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  • 1
    Electronic Resource
    Electronic Resource
    Metal-hydroxycarboxylate interactions: syntheses and structures of K2[VO2(C6H6O7)]2·4H2O and (NH4)2[VO2(C6H6O7)]2·2H2O (1995)
    Springer
    Journal of chemical crystallography 25 (1995), S. 807-811 
    Details
    ISSN: 1572-8854
    Keywords: Citric acid ; citrate complex ; oxovanadium(V) complex ; vanadate ; molecular structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Potassium and ammonium dimeric (citrato)dioxovanadium(V) hydrate K2[VO2(H2cit)]2·4H2O1 and (NH4)2[VO2(H2cit)]2·2H2O2 (H4cit=citric acid) have been prepared and characterized by X-ray structure analyses. Vanadate1 crystallizes in the monoclinic space groupP21/n (No. 14) with unit cell parameters:a=9.304(2),b=11.756(2),c=11.911(2)Å, β=111.72(3)°, andD c=1.911 g/cm3,Z=2; Vanadate2 also crystallizes in the monoclinic space groupP21/n with unit cell parameters:a=9.719(2),b=11.111(3),c=11.294(2)Å, β=109.03(2)°, andD c=1.781 g/cm3,Z=2. Each dimer contains a centro-symmetric planar four-member V2O2 ring with two exocyclic citrate entities coordinated by the oxygen atoms of the hydroxy-and α-carboxylate ligands, while the other two β-carboxylate groups remain uncomplexed. Principal dimensions of the V−O bonds are 1.986(4)av (hydroxy) and 1.980(3)Å(α-carboxyl) for vanadate1, 1.988(2)av (hydroxy) and 1.974(3)Å(α-carboxyl) for vanadate2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01671075
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  • 2
    Electronic Resource
    Electronic Resource
    Complexation between vanadium(V) and citrate: spectroscopic and structural characterization of a dinuclear vanadium(V) complex (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 605-609 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Investigation of the aqueous coordination chemistry for citrate and vanadium(V) resulted in the isolation and characterization of a dinuclear vanadium(V) citrato complex (1) Na2K2[VO2(Hcit)]2 · 9H2O. Complex (1) is an intermediate between the fully deprotonated and diprotonated citrate vanadate. It may represent an early mobilized precursor in the biosynthesis of FeV-co, as well as a relevant model in the proton transport relay process between P-cluster pair to M-cluster pair. The complex has been characterized by elemental analyses and i.r. spectroscopy. Its i.r. spectra are consistent with a oxo-bridged dinuclear structure as revealed by a single crystal X-ray diffraction study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006947218366
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  • 3
    Electronic Resource
    Electronic Resource
    Oxidative dehydrogenation of propane over a series of low‐temperature rare earth orthovanadate catalysts prepared by the nitrate method (1999)
    Springer
    Catalysis letters 61 (1999), S. 39-44 
    Details
    ISSN: 1572-879X
    Keywords: low‐temperature catalysts ; rare earth orthovanadate catalysts ; oxidative dehydrogenation of propane ; nitrate method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of high‐purity rare earth orthovanadates were prepared by the nitrate method and found to be effective low‐temperature catalysts for the oxydehydrogenation of propane at 320°C, at which no reactions occurred over the catalysts reported in the literature, and, thus, may be of practical significance. The catalytic performances of LnVO4 (Ln = Y, Ce–Yb) at 500°C were much better than those of rare earth orthovanadate catalysts and also slightly exceeded that of magnesium orthovanadate Mg3(VO4)2 reported in the literature. LnVO4 (Ln = Y, Ce–Yb) materials were tetragonal active phases which could stabilize the existence of active sites for the oxydehydrogenation of propane. Some catalysts with a certain amount of LnVO3 reduced from LnVO4 (Ln = Ho–Yb) under reaction atmosphere exhibited better redox properties and catalytic performances possibly due to the existence of biphasic catalytic synergy. LaVO4 was a monoclinic unstable active phase, although its bulk structure did not change after reaction. The remarkable deactivation of the LaVO4 catalyst was probably due to that LaVO4 could not stabilize the existence of surface active sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019096116289
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