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  • 1
    Electronic Resource
    Electronic Resource
    The early stages of the sol-gel processing of TEOS (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 51-56 
    Details
    ISSN: 1573-4846
    Keywords: precursor chemistry ; hydrolysis ; development of the sol structure ; 29Si NMR ; molybdate method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reactivity of tetraethoxysilane (TEOS) used in many sol-gel syntheses can be increased by prehydrolysis. In contrast to one-step prehydrolysis acidic two-step prehydrolysis causes an increase of the reactivity of the low molecular species provided the total water/TEOS ratios are the same in both cases. By choice of the processing conditions of the hydrolysis—shown on variation of water content, hydrolysis steps and heat treatment—the degree of condensation, the ratio of hydrolyzable (-OC2H5) and hydrolyzed groups (-OH) and the structure of the low molecular species (short chains, 3-membered and 4-membered rings) can be influenced systematically. The development of the building units formed in the early reaction stages is ascertained by molybdate method and 29Si NMR measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486212
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  • 2
    Electronic Resource
    Electronic Resource
    13C-CP/MAS-NMR spectroscopy of tridentate diacidic ligands and their titanium(IV) chelates. molecular structure of bis[benzoylacetone thiobenzoylhydrazonato(2-)]titanium(iv) (1997)
    Springer
    Structural chemistry 8 (1997), S. 211-216 
    Details
    ISSN: 1572-9001
    Keywords: Titanium(IV) chelates ; tridentate diacidic ligands ; donor set ONO(S) ; 13C-CP/MAS-NMR spectra ; crystal structure of bis[benzoylacetone thiobenzoylhydrazonato(2-)]titanium(IV)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of tridentate diacidic ligands having the donor set ONO(S) as well as the corresponding titanium(IV) chelates were studied by13C-CP/MAS-NMR spectroscopy. Structural changes caused by the complex formation are discussed. The crystal structure of bis[benzoylacetone thiobenzo-ylhydrazonato(2-)]titanium(IV) was determined by X-ray analysis as to be distorted trigonal prismatic. Orthorhombic space group Pca2l,Z=4, 3304 observed independent reflections, unit-cell parameters at 298 K:a=22,808(2) å,b=13,073(4) å,c=10,450(4) å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263509
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