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Pyridine Functionalized N‑Heterocyclic Silane Complexes of Iridium and Rhodium–An Unexpected Change in Coordination
journal contribution
posted on 2017-12-19, 18:23 authored by Felix Kaiser, Robert M. Reich, Eric Rivard, Fritz E. KühnA new
pyridine functionalized N-heterocyclic silane with ambident
reactivity as a ligand has been synthesized and characterized by NMR
spectroscopy (1H, 13C{1H}, 29Si), mass spectrometry, elemental analysis, and X-ray crystallography.
This ligand reacts with iridium and rhodium cod precursors (cod =
1,5-cyclooctadiene) to yield two new complexes that possess divergent,
and unexpected, binding properties. In particular, no oxidative addition
occurs at the intraligand Si-H unit. With the iridium(I) center, the
ligand acts as a tertiary amino-pyridine chelator, whereas coordination
of rhodium(I) to the ligand occurs with arene π-complexation
on an opposite side. The latter interaction yields an unprecedented,
electronically induced, coordination change at the silicon center
over a long spatial distance. The new iridium and rhodium compounds
are of high interest as they provide two potentially different reactions
sites in one complex and as these sorts of complexes are known to
activate small molecules like dihydrogen or silanes. Hence, the compounds
are promising candidates for applications in tandem catalysis. Furthermore,
the rhodium complex might be utilized for molecular switches, sensors,
and comparable applications.
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tandem catalysisrhodium compoundsrhodium cod precursorsarene π- complexationamino-pyridine chelator1 Hbinding propertiescoordination changelatter interaction yieldsX-ray crystallographyiridiumoxidative additionsilicon centerpyridine functionalized N-heterocyclic silaneapplicationNMR spectroscopyambident reactivityligand actsreactions sitesintraligand Si-H unit
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