Abstract
On thermolysis of a toluene solution containing [Fe
3
(CO)
9
(µ
3
-E)
2
] (E = S 1a, Se 16 or Te 1c) and [W(η
5
-C
5
Me
5
)
2
(CO)
3
(C&z.tbd6;CPh)] 2 the new clusters [W
2
Fe
3
(η
5
-C
5
Me
5
)
2
(CO)
6
(µ
3
-E)
2
{µ
4
-CC(Ph)C(Ph)C}] (E = S 3, Se 4 or Te 5) were isolated. Compounds 3-5 were characterised by IR and
1
H,
13
C,
77
Se and
125
Te NMR spectroscopy. The crystal structure of 3 was elucidated by X-ray diffraction methods. It shows a novel tail-to-tail coupling of substituted acetylides on a sulfur-bridged mixed-metal Fe-W cluster.