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  • 2020-2021
  • 1990-1994  (47)
  • 1950-1954  (11)
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  • 11
    Electronic Resource
    Electronic Resource
    Standard Gibbs' energies of formation of BaCuO2, Y2Cu2O5 and Y2BaCuO5 (1991)
    Springer
    Journal of materials science 26 (1991), S. 3374-3379 
    Details
    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 The Gibbs' energies of formation of BaCuO2, Y2Cu2O5 and Y2BaCuO5 from component oxides have been measured using solid state galvanic cells incorporating CaF2 as the solid electrolyte under pure oxygen at a pressure of 1.01×105 Pa 〈BaO〉 + 〈CuO〉 → 〈BaCuO2〉 ΔG f,ox o (± 0.3) (kJ mol−1)=−63.4−0.0525T(K) 〈Y2O3〉 + 2〈CuO〉 → 〈Y2Cu2O2〉 ΔG f,ox o (± 0.3) (kJ mol−1)=18.47−0.0219T(K) 〈Y2O3〉 + 〈BaO〉 + 〈CuO〉 → 〈Y2BaCuO5〉 ΔG f,ox o (± 0.7) (kJ mol−1)=−72.5−0.0793T(K) Because the superconducting compound YBa2Cu3O7−δ coexists with any two of the phases CuO, BaCuO2 and Y2BaCuO5, the data on BaCuO2 and Y2BaCuO5 obtained in this study provide the basis for the evaluation of the Gibbs' energy of formation of the 1-2-3 compound at high temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01124688
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  • 12
    Electronic Resource
    Electronic Resource
    Microstructural changes induced by ternary additions in a hypo-eutectic titanium-silicon alloy (1991)
    Springer
    Journal of materials science 26 (1991), S. 2637-2644 
    Details
    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 Hypo-eutectic Ti-6.5 wt % Si alloy modified by separate additions of misch metal and low surface tension elements (Na, Sr, Se and Bi) has been examined by microscopic study and thermal analysis. Addition of third element led to modification of microstructure with apparently no significant enhancement of tensile ductility, with the exception of bismuth. Bismuth enhanced the ductility of the alloy by a factor of two and elastic-plastic fracture toughness to 9 MPa m−1/2 from a value of almost zero. The improved ductility of bismuth modified alloy is attributed to the reduced interconnectivity of the eutectic suicide, absence of significant suicide precipitation in the eutectic region and increase in the volume fraction of uniformly distributed dendrites. These changes are accompanied by a decrease in the temperature of eutectic solidification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387731
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  • 13
    Electronic Resource
    Electronic Resource
    Chromatographic methods (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 337 (1990), S. 60-72 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325724
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  • 14
    Electronic Resource
    Electronic Resource
    021 Determination of bile porphyrins by ion-pair high-performance liquid chromatography (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 343 (1992), S. 72-73 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332015
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  • 15
    Electronic Resource
    Electronic Resource
    Über Neurosekretion im Zwischenhirn der Vöge (1952)
    Springer
    Cell & tissue research 36 (1952), S. 556-562 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Im Nucleus supraopticus und paraventricularis des Diencephalon der Vögel spielen sich neurosekretorische Prozesse ab, wie histologische Untersuchungen am Gehirn verschiedener Vogelarten zeigen. Die Ganglienzellen der genannten Kerne bilden teils umfangreichere Kolloidtropfen, teils ein feineres granuläres Sekret. Mit Chromhämatoxylin elektiv färbbares Neurosekret läßt sich im Verlaufe der marklosen Fasern des Tractus hypothalamo-hypophyseus bis zum Hinterlappen der Hypophyse verfolgen. Mit dem nunmehr erbrachten Nachweis der neurosekretorischen hypothalamisch-hypophysären Bahn auch bei den Vögeln ergibt sich, daß dieses System gemeinsamer Besitz aller Wirbeltierklassen ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347687
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  • 16
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von Tribenzylzinn- und TribenzyltitancyclopentadienylProfessor Karl-Heinz Thiele zum 60. Geburtstage am 9. März 1990 gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 581 (1990), S. 33-40 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: About Tribenzyltin- and TribenzyltitaniumcyclopentadienylThe organocerium(III) compound Na(THF)[(π-C5H5)3Ce(σ-C5H5)] (I) reacts with (C6H5CH2)3SnCl and (C6H5CH2)3TiCl after a SN-reaction under separation of Nacl and (C5H5)3Ce to tribenzyltin- resp.-titaniumcyclopentadienyl (C6H5CH2)3MC5H5 [M = Sn, (II); Ti, (III)]. A special characterization of II and III was carried out by their elementary analysis, I.R. spectroscopy and 1H, 13C, and 119Sn N.M.R. spectroscopy. These results allow the statement that II and III are better to be described by the formulae (C6H5CH2)3Sn(σ-C5H5) and (C6H5CH2)3Ti(π-C5H5), respectively.
    Notes: Die Organocer(III)-Verbindung Na(THF)[(π-C5H5)3Ce(σ-C5H5)] (I) reagiert mit (C6H5CH2)3SnCl und (C6H5CH2)3TiCl im Sinne einer SN-Reaktion unter Abscheidung von NaCl und (C5H5)3Ce zu Tribenzylzinn- bzw. -titancyclopentadienyl (C6H5CH2)3MC5H5 [M = Sn, (II); Ti, (III)]. Eine eingehende Charakterisierung von II und III erfolgte durch Elementaranalysen, IR-Spektroskopie sowie durch 1H-, 13C- bzw. 119Sn-NMR-spektroskopische Untersuchungen. Diesbezügliche Resultate gestatten die Aussage, daßII bzw. III durch die Formeln (C6H5CH2)3Sn(σ-C5H5) und (C6H5CH2)3Ti(π-C5H5) zu beschreiben sind.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905810105
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  • 17
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 58. Zur Kenntnis von 2-(Dimethylaminomethyl)ferrocenyl-Verbindungen des Vanadiums, Molybdäns, Wolframs, Thoriums und Urans (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 613 (1992), S. 88-92 
    Details
    ISSN: 0044-2313
    Keywords: Transition metal alkyl compounds ; vanadium ; molybdenum ; tungsten ; thorium ; uranium ; 2-(dimethylaminomethyl)ferrocenyl compounds ; 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. 58 On 2-(Dimethylaminomethyl)ferrocenyl Compounds of Vanadium, Molybdenum, Tungsten, Thorium, and UraniumEarlier results according to which dimethylaminomethylferrocenyl groups (FcN) are able to form stable organometallic chelate compounds were confirmed by synthesis of the heterobimetallic chelate compounds (FcN)2VO · Li(acac) II, (FcN)MoO2(acac) III, (FcN)WOCl3 IV, (FcN)Th(acac)3 V, and (FcN)UO2(acac) VI from the corresponding metal acetylacetonates or oxidchlorides and (FcN)Li I. The new compounds were characterized by elemental analysis, the i.r., 1H-n.m.r., and electron spectra and by their effective magnetic moments.
    Notes: Frühere Befunde, wonach Dimethylaminomethylferrocenyl-Gruppen (FcN) zur Bildung stabiler Organoübergangsmetallchelate befähigt sind, wurden durch die Synthese der heterobimetallischen Chelatkomplexe (FcN)2VO · Li(acac) II, (FcN)MoO2(acac) III, (FcN)WOCl3 IV, (FcN)Th(acac)3 V und (FcN)UO2(acac) VI aus den betreffenden Metalloxidchloriden bzw. -acteylacetonaten und (FcN)Li I bestätigt.  -  Die erhaltenen Verbindungen wurden durch Elementaranalysen, IR-, 1H-NMR- und UV-VIS-Spektren sowie Bestimmung der effektiven magnetischen Momente charakterisiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926130115
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  • 18
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 57. 2-(Dimethylaminomethyl)ferrocenyl-Verbindungen von 3d-ElementenProfessor Rudolf Taube zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 606 (1991), S. 133-139 
    Details
    ISSN: 0044-2313
    Keywords: 2-(Dimethylaminomethyl)ferrocenyl 3 d metal compounds ; preparation ; 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. 57. 2-(Dimethylaminomethyl)ferrocenyl Compounds of 3 d Elements[2-(Dimethylaminomethyl)ferrocenyl]lithium, (FcN)Li (I), reacts with MCl2 · xTHF to (FcN)2Mn (II), (FcN)2Co (III), Li2[Fe(FcN)2Cl2] (IV) as well as with FeCl3 to (FcN)3Fe (V). In the same way the complex (C5H5)2V(FcN) (VI) was obtained from (C5H5)2VCl. When I is reacted with M(acac)3 (M = Cr, Co) only a partial ligand exchange took place  -  independently from the molar ratio of the reactants  -  with formation of (FcN)Cr(acac)2 (VII) and (FcN)Co(acac) (VIII).An intensive characterization of II-VIII was achieved by elementary analysis, determination of molecular weights, IR-, UV-VIS- and 1H-NMR spectra as well as determination of effective magnetic moments.
    Notes: [2-(Dimethylaminomethyl)ferrocenyl]lithium, (FcN)Li (I), reagiert mit MCl2 · xTHF zu (FcN)2Mn (II), (FcN)2Co (III), Li2[Fe(FcN)2Cl2] (IV) sowie mit FeCl3 zu (FcN)3Fe (V). Auf gleiche Weise wurde aus (C5H5)2 VCl der Komplex (C5H5)2V(FcN) (VI) erhalten. Bei der Einwirkung von I auf M(acac)3 (M = Cr, Co) erfolgte unabhängig vom Molverhältnis der Reaktanten nur ein partieller Ligandenaustausch unter Bildung von (FcN)Cr(acac)2 (VII) und (FcN)Co(acac) (VIII).Eine eingehende Charakterisierung von II-VIII erfolgte durch Elementaranalysen, Molmassebestimmungen, IR-, UV-VIS- und 1H-NMR-Spektren sowie Bestimmung der effektiven magnetischen Momente.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916060114
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  • 19
    Electronic Resource
    Electronic Resource
    Über 2-(Dimethylaminomethyl)ferrocenyl-Verbindungen des Vanadiums, Niobs und Tantals (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1489-1493 
    Details
    ISSN: 0044-2313
    Keywords: Organotransition metal chemistry ; heterobimetallic 2-(dimethylaminomethyl)ferrocenyl derivatives of vanadium, niobium, tantalum ; synthesis ; 1H-n.m.r.-, uv-vis spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On 2-(Dimethylaminomethyl)ferrocenyl Compounds of Vanadium, Niobium, and TantalumFormer results, indicating the ability of (dimethylaminomethyl)ferrocenyl groups forming stable σ-organo transition-metal derivatives, were proved by the synthesis of heterobimetallic 2-(dimethylaminomethyl)ferrocenyl compounds of the three-valued vanadium as well as five valued niobium and tantalum from VCl3, NbCl5, TaCl5, and (FcN)Li (I).The synthesis and properties of the compounds (FcN)2VCl (II), (FcN)nNbCl5-n(THF)x [n = 1, x = 1,3 (III); n = 2, x = 0 (IV); n = 3, x = 0 (V)] as well as (FcN)TaCl4(THF)1.5 (VI) are reported. An intensive characterization, especially in respect of possible chelate structures was tried by i.r., 1H-n.m.r., uv-vis, mass spectroscopy, and elementary analysis.
    Notes: Frühere Befunde, wonach (Dimethylaminomethyl)-ferrocenyl-Gruppen (FcN) zur Bildung stabiler σ-Organoübergangsmetall-Derivate befähigt sind, wurden durch die Synthese heterobimetallischer 2-(Dimethylaminomethyl)-ferrocenyl-Verbindungen des dreiwertigen Vanadiums sowie des fünfwertigen Niobs und Tantals aus den Metallchloriden VCl3, MCl5 (M = Nb, Ta) und (FcN)Li (I) bestätigt. Die Darstellung und die Eigenschaften der Verbindungen (FcN)2VCl (II), (FcN)nNbCl5-n(THF)x [n = 1, x = 1,3 (III); n = 2, x = 0 (IV); n = 3, x = 0 (V)] sowie von (FcN)TaCl4 · 1,5 THF (VI) werden mitgeteilt. Eine eingehende Charakterisierung, insbesondere hinsichtlich der Ausbildung möglicher Chelatstrukturen, erfolgte durch IR-, 1H-NMR-, UV-VIS- und Massenspektroskopie sowie durch Elementaranalysen.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200829
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  • 20
    Electronic Resource
    Electronic Resource
    Beiträge zur Lanthanoidchemie. III Zur Kenntnis von 2-(Dimethylaminomethyl)ferrocenyl-Verbindungen des Samariums und Yttriums (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1957-1961 
    Details
    ISSN: 0044-2313
    Keywords: Organolanthanide chemistry, samarium, yttrium ; 2-(dimethylaminomethyl)ferrocenyl compounds ; heterobimetallic organolanthanide chelate complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contribution to Organolanthanoide Chemistry. III. On 2-(Dimethylaminomethyl)ferrocenyl Compounds of Samarium and YttriumEarlier results, indicating the ability of the bulky 2-(dimethylaminomethyl)ferrocenyl-group (FcN) to form thermocally stable, heterobimetallic organolanthanide compounds, were proved by the synthesis of organo-rare-earth derivatives (C5Me5)2Sm(FcN) (II), (C5H5)Sm(FcN)Cl (III), respectively (C5Me5)Y(FcN)Cl (IV) from the corresponding complex cyclopentadienyl rare-earth chlorides (C5Me5)2SmCl · KCl · THF, (C5H5)SmCl2 · THF and (C5Me5)YCl2 · KCl · 1,8 THF and 2-(dimethylaminomethyl)ferrocenyl lithium (FcN)Li (I) as organylating agent. The synthesized compounds were proved by elementary analysis, IR, 1H, 13C NMR and UV-VIS spectra as well as by measuring the magnetic moments and by mass spectroscopy.
    Notes: Frühere Befunde, wonach die voluminöse 2-(Dimethylaminomethyl)ferrocenyl-Gruppierung (FcN) zur Bildung thermisch stabiler, heterobimetallischer Organolanthanoid(III)-Verbindungen befähigt ist, wurden durch die Darstellung der Organoseltenerd(III)-Derivate (C5Me5)2Sm(FcN) (II), (C5H5)Sm(FcN)Cl (III) und (C5Me5)Y(FcN)Cl (IV) aus den betreffenden komplexen Cyclopentadienyl-Seltenerd(III)-chloriden (C5Me5)2SmCl · KCl · THF, (C5H5)SmCl2 · THF bzw. (C5Me5)YCl2 · KCl · 1,8 THF und 2-(Dimethylaminomethyl)ferrocenyl-Lithium (FcN)Li (I) als Organylierungsmittel bestätigt. Die erhaltenen Verbindungen wurden durch Elementaranalysen, IR-, 1H-NMR-, 13C-NMR- und UV-VIS-Spektren sowie durch die Ermittlung der effektiven magnetischen Momente und die Aufnahme der Massenspektren charakterisiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936191122
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