属形成基本上共面的排列。这
锆-
氨基氮距离被证明是高度可变的,
取决于缺电子的程度和配位
金属中心,平均范围为 1 和 2.056 Å
4 中为 2.096 Å 至 5 中为 2.169 Å。复合物 1 和 4 被激活
与甲基铝氧烷反应得到高分子量聚
乙烯
适度的活动。