Reaction of Me
2Si(C
9H
7)Cl with 1 equiv of
Li2C
2B
10H
10 gave, after hydrolysis, the newversatile
ligand Me
2Si(C
9H
7)(C
2B
10H
11) (
1).
1 can be conveniently converted into themonoanion [Me
2Si(C
9H
6)(C
2B
10H
11)]
- (
2) and the dianion [Me
2Si(C
9H
6)(C
2B
10H
10)]
2- (
3) bytreatment with 1 equiv or excess amounts of NaH, respectively. Treatment of SmI
2 with
2in THF gave the unexpected redox product [
5:
6-Me
2Si(C
9H
6)(C
2B
10H
11)]Sm(THF)
2 (
4).Reaction of SmI
2 with 1 equiv of
3 in THF, followed by reaction with
2, gave the unexpectedC-H bond reduction product [{
5:
![](/images/gifchars/sigma.gif)
-Me
2Si(C
9H
6)(C
2B
10H
10)}
2Sm][Na(THF)
6] (
5). In contrast,reaction of YbI
2 with 1 or 2 equiv of
2 afforded [{
5-Me
2Si(C
9H
6)(C
2B
10H
11)}Yb(
![](/images/entities/mgr.gif)
-I)(THF)
2]
2(
6) or [
5-Me
2Si(C
9H
6)(C
2B
10H
11)]
2Yb(THF)
2 (
7), respectively. Treatment of YbI
2 with 1 equivof
3 in THF gave [
5:
![](/images/gifchars/sigma.gif)
-Me
2Si(C
9H
6)(C
2B
10H
10)]Yb(THF)
3 (
8), which is the first mixed-
ligandorganolanthanide(II) complex containing both Ln-C
![](/images/gifchars/pi.gif)
and
![](/images/gifchars/sigma.gif)
bonds to be reported.
8 canalso be prepared from the reaction of
6 with excess NaH in THF. Reaction of
8 with 1 equivof
2 in THF yielded [
5-Me
2Si(C
9H
6)(C
2B
10H
11)]Yb(THF)[(
![](/images/entities/mgr.gif)
-
5):
![](/images/gifchars/sigma.gif)
-Me
2Si(C
9H
6)(C
2B
10H
10)]Na(THF)
3 (
9), which can also be prepared by reaction of
7 with 1 equiv of NaH in THF. Thesenew complexes have been fully characterized by
1H,
13C, and
11B NMR, IR spectroscopy,and elemental analyses. The molecular structures of
4,
5,
8, and
9 have been furtherconfirmed by single-crystal X-ray analyses.