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  • 1
    ISSN: 0044-2313
    Keywords: Dianionic Polyolato Ligands ; Deprotonated Anhydroerythritol ; Beryllium ; Lead ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyol Metal Complexes. XIII. Na2[Be(C4H6O3)2] · 5H2O and Na2[Pb(C4H6O3)2] · 3H2O - Two Homoleptic Bis Polyolato Metallates with Beryllium and with LeadNa2[Be(C4H6O3)2] · 5H2O (1) and Na2[Pb(C4H6O3)2] · 3H2O (2) crystallize from concentrated, alkaline aqueous solutions. The polyol anhydroerythritol is deprotonated twice in the mononuclear, homoleptic complex anions. The preference of beryllium for the binding of cis-furanoid diols is shown. In 2, a stereochemically active lone pair at the central atom is the reason for the construction of low dimensional aggregates from three plumbate and three sodium ions.
    Notes: Na2[Be(C4H6O3)2] · 5H2O (1) und Na2[Pb(C4H6O3)2] · 3H2O (2) kristallisieren aus konzentrierten wäßrig-alkalischen Lösungen. In den einkernigen, homoleptischen Komplexanionen liegt das Polyol Anhydroerythrit als doppelt deprotonierter Chelatligand vor. Die Präferenz des Berylliums für cis-furanoide Diole wird gezeigt. In 2 führt ein stereochemisch aktives Elektronenpaar am Zentralmetall zum Aufbau eines niederdimensionalen Aggregats aus drei Plumbat- und drei Natrium-Ionen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1496-1498 
    ISSN: 0044-2313
    Keywords: Guanosine ; Ribofuranoside Ligands ; Antimonate(III) ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyol Metal Complexes. 27. Bis-Diolato Antimonates(III) with Guanosine as the DiolThe complex anions of K3[SbIII(Guo1,2′,3′H-3)2] · 10 H2O (1) and [Co(NH3)6][SbIII(Guo1,2′,3′H-3)2] · 9 H2O (2) are four-coordinate homoleptic bis(diolato)antimonate(III) species. The guanosine trianions act as carbohydrate ligands through their cis-furanoidic ribosyl moiety, thus forming no nucleobase-metal bonds.
    Additional Material: 1 Ill.
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  • 3
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Four- and Five-membered Phosphorus Heterocycles, 57. Phosphazene/Azaphosphetidine Tautomerism of 3,3′-Spirobi[ 1,2,4,3λ5-triazaphosphole] DerivativesDifferent routes lead from N1-methylbenzamidrazone (1) and PCl5 to the spirobi[triazaphosphole] 5. Its halogeno-phosphino, -phosphoryl, and -phosphonio derivatives 7 and 9 are prepared by substitution. By an intramolecular addition to the phosphazene bond they isomerize (partly within an observable equilibrium) to the tricyclic halogeno-diazadiphospheto-bis(triazaphospholes) 8, 10, 11. From chloro derivative 8i the corresponding amines, hydrazines, and hydrazones 13 are obtained. Their bridgehead phosphorus is five-fold N-coordinated (in most other cases pentaaminophosphoranes are unstable).
    Notes: Aus N1-Methylbenzamidrazon (1) und PCl5 entsteht auf verschiedenen Wegen das Spirobi[triazaphosphol] 5. Durch Substitution daraus dargestellte Halogen-phosphino-, -phosphoryl- und -phosphonio-Derivate 7 und 9 gehen (z. T. im Rahmen eines beobachtbaren Gleichgewichts) durch intramolekulare Addition an die Phosphazenbindung in die tricyclischen Halogen-diazadiphospheto-bis(triazaphosphole) 8, 10, 11 über. Die Chlorverbindung 8i läßt sich in die entsprechenden Amine, Hydrazine und Hydrazone 13 überführen, in denen der Brückenkopf-Phosphor fünffach N-koordiniert ist.
    Additional Material: 1 Ill.
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