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

Sven Wahlicht, Erica Brendler, Thomas Heine, Lyuben Zhechkov, Jörg Wagler

Research output: Contribution to journalArticle

11 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)2479-2488
Number of pages10
JournalOrganometallics
Volume33
Issue number10
DOIs
Publication statusPublished - 2014 May 27

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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