Abstract
Dinuclear gold complexes have the ability to interact with one or more substrates in a dual‐activation mode, leading to different reactivity and selectivity than their mononuclear relatives. In this contribution, this difference was used to control the catalytic properties of a gold‐based catalytic system by site‐isolation of mononuclear gold complexes by selective encapsulation. The typical dual‐activation mode is prohibited by this catalyst encapsulation, leading to typical behavior as a result of mononuclear activation. This strategy can be used as a switch (on/off) for a catalytic reaction and also permits reversible control over the product distribution during the course of a reaction.
Highlights
Dinuclear gold complexes have the ability to interact with one or more substrates in a dual-activation mode, leading to different reactivity and selectivity than their mononuclear relatives
In a previous paper we reported the encapsulation of an N-heterocyclic carbene (NHC) mononuclear gold(I) complex inside a self-assembled hexameric resorcin[4]arene cage 16 and showed that the encapsulated catalyst gives a different product distribution than the free complex.[13]
We anticipated that by complex encapsulation we could reversibly switch between the dinuclear and mononuclear catalyst and, have a tool to shift from dual gold catalysis to a mononuclear reaction mechanism
Summary
Dinuclear gold complexes have the ability to interact with one or more substrates in a dual-activation mode, leading to different reactivity and selectivity than their mononuclear relatives. Report how we change the active gold complex from dinuclear to mononuclear by reversible encapsulation and demonstrate that this can be used for both switching on/off a reaction, as well as for controlling its selectivity during the course of a reaction.
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