A new, flexible n,n,n-tripodal facially capping ligand system: synthesis and structural characterization of beta-triketimines and their m(co)(3) complexes (m = cr, mo, w)

Barnes, D. and Brown, G.L. and Brownhill, M. and German, I. and Herbert, C.J. and Jolleys, A. and Kennedy, A.R. and Liu, B. (2009) A new, flexible n,n,n-tripodal facially capping ligand system: synthesis and structural characterization of beta-triketimines and their m(co)(3) complexes (m = cr, mo, w). European Journal of Inorganic Chemistry (9). pp. 1219-1233. ISSN 1434-1948 (http://dx.doi.org/10.1002/ejic.200801022)

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Abstract

Reaction of imidoyl chlorides Ar*N=CCIR (Ar* = 2-iPrC(6)H(4), 2,6-iPr(2)C(6)H(3), 2-MeOC6H4; R = Me, Ph, tBu) with [Li(nacnac)] [nacnac = (Ar*NCMe)(2)CH] gives beta-triketimines L, most of which exist in solution in equilibrium with their imine/enamine tautomers. The route is highly modular, allowing independent variation of at least five parameters. The solution equilibria are very sensitive to such substituent pattern variation. Single-crystal X-ray diffraction analyses of examples of both tautomers and a geometric isomer in the solid state are presented, alongside solution NMR studies of the tautomerism. All examples revert exclusively to the beta-triimine form on complexation with M(CO)(3) fragments (M = Cr, Mo, W). Facial isomers result. The ligands are weak sigma-donors, as adjudged by CO IR stretching frequencies in [LM(CO)(3)], Crystal-structure determination on the isostructural pair [HC(2-iPrC(6)H(4)N=CMe)(3)M(CO)(3)] (M = Cr, Mo) revealed a hexagonal packing arrangement composed of aryl-aryl and carbonyl (CO)-H-C interactions which generates pseudocylindrical voids accounting for 6-9 % of the crystal volume. In only one case were these occupied by solvent molecules, This family of facially capping N,N,N-ligands with finely tunable bulk have wide potential in coordination chemistry.

ORCID iDs

Barnes, D., Brown, G.L., Brownhill, M., German, I., Herbert, C.J., Jolleys, A., Kennedy, A.R. ORCID logoORCID: https://orcid.org/0000-0003-3652-6015 and Liu, B.;
  • Item type:Article
    ID code:19223
    Dates:
    Date
    Event
    March 2009
    Published
    Notes:Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Strathclyde Business School > Marketing
    Depositing user: Strathprints Administrator
    Date deposited:08 Jun 2010 13:47
    Last modified:11 Nov 2024 09:24
    URI:https://strathprints.strath.ac.uk/id/eprint/19223
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