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Berlin Brandenburg

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  • 1
    Language: English
    In: Inorganic chemistry, 04 April 2011, Vol.50(7), pp.2870-7
    Description: Two series of Schiff base metal complexes were investigated, where each series was supported by an ancillary ligand incorporating a ferrocene backbone and different N=X functionalities. One ligand is based on an imine, while the other is based on an iminophosphorane group. Cerium(IV), cerium(III), and yttrium(III) alkoxide complexes supported by the two ligands were synthesized. All metal complexes were characterized by cyclic voltammetry. Additionally, NMR, Mössbauer, X-ray absorption near-edge structure (XANES), and absorption spectroscopies were used. The experimental data indicate that iron remains in the +2 oxidation state and that cerium(IV) does not engage in a redox behavior with the ancillary ligand.
    Keywords: Cerium -- Chemistry ; Chelating Agents -- Chemistry ; Ferrous Compounds -- Chemistry ; Organometallic Compounds -- Chemistry ; Oxides -- Chemistry ; Yttrium -- Chemistry
    ISSN: 00201669
    E-ISSN: 1520-510X
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  • 2
    Language: English
    In: Journal of the American Chemical Society, 22 June 2011, Vol.133(24), pp.9278-81
    Description: The activity of an yttrium alkoxide complex supported by a ferrocene-based ligand was controlled using redox reagents during the ring-opening polymerization of L-lactide. The oxidized complex was characterized by X-ray crystallography and (1)H NMR, XANES, and Mössbauer spectroscopy. Switching in situ between the oxidized and reduced yttrium complexes resulted in a change in the rate of polymerization of L-lactide. Synthesized polymers were analyzed by gel permeation chromatography. Polymerization of trimethylene carbonate was also performed with the reduced and oxidized forms of an indium alkoxide complex. The indium system showed the opposite behavior to that of yttrium, revealing a metal-based dependency on the rate of polymerization.
    Keywords: Mossbauer Spectroscopy -- Usage ; Oxidation-reduction Reactions -- Analysis ; Ring-opening Polymerization -- Analysis ; X-ray Crystallography -- Usage ; Yttrium Compounds -- Chemical Properties ; Yttrium Compounds -- Structure;
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 3
    Language: English
    In: Journal of the American Chemical Society, 23 March 2011, Vol.133(11), pp.3824-7
    Description: The four-coordinate iron(II) phosphoraniminato complex PhB(MesIm)(3)Fe-N═PPh(3) undergoes an S = 0 to S = 2 spin transition with T(C) = 81 K, as determined by variable-temperature magnetic measurements and Mössbauer spectroscopy. Variable-temperature single-crystal X-ray diffraction revealed that the S = 0 to S = 2 transition is associated with an increase in the Fe-C and Fe-N bond distances and a decrease in the N-P bond distance. These structural changes have been interpreted in terms of electronic structure theory.
    Keywords: Chemistry;
    ISSN: 00027863
    E-ISSN: 1520-5126
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