Issue 18, 1993

Solid-state and solution structures of some lithium salts of tetraphenyldisiloxanediolate(2–) and the lithium-bridged compounds Li2[M(OSiPh2OSiPh2O)3·3py](py = pyridine, M = Zr or Hf)

Abstract

The compound [{Si2Ph4O(OLi)2}2·3(C4H8O2)] was formed in a 2 : 1 reaction between n-butyllithium and tetraphenyldisiloxanediol in dioxane and its solid-state structure was determined by single-crystal X-ray diffraction. Variable-temperature 7Li and ambient temperature 29Si NMR studies on [2H8]toluene solutions of this and the related pyridine (py) adduct [Si2Ph4O(OLi)2·2py]2 were carried out. The cyclic hafnasiloxane Li2[[graphic omitted])3]·3py·3C6H6 was isolated from a 3 : 1 reaction between [Si2Ph4O(OLi)2·2thf]2(thf = tetrahydrofuran) and HfCl4 and its structure determined by single-crystal X-ray diffraction. The variable-temperature 7Li NMR spectra of this and the related zirconium compound show that there is rapid exchange between non-equivalent lithium environments. Lithium hopping between available equivalent environments is inferred by the equilibration of the three distinct silicon environments in the structure as seen by 29Si NMR studies.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1993, 2849-2855

Solid-state and solution structures of some lithium salts of tetraphenyldisiloxanediolate(2–) and the lithium-bridged compounds Li2[M(OSiPh2OSiPh2O)3·3py](py = pyridine, M = Zr or Hf)

M. Motevalli, D. Shah and A. C. Sullivan, J. Chem. Soc., Dalton Trans., 1993, 2849 DOI: 10.1039/DT9930002849

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