7-azaindol-1-yl(organo)silanes and their PdCl2 complexes: Pd-capped tetrahedral silicon coordination spheres and paddlewheels with a Pd-Si axis

Wahlicht S, Brendler E, Heine T, Zhechkov L, Wagler J (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Organometallics American Chemical Society

Book Volume: 33

Pages Range: 2479-2488

Journal Issue: 10

DOI: 10.1021/om401220m

Abstract

Supported by excess triethylamine, 7-azaindole (HL) and dichlorodimethylsilane (Me2SiCl2), methyltrichlorosilane (MeSiCl3), and tetrachlorosilane (SiCl4) react, respectively, with formation of the 7-azaindol-1-yl-substituted silanes Me 2SiL2, MeSiL3, and SiL4. In these compounds the silicon atom adopts [4+2], [4+3], and [4+4] coordination, respectively, with the pyridine N atoms of the 7-azaindol-1-yl groups capping the tetrahedral Si coordination sphere from distances of >3 Å. Two pyridine nitrogen atoms of these silanes replace the acetonitrile ligands of [PdCl2(NCMe)2], thus forming the complexes Me 2Si(μ-L)2PdCl2, MeSiL(μ-L) 2PdCl2, and SiL2(μ-L)2PdCl 2. In addition to capping of the silicon coordination sphere by the pyridine N atoms of the dangling 7-azaindol-1-yl groups (in MeSiL(μ-L) 2PdCl2 and SiL2(μ-L)2PdCl 2), these three palladium complexes exhibit capping of one tetrahedral face of the Si coordination sphere by the palladium atom (with Si···Pd separations of 3.34, 3.43, and 3.31 Å, respectively). According to computational analyses, the paddlewheel complex ClSi(μ-L)4PdCl should be energetically favored over its isomer SiL2(μ-L)2PdCl2; however, isomerization into this paddlewheel compound requires higher temperatures (150 °C) or the addition of a Lewis acid (such as GaCl3). © 2014 American Chemical Society.

Involved external institutions

Technische Universität Bergakademie Freiberg DE Germany (DE) Jacobs University Bremen gGmbH DE Germany (DE)

How to cite

APA:

Wahlicht, S., Brendler, E., Heine, T., Zhechkov, L., & Wagler, J. (2014). 7-azaindol-1-yl(organo)silanes and their PdCl2 complexes: Pd-capped tetrahedral silicon coordination spheres and paddlewheels with a Pd-Si axis. Organometallics, 33(10), 2479-2488. https://doi.org/10.1021/om401220m

MLA:

Wahlicht, Sven, et al. "7-azaindol-1-yl(organo)silanes and their PdCl2 complexes: Pd-capped tetrahedral silicon coordination spheres and paddlewheels with a Pd-Si axis." Organometallics 33.10 (2014): 2479-2488.

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