Synthesis and structural characterisation of 'solvent-free' lithium-calcium hexamethyldisilazide, [Li{mu-N(SiMe3)(2)}(2)Ca{N(SiMe3)(2)}], exhibiting a double ration of agostic H3C center dot center dot center dot Li and H3C center dot center dot center dot Ca intramolecular interactions

A.R. Kennedy, R.E. Mulvey, R.B. Rowlings

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Addition of lithium hexamethyldisilazide to an equimolar amount of calcium bis(hexamethyldisilazide) in toluene gave 'solvent-free'. [Li{mu-N(SiMc(3))(2)}(2)Ca{N(SiMe3)(2)] (1). An X-ray study reveals a dinuclear arrangement based on a planar LiNCaN four-membered ring: both metals engage in additional H3C...M (where M = Lt. Ca) interactions with the mu-N(SiMe3)(2) substituents resulting in a distorted tetrahedral geometry at lithium and a distorted trigonal-bipyramidal geometry at calcium. This contrasts with the previously reported mixed Li-Mg analogue, [Li{mu-N(SiMe3)(2)}(2)Mg{N(SiMe3)(2)}], where only the lithium centre engages in such intramolecular agostic H3C...Li interactions.
Original languageEnglish
Pages (from-to)288-292
Number of pages4
JournalJournal of Organometallic Chemistry
Volume648
Issue number1-2
DOIs
Publication statusPublished - 2 Apr 2002

Keywords

  • agostic
  • amide calcium
  • heterometallic
  • intramolecular interactions

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