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  • 1
    ISSN: 0947-6539
    Keywords: copper ; cuprates ; cyclodextrins ; structure elucidation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the presence of cupric ions, α-cyclodextrin (α-CD) is multiply deprotonated in alkaline aqueous solution. With lithium or sodium as the counterions, trinuclear sandwich-type cuprate ions of the formula [Cu3(α-CDH_6)2]6- are formed (1 and 2), whereas dinuclear [Cu2(α-CDH_4)2]4- ions are isolated in the form of the potassium (3a) and the rubidium salts (3b). The structures of the cyclodextrinatocuprate ions resemble cylinders, since the usual conical shape of a cyclodextrin is altered due to the formation of shorter hydrogen bonds on the O2/O3 rim of the α-cyclodextrin torus. Despite anion formation, the cavity of the cyclodextrin is still hydrophobic, giving rise to the intercalation of acetone guests in 2 and 3.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-1948
    Keywords: 2,2′-Bipyridines ; Chelate complexes ; Hydrogen bonding ; π-π stacking ; Crystal structure ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new synthetic route for the synthesis of 5,5′-diamino-2,2-bipyridine (5) based on the coupling of 2-chloro-5-aminopyridine in the presence of NiCl2 × 6 H2O/PPh3/Zn in dimethylformamide is described. The reactions of the potentially ambidentate ligand 5 with salts of the transition metals Mn, Fe, Ni, Cu, Zn, Ag, and Cd gave a variety of 13 metal-ligand complexes depending on the anion, the crystallization conditions and the metal-to-ligand ratio. The complexes obtained were characterized by thermal analyses, NMR including 113Cd-NMR, IR, and for the iron complex 57Fe-Mößbauer spectroscopy. The structure of eight of the compounds was elucidated by X-ray crystallography. All of these metal complexes show a bipyridine-metal coordination. The amino functionality was never involved in metal coordination. The intermolecular arrangement is dictated by hydrogen bonding from the amino functionality and by π-π stacking of the bipyridine rings.Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2005/1999/99078_s.pdf or from the author.
    Additional Material: 8 Ill.
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  • 3
    ISSN: 0044-2313
    Keywords: Sodium Tricuprate(II) ; Barium Dicuprate ; Propanetriolato Ligands ; μ-Hydro Ligands ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyol Metal Complexes. 18. Multinuclear Cuprates(II) with deprotonated Glycerol as a ligandNa3[Cu3(GlycH-3)3] · 7H2O(1) and Na3[Cu3(GlycH-3)3] · 1/3NaNO3 · 10H2O (4) (Glyc = glycerol) crystallize from aqueous solutions containing sodium hydroxide. The trinuclear tricuprate(II) ions exhibit Cs-symmetry (approximately for 1). The central Cu3O3 cyclus has an envelope conformation one, of the copper atoms being out of plane. Ba2(ox)[Cu2(μ-OH)2(Glycl, 2H2)2] · 10H2O (2) (ox = oxalate) is formed by oxidation with air from respective solutions containing barium hydroxide.
    Notes: Na3[Cu3(GlycH-3)3] · 7 H2O (1) and Na3[Cu3(GlycH-3)] · 1/3 NaNO3 · 10 H2O (4) (Glyc = Glycerin) kristallisieren aus wäßrig-alkalischer Lösung. Die dreikernigen Tricuprat(II)-Ionen sind (bei 1 angenähert) Cs-symmetrisch, der zentrale Cu3O3-Ring liegt in einer Briefumschlagkonformation mit einem Kupferatom als weggeklappter Ecke vor. Ba2(ox)[Cu2(μ-OH)2(Glycl, 2 H-2)2] · 10 H2O (2) (ox = Oxalat) entsteht durch Luftoxidation aus entsprechenden Lösungen mit Bariumhydroxid.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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