Crystallization and X-ray structures of [NaYb(C5H5)3] and Yb(C5H5)2
Abstract
The complex [NaYb(C
5
H
5
)
3
]
(C
5
H
5
= cyclopentadienyl), prepared from
Yb(C
5
H
5
)
3
and sodium naphthalenide in
tetrahydrofuran (thf) or from Yb(C
5
H
5
)
2
and Na(C
5
H
5
) in tetrahydrofuran and crystallized at
ca. 400 °C (<10
-
4
mm Hg), is a
three-dimensional polymer in which
µ-η
5
:η
5
-C
5
H
5
groups
link sodium and ytterbium (each metal having a pseudo-triangular
arrangement of C
5
H
5
ligands);
Yb(C
5
H
5
)
2
, similarly crystallized, has a
polymeric chain structure with one terminal and two bridging
C
5
H
5
ligands per ytterbium, and there is
η
1
-bonding between adjacent chains.
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