The monomeric fragment In-C(SiMe
3)
3 witha monovalent indium atom is isolobal with carbon monoxide.Itis probably formed as a reactive intermediate on heating solutions ofthe tetrahedral cluster compoundIn
4[C(SiMe
3)
3]
4(
1) in hexane and reacts withFe
3(CO)
12 andFe
2(CO)
9 to yield by the substitution ofbridging COligands three novel iron indium compounds,Fe
3(CO)
10(
![](/images/entities/mgr.gif)
-InR)
2(
2), Fe
2(CO)
8(
![](/images/entities/mgr.gif)
-InR)(
3), andFe
2(CO)
6(
![](/images/entities/mgr.gif)
-CO)(
![](/images/entities/mgr.gif)
-InR)
2 (
4), which all were characterized bycrystal structure determinations (
2:C
30H
54Fe
3In
2O
10Si
6,monoclinic,
P2
1/
n,
a =1436.1(2) pm,
b = 1992.9(3) pm,
c =1764.8(3) pm,
![](/images/gifchars/beta2.gif)
= 107.02(2)
![](/images/entities/deg.gif)
.
3:C
18H
27Fe
2InO
8Si
3,monoclinic,
C2/
c,
a = 1527.8(3) pm,
b = 960.3(2) pm,
c = 3755.4(8) pm,
![](/images/gifchars/beta2.gif)
= 90.17(3)
![](/images/entities/deg.gif)
.
4:C
27H
54Fe
2In
2O
7Si
6,triclinic,
P![](/images/entities/onemacr.gif)
,
a = 959.3(1) pm,
b= 1506.7(2) pm,
c = 1561.4(1) pm,
![](/images/gifchars/alpha.gif)
=86.11(1)
![](/images/entities/deg.gif)
,
![](/images/gifchars/beta2.gif)
= 88.76(1)
![](/images/entities/deg.gif)
,
![](/images/gifchars/gamma.gif)
=73.57(1)
![](/images/entities/deg.gif)
).While both products
2 and
4 areisostructural with the pure carbonyls with two or three bridginggroups, respectively,compound
3 has only one bridging InR group besides eightterminal carbonyl ligands. The Fe-In bond lengthsare quite similar (255.9-260.5 pm), but the Fe-Fe distances differsignificantly with 286.7(1) pm for the bridgedFe-Fe bond in
2, 289.3(1) pm in
3, and275.87(5) pm in
4. They all are much elongatedcompared to thestarting carbonyl complexes.