Solution interaction of potassium and calcium bis(trimethylsilyl)amides; preparation of Ca[N(SiMe 3) 2] 2 from dibenzylcalcium

Adam M. Johns, Stephen C. Chmely, Timothy P. Hanusa

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Abstract

Ca[N(SiMe 3) 2] 2 (1) is isolated in nearly quantitative yield from the room temperature reaction of Ca(CH 2Ph) 2(THF) and HN(SiMe 3) 2 in toluene. A commonly used preparation of 1 involving the reaction of potassium bis(trimethylsilyl)amide, K[N(SiMe 3) 2] (2), with Cal 2 can produce material that contains substantial amounts of potassium, probably in the form of a calciate such as K[Ca{N(SiMe 3) 2} 3]. The favorable formation of K[Ca{N(SiMe 3) 2} 3] from 1 and 2 was confirmed with density functional theory calculations. Deliberate doping of solutions of 1 with 2 initially causes only an upfield shift in the single 1H NMR resonance observed for 1; not until K/Ca ratios exceed 1:1 is the presence of the added potassium obvious by the appearance of an additional peak in the spectrum.

Original languageEnglish (US)
Pages (from-to)1380-1384
Number of pages5
JournalInorganic chemistry
Volume48
Issue number4
DOIs
StatePublished - Feb 16 2009

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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