Browsing by Subject "COORDINATION CHEMISTRY"

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  • Freese, Tyll; Lücke, Ana-Luiza; Schmidt, Catharina A. S.; Polamo, Mika; Nieger, Martin; Namyslo, Jan C.; Schmidt, Andreas (2017)
    The sydnone imines Molsidomine and 5-(benzoylimino)-3-(2-methoxyphenyl)-1,2,3-oxadiazolium-2-ide gave anionic N-heterocyclic carbenes on deprotonation at C4 which were trapped as methylated selenium adducts, gold complexes (X-ray analysis) as well as palladium complexes (X-ray analysis). The C-13 NMR resonance frequencies of the carbene carbon atom are extremely shifted upfield and appear at delta = 142.1 ppm (Molsidomine carbene) and delta = 159.8 ppm (sydnone imine carbene). The Pd complexes were applied as catalysts in Suzuki-Miyaura and Sonogashira-Hagihara cross-coupling reactions. (C) 2017 Elsevier Ltd. All rights reserved.
  • Liu, Ming; Namyslo, Jan C.; Nieger, Martin; Polamo, Mika; Schmidt, Andreas (2016)
    The mesomeric betaine imidazolium-1-ylphenolate forms a borane adduct with tris(pentafluorophenyl) borane by coordination with the phenolate oxygen, whereas its NHC tautomer 1-(2-phenol) imidazol-2-ylidene reacts with (triphenylphosphine) gold(I) chloride to give the cationic NHC complex [Au(NHC)(2)][Cl] by coordination with the carbene carbon atom. The anionic N-heterocyclic carbene 1-(2-phenolate) imidazol-2-ylidene gives the complexes [K][Au(NHC-)(2)], [Rh(NHC-)(3)] and [Ni(NHC-)(2)], respectively. Results of four single crystal analyses are presented.
  • Sunjuk, Mahmoud; Abu-Surrah, Adnan S.; Abu Safieh, Kayed A.; Qaroush, Abdussalam K.; Al-Qaisi, Feda'a M. (2017)
    The synthesis of new palladium(II) complexes of the type [Pd(A-N=C-ph-C=N-A) Cl-2] (4a-e) (A = cyclohexyl (a), 2-isoprpropyl (b), pyrenyl (c), naphthyl (d), and 2,6-diisopropyl (e)) is described. The isolated gamma-diimine ligands and their corresponding palladium(II) complexes were characterized by their physical properties, elemental analysis, H-1 NMR=, C-13 NMR, and infrared spectroscopy. The palladium(II) complexes (4a-e) were employed successfully as catalysts for atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in the presence of ethyl-2-bromoisobutyrate (EBIB) as initiator at 90 degrees C. Polymerization with these catalyst systems afforded polymers with low molecular weight distribution (M-w/M-n) and syndio-rich atactic poly (MMA) with relatively higher [rr] diads. (C) 2013 Production and hosting by Elsevier B.V.
  • Schlindwein, Simon H.; Nieger, Martin; Gudat, Dietrich (2021)
    Reaction of a phosphane-decorated benzenedithiol (pbdtH(2)) with coinage metal salts furnished polynuclear complexes [M-2(pbdtH)(2)] (M=Au-I) or [cat][M-5(pbdt)(3)] (cat=unipositive cation, M=Ag-I, Cu-I), which were characterized by analytical and spectroscopic techniques and single-crystal X-ray diffraction studies. Furthermore, a double salt with an anion [Ag-5(pbdt)(3)(PPh3)](-) that proved unstable in solution was characterized crystallographically. The spectroscopic and crystallographic data revealed that the Cu(I) and Ag(I) complexes exhibit, despite their like stoichiometric composition, isomeric molecular structures. The observed disparities were reproduced by DFT studies. The dinuclear Au(I) complex was found to undergo air-oxidation to furnish a mixed-valent complex [(Au-III)(2)(Au-I)(2)(pbdt)(4)]. The copper(I) - but not the isomeric silver(I) complexes - showed luminescence in the solid state.
  • van den Bos, Eelke D.; Mutikainen, Ilpo; Turpeinen, Urho; van Albada, Gerard A.; Haasnoot, Jaap G.; Reedijk, Jan (2010)