Browsing by Author "Smith J.D."

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    Attachment to manganese or cobalt of a bulky tri(organosilyl)methly ligand containing an NME2 or an OMe donor group
    (2002) Al-Juaid S.S.; Eaborn C.; El-Hamruni S.M.; Hitchcock P.B.; Smith J.D.; Sözerli Can S.E.
    The organolithium compound Li(THF)2{C(SiMe3) 2(SiMe2NMe2)} reacted with one equivalent of MnCl2 to give (4) and with 0.5 equivalent of MnCl2 to give Mn{C(SiMe3)2(SiMe2NMe2)}2 together with a small amount of the MnIII compound [Mn(μ-O){C(SiMe3)2 (SiMe2NMe2)}]2 (6) formed by adventitious admission of air. With CoBr2, the compound [Co(μ-Br){C(SiMe3)2(SiMe2NMe2)}]2 (7) was obtained. The reaction between the lithium compound Li(THF)2{C(SiMe3)2(SiMe2OMe)} and MnCl2 in THF gave [Mn(THF)(μ-Cl){C(SiMe3)2 (SiMe2OMe)}]2 (5). The crystal structures of compounds 4, 5, 6 and 7 were determined. Compounds 4 and 5 are the first manganese analogues of Grignard reagents containing Mn-C σ-bonds to be characterised in the solid state. © 2002 Elsevier Science B.V. All rights reserved.
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    Metal complexes of guanidine-substituted alkyl ligands: An unsolvated monomeric two-coordinate organolithium
    (2007) Coles M.P.; Sözerli S.E.; Smith J.D.; Hitchcock P.B.
    Single-crystal X-ray diffraction of MC(SiMe3) 2(SiMe2hpp) (M = Li, K; hppH = 1,3,4,6,7,8,-hexahydro-2H- pyrimido[1,2-a]pyrimidine) showed nonsolvated organometallic compounds in which the iminonitrogen of the guanidine forms strong intramolecular bonds to generate six-membered metallacycles. © 2007 American Chemical Society.
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    An ether-free, internally coordinated dialkylcalcium(II) complex
    (2009) Coles M.P.; Sözerli S.E.; Smith J.D.; Hitchcock P.B.; Day I.J.
    The alkylpotassium compound KCfSiMe 3} 2{SiMe 2hpp} (hppH = l,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) reacts with a slurry of Cal 2 in toluene to give the internallycoordinated dialkylcalcium(II) complex Ca( C{SiMe 3} 2{SiMe 2hpp] ) 2. The molecular structure in the solid state shows short Ca - N and long Ca - C bonds and a wide C - Ca - C angle. The H and 13C NMR spectra suggest that the metallacycle is transiently opened in toluene at room temperature. © 2009 American Chemical Society.
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    Tin and mercury compounds supported by a bulky organometallic ligand incorporating a pendant guanidine functionality
    (CSIRO, 2014) El-Hamruni S.M.; Sözerli S.E.; Smith J.D.; Coles M.P.; Hitchcock P.B.
    The structure of a triclinic form of the organolithium derivative LiR, R≤C(SiMe3)2(SiMe2{hpp}) (1) (hppH≤1,3,4,6,7,8,-hexahydro-2H-pyrimido[1,2- a]pyrimidine) comprises dimers [1]2 held together by Li··· H3C interactions like those in the polymeric structure [1]∞ of the previously described orthorhombic form. Compound 1 reacts with the chlorides MCl2 (M≤Hg or Sn) to give compounds HgRCl (2) or SnRCl (3), which have been characterised by NMR spectroscopy and X-ray crystallography. The structural parameters and conformations of the metallacycles MRLn are compared with those in related compounds containing bulky organosilicon ligands with pendant nitrogen donors. Compound 3 reacts with Li[P{H}Ar*] (Ar*≤2,4,6- tBu3C6H2) to give the crowded phosphanide SnR(P{H}Ar*) (4). © CSIRO 2014.