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

Kennedy, A.R. and Mulvey, R.E. and Rowlings, R.B. (2002) 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. Journal of Organometallic Chemistry, 648 (1-2). pp. 288-292. ISSN 0022-328X (http://dx.doi.org/10.1016/S0022-328X(01)01480-2)

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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.

ORCID iDs

Kennedy, A.R. ORCID logoORCID: https://orcid.org/0000-0003-3652-6015, Mulvey, R.E. ORCID logoORCID: https://orcid.org/0000-0002-1015-2564 and Rowlings, R.B.;
  • Item type:Article
    ID code:601
    Dates:
    Date
    Event
    2 April 2002
    Published
    Keywords:agostic, amide calcium, heterometallic, intramolecular interactions, Chemistry, Materials Chemistry, Biochemistry, Organic Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Mr Derek Boyle
    Date deposited:22 Mar 2006
    Last modified:04 Jun 2021 02:19
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/601
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