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  • 1
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    Academy of Sciences
    In:  New York, Academy of Sciences, vol. 558, no. XVI:, pp. 1-14, (ISBN 3-9808493-1-7)
    Publication Date: 1989
    Keywords: Seismology ; Seismicity ; Earthquake hazard
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  • 2
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Установлено повышение дисперсности, а также активности и селективности в синтезе метанола (Pd+Ce)/SiO2 катализаторов, полуенных разложением металлоорганических комплексов Ce и Pd, по сравнению с Pd/SiO2.
    Notes: Abstract (Pd+Ce)/SiO2 catalysts prepared by decomposition of organometallic complexes of Ce and Pd have higher activity, dispersity and selectivity in methanol synthesis than Pd/SiO2 catalysts.
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Alkyl Compounds. XL. About Lithium Alkenylmanganates(II)MnCl2 reacts with vinyl, 2,2-dimethylvinyl, allyl, and methallyl lithium giving rise to alkenyl manganates(II). In a pure state the compounds Li2[Mn(CH=CH2)4] · 1.5 diox, Li2[Mn(CH=C(CH3)2)4] · 1.5 diox, Li2[Mn(CH2—CH=CH2)4] · 2.5 diox and Li3[Mn(CH2—C(CH3)=CH2)5] · 2 diox were isolated.The compounds were characterized by elementary analysis, EPR and IR spectra, magnetic moments, and reactions with iodine.
    Notes: MnCl2 reagiert mit Vinyl-, 2,2-Dimethylvinyl-, Allyl- und Methallyllithium zu Alkenylmanganaten(II). In reiner Form wurden die Verbindungen Li2[Mn(CH=CH2)4] · 1,5 diox, Li2[Mn(CH=C(CH3)2)4] · 1,5 diox, Li2[Mn(CH2—CH=CH2)4] · 2,5 diox und Li3[Mn(CH2—C(CH3)=CH2)5] · 2 diox isoliert.Die Charakterisierung der Verbindungen erfolgte durch Elementaranalysen, ESR- und IR-Spektren, Ermittlung der magnetischen Momente und Reaktionen mit Iod.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen 51. Darstellung und Charakterisierung der Organomangan (III)- Verbindung Na[Mn(C5H5)4]Bei der Reaktion von Mn(acac)3 mit NaC5H5 in Tetrahydrofuran entsteht kristallines, rotviolettes, diamagnetisches Na[Mn(η1-C5H5)4-n(η5 -C5H5)n]. Eine nähere Charakterisierung erfolgte durch das 1H-NMR-, IR- und UV-VIS-Spektrum sowie durch Leitfähigkeitsmessngen.
    Notes: At reaction of Mn(acac)3 with NaC5H5 in tetrahydrofuran solution Na[Mn(η1-C5H5)4-n(η5 -C5H5)n] was obtained as a crystalline, red-violet, diamagnetic organomanganese(III) compound, which was characterized by n.m.r., i.r., and electronic spectra and by conductivity measurements.
    Additional Material: 1 Tab.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Ammonium Pentanitrato Praseodymate and Neodymate(NH4)2[Pr(NO3)5] · 4 H2O (I) and (NH4)2[Nd(NO3)5] · 4 H2O (II) were obtained from Pr6O11 and Nd2O3 by reaction with nitric acid and NH4NO3. The fixed water molecules could be removed completely with formation of [NH4]2[Pr(NO3)5] (III) and [NH4]2[Nd(NO3)5] (IV). The i.r. spectra indicate only symmetrically bonded bidentate NO3- ligands. The water molecules are bonded as well by hydrogen bridges to NH4+ ions as by EDA interaction to the lanthanoid atoms. Therefore, the constitution of the complexes is described more exactly by the formula [NH4]2[Ln(NO3)5(H2O)2] · 2 H2O.
    Notes: (NH4)2[Pr(NO3)5] · 4 H2O (I) und (NH4)2[Nd(NO3)5] · 4 H2O (II) lassen sich durch Umsetzung von Pr6O11 bzw. Nd2O3 mit Salpetersäure und Ammoniumnitrat erhalten. Beide Komplexe ließen sich vollständig dehydratisieren unter Bildung von [NH4]2[Pr(NO3)5] (III) bzw. [NH4]2[Nd(NO3)5] (IV). Die Auswertung der IR-Spektren zeigt, daß in den Komplexen ausschließlich zweizähnig gebundene Nitratliganden vorliegen. I und II enthalten unterschiedlich gebundene Wassermoleküle, die teils über Wasserstoffbrücken an die NH4-Ionen, teils koordinativ an die Lanthanoidatome gebunden sind. Die Konstitution dieser Komplexe wird deshalb exakter durch die Formel [NH4]2[Ln(NO3)5(H2O)2] · 2 H2O beschrieben.
    Additional Material: 1 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to Organolanthanide Chemistry. I. Synthesis and Characterization of Organolanthanide Complexes of Na[Ln(C5H5)4] · nTHF TypeNa[La(C5H5)4] · THF (I) and Na[Pr(C5H5)4] (II) were synthesized from the anhydrous lanthanide chlorides and C5H5Na. Na[Ce(C5H5)4] · THF (III) and Na[Nd(C5H5)4] · THF (IV) were obtained from C5H5Na and (NH4)2[Ce(NO3)6] or (NH4)2[Nd(NO3)5], respectively. The compounds were characterized by elementary analysis, magnetic moments, i.r., 1H- and 13C-n.m.r. spectra, and conductivity measurements. The constitution of I-IV corresponds to the formula [(π-C5H5)3Ln(μ-σ-C5H5)Na(THF)n] (n = 0, 1).In reactions of III with selected organyl, acyl, and organometal halides the σ-bonded C5H5 group is transferred to the substrate.
    Notes: Na[La(C5H5)4]. THF (I) und Na[Pr(C5H5)4] (II) wurden durch Reaktion von wasserfreiem LaCl3 bzw. PrCl3 und Na[Ce(C5H5)4] · THF (III) sowie Na[Nd(C5H5)4] · THF (IV) durch Umsetzung der wasserfreien Nitratokomplexe (NH4)2[Ce(NO3)6] bzw. (NH4)2[Nd(NO3)5] mit C5H5Na hergestellt. Die Verbindungen wurden durch Elementaranalysen, ihre magnetischen Momente, IR-, 1H- und 13C-NMR-Spektren und durch Leitfähigkeitsmessungen charakterisiert. Danach kann die Konstitution von I-IV am besten durch die Formel [(π-C5H5)3Ln(μ-σ-C5H5)Na(THF)n] (n = 0, 1) beschrieben werden.Bei Reaktionen von III mit ausgewählten Organyl-, Acyl- und Organometallhalogeniden wird die σ-gebundene C5H5-Gruppe auf das jeweilige Substrat übertragen.
    Additional Material: 2 Ill.
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  • 7
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thermodynamic properties of ternary compounds, cuprous and cupric chromites (CuCro2, CuCr2O4), and oxygen potentials corresponding to three three-phase regions in the Cu-Cr-O system have been measured in the temperature range 900 to 1350 K using a solid state galvanic cell incorporating calcia-stabilized zirconia. Cuprous chromite was found to be nearly stoichiometric. The compositions of non-stoichiometric cupric chromite saturated with CuO and Cr2O3 have been determined using electron microprobe and energy dispersive X-ray analysis. The results of this study resolve discrepancies in Gibbs' energies of cuprous and cupric chromites reported in the literature. A ternary phase diagram for the Cu-Cr-O system at 1150 K and phase relations in air for the Cu2O-CuO-Cr2O3 system as a function of temperature have been derived based on the new thermodynamic data. The phase diagram given in the literature is found to be inaccurate.
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  • 9
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An e.m.f. technique is used for the measurement of the Gibbs' energy changes involved in the conversion of the rare earth oxysulphides to the corresponding sesquisulphides in the temperature range 870 to 1120 K. The cell arrangement is Au, Ag + Ag2S‖R2O2S + R2S3 ‖‖ (Y2O3)ThO2 ‖‖ Fe + Fe0.95O, Au where R = La, Pr, Nd, Sm, Eu and Gd. Yttria-doped thoria is used as the solid electrolyte because it has predominant ionic conduction at the low oxygen potentials developed at the R2O2S + R2S3 electrode, especially for systems containing heavier rare earth elements. The sulphur potential at the left-hand electrode is established by the dissociation of Ag2S to silver in a closed system. The changes in the standard free energy, enthalpy and entropy associated with the conversion of the rare earth oxysulphide to the sesquisulphide all show a smooth variation with rare earth atomic number. Based on these empirical trends, the corresponding thermodynamic functions for terbium, dysprosium and holmium systems are estimated. The measured free energy values are combined with recent data on the standard free energies of formation of the rare earth oxysulphides to obtain the Gibbs' energies of formation of the corresponding sesquisulphides.
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  • 10
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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