Transition Metal Carbonyl Complexes of an N-Heterocyclic Carbene Stabilized Silyliumylidene Ion

Philipp Frisch; Tibor Szilvási; Amelie Porzelt; Shigeyoshi Inoue

doi:10.1021/acs.inorgchem.9b02772

Transition Metal Carbonyl Complexes of an N-Heterocyclic Carbene Stabilized Silyliumylidene Ion

Inorg Chem. 2019 Nov 4;58(21):14931-14937. doi: 10.1021/acs.inorgchem.9b02772. Epub 2019 Oct 22.

Authors

Philipp Frisch¹, Tibor Szilvási², Amelie Porzelt¹, Shigeyoshi Inoue¹

Affiliations

¹ Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstraße 4 , 85748 Garching bei München , Germany.
² Department of Chemical and Biological Engineering , University of Wisconsin-Madison , 1415 Engineering Drive , Madison , Wisconsin 53706-1607 , United States.

PMID: 31638778
DOI: 10.1021/acs.inorgchem.9b02772

Abstract

Silyliumylidene ions-Si(II) cations with a stereochemically active lone pair of electrons-can act as ligands in transition metal complexes comparable to silylenes. However, no investigations concerning their donor abilities have been carried out. Carbonyl complexes lend themselves exceptionally well to determine the donor/acceptor strength of various ligand systems. We now report the synthesis of novel group 6 and group 8 transition metal carbonyl complexes 2-5 of N-heterocyclic carbene (NHC) stabilized silyliumylidene ion 1b, including the first Cr, Mo, and Fe complexes of a Si(II) cation. The complexes were fully characterized by multinuclear NMR and IR spectroscopy and SC-XRD studies. A combination of experimentally determined IR bands together with theoretical calculations revealed weak σ-donor properties and a negligible π-acceptor ability of NHC-stabilized Si(II) cation 1b.