Donor-stabilized silyl cations. 5. Comparison between mono- and binuclear siliconium chelates

Inna Kalikhman, Vijeyakumar Kingston, Boris Gostevskii, Vadim Pestunovich, Dietmar Stalke, Bernhard Walfort, Daniel Kost

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Binuclear hexacoordinate silicon chelates have been prepared and shown to have octahedral structure by X-ray crystallography. Their ionization in CD2Cl2 solution has been studied by 29Si NMR spectroscopy. Only one Si-Cl bond in 5a-c ionizes at low temperature to form the monosiliconium bis-chelates 11a-c. Use of a more acidic solvent, CHFCl2, facilitated the second ionization step to the disiliconium dichloride 12c. Replacement of the chloro ligands by better leaving groups (triflate, bromide, or iodide) caused complete ionization (7a-c, 8c, 9c) at room temperature. Crystal structure analyses of the binuclear siliconium triflates 7a,b show a square-pyramid geometry around the silicon atoms, with the ethylene bridge at the apex.

Original languageEnglish
Pages (from-to)4468-4474
Number of pages7
JournalOrganometallics
Volume21
Issue number21
DOIs
StatePublished - 14 Oct 2002

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