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Alternatively, the complexes can be prepared by direct addition of the
thioether to In solutions with an excess thioether, the thioether
ligand is in rapid exchange with In (1:1) the complex,
is formed after the addition of 2 eq of thioether to 1 eq of
This suggests that thioethers bind strongly to Au(I).
The
equilibrium constants
and
have been determined for the displacement
and other ligands
33,42
, and
of
in
by
log is 10.6 for the latter one.
Because Au(I) is a 2-electron reducing agent while is a 4-electron
oxidizing agent, the reaction between them requires either formation
(in protic media) or the formation of other intermediates. So far no
experimental data on this re-oxidation reaction are available, therefore only a
highly speculative mechanism could be proposed, Scheme 2:
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