Crystal structures and non-linear optical properties of cluster
compounds [MAu2S4(AsPh3)2]
(M = Mo or W)
†
Abstract
The compounds
[MAu
2
S
4
(AsPh
3
)
2
]
(M = Mo 1 or W 2) were synthesized by reactions of
[NEt
4
]
2
[MS
4
] (M = Mo or
W), HAuCl
4
·4H
2
O and AsPh
3
in
CH
2
Cl
2
solution. X-Ray crystallographic structure
determinations show that the co-ordination of Mo(W) is slightly
distorted from tetrahedral and those of the Au are distorted from
trigonal planar. High non-linear susceptibilities of these
gold-containing clusters were also observed for the first time. Z-Scan
data measured with 532 nm nanosecond laser pulses showed that effective
third-order non-linearities
α
2
= 7.9 × 10
-5
and 13 × 10
-5
dm
3
cm W
-1
mol
-1
and
n
2
= -8.0 ×
10
-10
and
19 × 10
-10
dm
3
cm
2
W
-1
mol
-1
,
respectively, for a 0.64 mmol dm
-3
solution of compound
1 and a 0.54 mmol dm
-3
solution of 2.
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†