The compounds Cp
2Ln[N(QPPh
2)
2] (Ln = La (
1), Gd (
2), Er (
3), or Yb (
4) for Q = Se, Ln = Yb (
5) for Q =S) have been synthesized from the corresponding rare-earth tris(cyclopentadienyl) compound and H[N(QPPh
2)
2].The structures of compounds
1,
2,
3, and
5, as determined by X-ray crystallography, consist of a Cp
2Ln fragment,coordinated
3 through two chalcogen atoms and an N atom of the imidodiphosphinochalcogenido ligand[N(QPPh
2)
2]
-. In compound
4, the Cp
2Yb moiety is coordinated
2 through the two Se atoms of the [N(SePPh
2)
2]
-ligand.
31P and
77Se (for
1) NMR spectroscopies lend insight into the solution nature of these species. Crystaldata:
1, C
34H
30LaNP
2Se
2, triclinic,
P![](/images/entities/onemacr.gif)
,
a = 9.7959(10) Å,
b = 12.
4134(13) Å,
c = 13.9077(14) Å,
![](/images/gifchars/alpha.gif)
= 88.106(2)
![](/images/entities/deg.gif)
,
![](/images/gifchars/beta2.gif)
= 88.327(2)
![](/images/entities/deg.gif)
,
![](/images/gifchars/gamma.gif)
= 68.481(2)
![](/images/entities/deg.gif)
,
V = 1572.2(3) Å
3,
T = 153 K,
Z = 2, and
R1(
F) = 0.0257 for the 5947reflections with
I > 2
![](/images/gifchars/sigma.gif)
(
I);
2, C
34H
30GdNP
2Se
2, triclinic,
P![](/images/entities/onemacr.gif)
,
a = 9.7130(14) Å,
b = 12.2659(17) Å,
c = 13.953(2)Å,
![](/images/gifchars/alpha.gif)
= 88.062(2)
![](/images/entities/deg.gif)
,
![](/images/gifchars/beta2.gif)
= 87.613(2)
![](/images/entities/deg.gif)
,
![](/images/gifchars/gamma.gif)
= 69.041(2)
![](/images/entities/deg.gif)
,
V = 1550.7(4) Å
3,
T = 153 K,
Z = 2, and
R1(F) = 0.0323for the 5064 reflections with
I > 2
![](/images/gifchars/sigma.gif)
(
I);
3, C
34H
30ErNP
2Se
2, triclinic,
P![](/images/entities/onemacr.gif)
,
a = 9.704(2) Å,
b = 12.222(3) Å,
c =13.980(4) Å,
![](/images/gifchars/alpha.gif)
= 88.230(4)
![](/images/entities/deg.gif)
,
![](/images/gifchars/beta2.gif)
= 87.487(4)
![](/images/entities/deg.gif)
,
![](/images/gifchars/gamma.gif)
= 69.107(4)
![](/images/entities/deg.gif)
,
V = 1547.4(7) Å
3,
T = 153 K,
Z = 2, and
R1(
F)= 0.0278 for the 6377 reflections with
I > 2
![](/images/gifchars/sigma.gif)
(
I);
4, C
34H
30NP
2Se
2Yb·C
4H
8O, triclinic,
P![](/images/entities/onemacr.gif)
,
a = 12.087(4) Å,
b= 12.429(4) Å,
c = 23.990(7) Å,
![](/images/gifchars/alpha.gif)
= 89.406(5)
![](/images/entities/deg.gif)
,
![](/images/gifchars/beta2.gif)
= 86.368(5)
![](/images/entities/deg.gif)
,
![](/images/gifchars/gamma.gif)
= 81.664(5)
![](/images/entities/deg.gif)
,
V = 3558.8(18) Å
3,
T = 153K,
Z = 4, and
R1(
F) = 0.0321 for the 11 883 reflections with
I > 2
![](/images/gifchars/sigma.gif)
(
I); and
5, C
34H
30NP
2S
2Yb, monoclinic,
P2
1/
n,
a = 13.8799(18) Å,
b = 12.6747(16) Å,
c = 17.180(2) Å,
![](/images/gifchars/beta2.gif)
= 91.102(3)
![](/images/entities/deg.gif)
,
V = 3021.8(7) Å
3,
T = 153K,
Z = 4, and
R1(
F) = 0.0218 for the 6698 reflections with
I > 2
![](/images/gifchars/sigma.gif)
(
I).