Activating catalysts with mechanical force

A. Piermattei, S. Karthikeyan, R.P. Sijbesma

Research output: Contribution to journalArticleAcademicpeer-review

406 Citations (Scopus)
5 Downloads (Pure)

Abstract

Homogeneously catalysed reactions can be ‘switched on’ by activating latent catalysts. Usually, activation is brought about by heat or an external chemical agent. However, activation of homogeneous catalysts with a mechanical trigger has not been demonstrated. Here, we introduce a general method to activate latent catalysts by mechanically breaking bonds between a metal and one of its ligands. We have found that silver(I) complexes of polymer-functionalized N-heterocyclic carbenes, which are latent organocatalysts, catalyse a transesterification reaction when exposed to ultrasound in solution. Furthermore, ultrasonic activation of a ruthenium biscarbene complex with appended polymer chains results in catalysis of olefin metathesis reactions. In each case, the catalytic activity results from ligand dissociation, brought about by transfer of mechanical forces from the polymeric substituents to the coordination bond. Mechanochemical catalyst activation has potential applications in transduction and amplification of mechanical signals, and mechanically initiated polymerizations hold promise as a novel repair mechanism in self-healing materials.
Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalNature Chemistry
Volume1
Issue number2
DOIs
Publication statusPublished - 2009

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