Synthesis of dinuclear gold-(I) and -(II) complexes by reaction of [AuI2{µ-(CH2)2 PPh2}2] with protonic acids
Abstract
The reaction of the bis(ylide) gold complex
[Au
2
{µ-(CH
2
)
2
PPh
2
}
2
] with strong acids (such as HClO
4
) in the
presence of diphosphines L–L afforded a mixture of heterobridged
gold(I) complexes
[Au
2
{µ-(CH
2
)
2
PPh
2
}(µ-L–L)]
+
(L–L = Ph
2
PCH
2
CH
2
PPh
2
or Ph
2
PCH
2
PPh
2
) and
[PPh
2
Me
2
]
+
. After addition of Li(tcnq),
[Au
2
{µ-(CH
2
)
2
PPh
2
}(µ-L–L)]
2
[ClO
4
][tcnq] were
obtained pure (tcnq = 7,7,8,8-tetracyanoquinodimethane).
The crystal structure of the
Ph
2
PCH
2
CH
2
PPh
2
derivative
shows an intramolecular gold–gold distance of
3.1294(9) Å. The use of weak protonic acids such as
pyridine-2-thiol (C
5
H
5
NS) or
2-sulfanylbenzothiazole (C
7
H
5
NS
2
), in
the presence of atmospheric oxygen, led to complexes of
gold(II). The crystal structure of
[Au
II
2
{µ-(CH
2
)
2
PPh
2
}
2
(C
5
H
4
NS)
2
] shows a gold–gold bond length of
2.6686(13) Å.
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