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Molecules 2017, 22(7), 1204; doi:10.3390/molecules22071204

N-Heterocyclic Carbene Coinage Metal Complexes of the Germanium-Rich Metalloid Clusters [Ge9R3] and [Ge9RI2]2 with R = Si(iPr)3 and RI = Si(TMS)3

1
Wacker Institute for Silicon Chemistry and Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany
2
Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany
3
TUM Catalysis Research Center (CRC), Ernst-Otto-Fischer Straße 1, 85747 Garching, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 18 June 2017 / Revised: 14 July 2017 / Accepted: 15 July 2017 / Published: 19 July 2017
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Abstract

We report on the synthesis of novel coinage metal NHC (N-heterocyclic carbene) compounds of the germanium-rich metalloid clusters [Ge9R3] and [Ge9RI2]2 with R = Si(iPr)3 and RI = Si(TMS)3. NHCDippCu{η3Ge9R3} with R = Si(iPr)3 (1) represents a less bulky silyl group-substituted derivative of the known analogous compounds with R = Si(iBu)3 or Si(TMS)3. The coordination of the [NHCDippCu]+ moiety to the cluster unit occurs via one triangular face of the tri-capped trigonal prismatic [Ge9] cluster. Furthermore, a series of novel Zintl cluster coinage metal NHC compounds of the type (NHCM)23Ge9RI2} (RI = Si(TMS)3 M = Cu, Ag and Au; NHC = NHCDipp or NHCMes) is presented. These novel compounds represent a new class of neutral dinuclear Zintl cluster coinage metal NHC compounds, which are obtained either by the stepwise reaction of a suspension of K12Ge17 with Si(TMS)3Cl and the coinage metal carbene complexes NHCMCl (M = Cu, Ag, Au), or via a homogenous reaction using the preformed bis-silylated cluster K2[Ge9(Si(TMS)3)2] and the corresponding NHCMCl (M = Cu, Ag, Au) complex. The molecular structures of NHCDippCu{η3Ge9(Si(iPr)3)3} (1) and (NHCDippCu)23-Ge9(Si(TMS)3)2} (2) were determined by single crystal X-ray diffraction methods. In 2, the coordination of the [NHCDippCu]+ moieties to the cluster unit takes place via both open triangular faces of the [Ge9] entity. Furthermore, all compounds were characterized by means of NMR spectroscopy (1H, 13C, 29Si) and ESI-MS. View Full-Text
Keywords: coinage metal; NHC compounds; Zintl clusters; binuclear compounds coinage metal; NHC compounds; Zintl clusters; binuclear compounds
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MDPI and ACS Style

Geitner, F.S.; Giebel, M.A.; Pöthig, A.; Fässler, T.F. N-Heterocyclic Carbene Coinage Metal Complexes of the Germanium-Rich Metalloid Clusters [Ge9R3] and [Ge9RI2]2 with R = Si(iPr)3 and RI = Si(TMS)3. Molecules 2017, 22, 1204.

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