Controlling Coordination Geometries: Ru-Carbene Complexes with Tetra-NHC Ligands

Manuela Hollering; Daniel T. Weiss; Mario J. Bitzer; Christian Jandl; Fritz E. Kühn

doi:10.1021/acs.inorgchem.6b00509

Controlling Coordination Geometries: Ru-Carbene Complexes with Tetra-NHC Ligands

Manuela Hollering, Daniel T. Weiss, Mario J. Bitzer, Christian Jandl, Fritz E. Kühn

Associate Professorship of Molecular Catalysis

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

The synthesis of the first ruthenium(II) complexes bearing open-chain tetra-N-heterocyclic carbene (tetra-NHC) ligands via in situ transmetalation is described. The ruthenium complexes show differing coordination geometries depending on the length of the alkyl linker. Replacement of the two cis acetonitrile ligands in the methylene bridged ruthenium complex by nucleophiles also influences the coordination geometry. Both structural motifs were evaluated in transfer hydrogenation (TH) of acetophenone, and in particular the sawhorse-Type coordinated system exhibits remarkable activity with turnover frequencies of more than 100â"000 h^-1.

Original language	English
Pages (from-to)	6010-6017
Number of pages	8
Journal	Inorganic Chemistry
Volume	55
Issue number	12
DOIs	https://doi.org/10.1021/acs.inorgchem.6b00509
State	Published - 20 Jun 2016

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abstract = "The synthesis of the first ruthenium(II) complexes bearing open-chain tetra-N-heterocyclic carbene (tetra-NHC) ligands via in situ transmetalation is described. The ruthenium complexes show differing coordination geometries depending on the length of the alkyl linker. Replacement of the two cis acetonitrile ligands in the methylene bridged ruthenium complex by nucleophiles also influences the coordination geometry. Both structural motifs were evaluated in transfer hydrogenation (TH) of acetophenone, and in particular the sawhorse-Type coordinated system exhibits remarkable activity with turnover frequencies of more than 100{\^a}{"}000 h-1.",

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AU - Hollering, Manuela

AU - Weiss, Daniel T.

AU - Bitzer, Mario J.

AU - Jandl, Christian

AU - Kühn, Fritz E.

PY - 2016/6/20

Y1 - 2016/6/20

N2 - The synthesis of the first ruthenium(II) complexes bearing open-chain tetra-N-heterocyclic carbene (tetra-NHC) ligands via in situ transmetalation is described. The ruthenium complexes show differing coordination geometries depending on the length of the alkyl linker. Replacement of the two cis acetonitrile ligands in the methylene bridged ruthenium complex by nucleophiles also influences the coordination geometry. Both structural motifs were evaluated in transfer hydrogenation (TH) of acetophenone, and in particular the sawhorse-Type coordinated system exhibits remarkable activity with turnover frequencies of more than 100â"000 h-1.

AB - The synthesis of the first ruthenium(II) complexes bearing open-chain tetra-N-heterocyclic carbene (tetra-NHC) ligands via in situ transmetalation is described. The ruthenium complexes show differing coordination geometries depending on the length of the alkyl linker. Replacement of the two cis acetonitrile ligands in the methylene bridged ruthenium complex by nucleophiles also influences the coordination geometry. Both structural motifs were evaluated in transfer hydrogenation (TH) of acetophenone, and in particular the sawhorse-Type coordinated system exhibits remarkable activity with turnover frequencies of more than 100â"000 h-1.

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JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 12

ER -

Controlling Coordination Geometries: Ru-Carbene Complexes with Tetra-NHC Ligands

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