Unprecedented co-ordination mode of the tetrathio-molybdate or -tungstate anions in heterometallic gold complexes. Crystal structures of [MoS4(AuAsPh3)2] and [WS4(AuCH2PPh3)2]·CH 2Cl2
Abstract
Treatment of the tetrathiometalates
[NH
4
]
2
[MS
4
] (M = Mo or W)
with [AuCl(AsPh
3
)] (molar ratio 1∶2) gave the trinuclear
species [MS
4
(AuAsPh
3
)
2
]
(M = Mo 1 or W 2). Stepwise substitution of
the arsine ligand afforded the complexes
[MS
4
(AuAsPh
3
)(AuPPh
3
)]
(M = Mo 3 or W 4) or
[MS
4
(AuPPh
3
)(AuPPh
2
Me)]
(M = Mo 5 or W 6). The reaction with
gold(I) complexes [AuCl(ylide)] follows a different pathway
depending on the ylide ligand; with the less sterically demanding
CH
2
PPh
2
Me the species
[MS
4
(AuCH
2
PPh
2
Me)
2
]
(M = Mo 7 or W 8) with three-co-ordinate
gold were formed, but the ylide CH
2
PPh
3
led to
[MS
4
(AuCH
2
PPh
3
)
2
]
(M = Mo 9 or W 10) with one three- and one
two-co-ordinate gold centre. The crystal structures of complexes 1
and 10 were determined by X-ray diffraction.
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