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  • Chemistry  (18)
  • Analytical Chemistry and Spectroscopy  (2)
  • Free porphyrin carboxylic acids in urine, complete separation  (1)
  • 1985-1989  (11)
  • 1980-1984  (7)
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    High-pressure particulate expansion and minimum bubbling of fine carbon powders (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 1698-1706 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Particulate expansion and minimum bubbling parameters (n, u′t, umB, εmB) are measured for fine carbon powders (dp = 44 and 112 μm) fluidized with synthesis gas (H2/CO = 0.8) at pressures within the range 2,070 〈 P 〈 12,420 kPa in an industrial, pilot-scale fluidized bed. Deviations between minimum bubbling (umB and εmB) and minimum fluidization (umf and εmf) conditions increase with increasing pressure, P. The expansion index, n, decreases with increasing P and always exceeds values recommended by Richardson and Zaki for solid/liquid systems. Particulate bed expansion for the fine powders is well characterized by the equations of Foscolo et al. and Abrahamsen and Geldart. The theory of Foscolo and Gibilaro adequately estimates the onset of bubbling for both powders at all P, provided that experimentally determined values of n and u′t, are applied. For the dp = 112 μm powder, the theory of Foscolo and Gibilaro is applicable with calculated values of ut and experimental values of n.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690331013
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  • 2
    Electronic Resource
    Electronic Resource
    Rapid and simple direct determination of porphyrins in urine by ion-pair reversed-phase high performance liquid chromatography (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 85-86 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Ion-pair reversed-phase ; Free porphyrin carboxylic acids in urine, complete separation ; Quantitation within 4.4-5.4% precision ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030206
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  • 3
    Electronic Resource
    Electronic Resource
    Selected ion monitoring determination of mono- and bifunctional amines by using phosphorus-containing derivativesPresented in parts at the 17th International Symposium on ‘Advances in Chromatography’, Las Vegas, Nevada, USA (1982). (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1983), S. 175-182 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Numerous monofunctional amines have been reacted with dimethylthiophosphinic chloride to form stable derivatives. Their good gas chromatographic properties and abundant molecular ions afforded highly sensitive and specific detection by selected ion monitoring (SIM) down to the picogram level. Based upon this derivatization procedure, new methods for the determination of aniline in serum and urine by SIM were developed. The minimum detectable concentration of aniline was 500 pg ml-1. Linear response curves were obtained from 1.5 to 150 ng ml-1 using (2H5)aniline as the internal standard. Specific derivatization of a series of bifunctional amines was achieved with methyldichlorophosphine and sulfur resulting in the formation of stable phospholidine-thiones. These derivatives chromatograph well on nonpolar stationary phases, and their mass spectra exhibit abundant molecular ions. This derivatization reaction was applied to the quantification of ephedrine from urine and serum by SIM with (2H2)ephedrine as the internal standard. The detection limit of the method was 1 ng ml-1. The linearity was established in the range from 10 to 160 ng ml-1.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200100312
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 53. Darstellung und Eigenschaften von Mangantetravinyloxid, Mn(OCH=CH2)4 · 0,5 THF (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 564 (1988), S. 81-84 
    Details
    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 Organo Transition Metal Compounds. 53. Synthesis and Properties of Manganese Tetravinyloxide, Mn(OCH=CH2)4 · 0.5 THFTetrakis(1-Norbornyl)manganese (I) reacts with boiling tetrahydrofuran forming ethylene, norbornane, and manganese tetravinyloxide Mn(OCH=CH2)4 · 0.5 THF (II) as the first manganese tetraalcoxide. The compound was characterized by elementary analysis, the i.r. and 1H n.m.r. spectrum, the effective magnetic moment, and the protolysis products.
    Notes: Tetrakis(1-norbornyl)mangan (I) reagiert mit siedendem Tetrahydrofuran unter Abspaltung von Ethylen und Norbornan zu Mangantetravinyloxid, Mn(OCH=CH2)4 · 0,5 THF (II), als dem ersten bekannt gewordenen Mangan(IV)-alkoxid. Die Verbindung wurde durch Elementaranalyse, das IR- und 1H-NMR-Spektrum, das effektive magnetische Moment und durch die Protolyseprodukte charakterisiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885640110
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  • 5
    Electronic Resource
    Electronic Resource
    Contributions to the chemistry of organo-transition metal compounds. 51. Preparation and characterization of the organomanganese(III) compound Na[Mn(C5H5)4] (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 554 (1987), S. 132-136 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875541117
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  • 6
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 47. Zur Reaktion von Hexachloroceraten(IV) mit Lithiumorganylen (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 536 (1986), S. 147-152 
    Details
    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 Organo-Transition Metal Compounds. 47. Reactions of Hexachlorocerates(IV) with Organolithium CompoundsPyridinium hexachlorocerate(IV) reacts with lithium organyls RLi RLi (R = 1-Nor, (CH3)2NCH2CH2CH2, n-C4H9) in the molar ratio 1:2 with formation of Li2[CeCl6] · 2 NC5H5. A further mol RLi effects a reduction to Li3[CeCl6] · 2 NC5H5. With an excess of RLi amidocerium(III) complexes of the typ Li4 are formed.Li2[CeCl6] is formed also at reactions of quartery ammonium salts, e. g. [C6H5CH2N(C2H5)3]2[CeCl6], with RLi (R = 1-Nor, Me22NCH2CH2CH2) followed by an reduction to Li3[CeCl6]. An excess of the lithium organyl effects the formation Li4[RCeCl6] complexes.The yielded compounds were characterized by elementary analysis, the hydrolysis and deuterolysis products, magnetic moments, and IR-spectra.
    Notes: Pyridiniumhexachlorocerat(IV) reagiert mit Lithiumorganylen RLi (R = 1-Nor, (CH3)2NCH2CH2CH2, n-C4H9) im Molverhältnis 1:2 zu Li2[CeCl6] · 2 NC5H5. Ein weiteres Mol RLi bewirkt eine Reduktion zum Li3[CeCl6] · 2 NC5H5. Mit einem Überschuß an RLi erfolgt die Bildung von Amidocer(III)-Komplexen des Typs Li4Bei der Reaktion von quartären Ammoniumsalzen, z. B. von [C6H5CH2N(C2H5)3]2[CeCl6], mit RLi (R = 1-Nor, (CH3)2NCH2CH2CH2) entsteht zunächst ebenfalls Li2[CeCl6] neben einem tert. Amin, gefolgt von der Reduktion zum Li3[CeCl6]. Ein Überschuß des Lithiumorganyls bewirkt in diesem Falle die Bildung von Organylhexachlorocerat(III)-Komplexen des Typs Li4[RCeCl6].Die erhaltenen Verbindungen wurden durch Elementaranalysen, ihre Hydrolyse- und Deuterolyseprodukte, die magnetischen Momente und IR-Spektren charakterisiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865360517
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  • 7
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. XLIX. Reaktionen von Cerium(IV)-acetylacetonat mit Lithium- und Magnesiumorganylen (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 543 (1986), S. 192-198 
    Details
    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 Organo Transition Metal Compounds. XLIX. Reactions of Cerium(IV) Acetylacetonate with Organolithium and Organomagnesium CompoundsReacting Ce(acac)4 with lithium organyls RLi (R = CH3 1-Nor1), ((CH3)2NCH2CH2CH2) in the molar ratio 1:1 the cerium compound is reduced with formation of Li[Ce(acac)4]. Using a molar ratio of Ce:Li = 1:4 organocerium complexes of the composition R3Ce · 3 Li(acac) or Li3[R3Ce(acac)3] are formed. From reactions with excess CH3Li (Ce: Li = 1:7) Li3[Ce(CH3)6] · 3 Li(acac) could be isolated.All cerium complexes are characterized by elementary analysis, hydrolysis products, i.r. spectra, and molecular weight determination.
    Notes: Ce(acac)4 reagiert mit Lithiumorganylen RLi (R = CH3, 1-Nor1), ((CH3)2NCH2CH2CH2) im Molverhältnis 1:1 unter Reduktion zum Cerium(III)-Komplex Li[Ce(acac)4]. Wählt man ein Molverhältnis von 1:4, so entstehen Organocerium(III)-Komplexe der Zusammensetzung R3Ce · 3 Li(acac) bzw. Li3[R3Ce(acac)3]. Donormoleküle bewirken keine Abspaltung des Li(acac), sondern werden zusätzlich addiert unter Bildung von Komplexen des Typs Li3[R3Ce(acac)3] · n D (D = THF, n = 2; D = DME, TMED2), n = 1. Bei Reaktionen mit überschüssigem CH3Li (Ce:Li = 1:7) wurde Li3[Ce(CH3)6] · 3 Li(acac) isoliert.Bei Umsetzungen von Ce(acac)4 mit Dibenzyl- und Bis(1-naphthylmethyl)magnesium wurden Cerium(III)-Komplexe der Zusammensetzung Ce(acac)3 · RMg(acac) gebildet.Alle erhaltenen Verbindungen wurden durch ihre Elementaranalysen, Hydrolyseprodukte, IR-Spektren und durch Molmassebestimmungen charakterisiert.Ce(acac)4 reacts with dibenzyl and bis (1-naphthylmethyl) magnesium with formation of complexes of the type Ce(acac)3 · RMg(acac).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865431223
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  • 8
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 50. Eine ungewöhnliche Organolanthanverbindung (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 548 (1987), S. 175-179 
    Details
    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. 50. A non-common Organolanthanum CompoundLanthanum reacts with dibenzyl mercury in tetrahydrofuran as a solvent with splitting of solvent molecules and with formation of ethylene and a benzyl hydrido vinyloxide lanthanum complex of the composition C6H5CH2La(H)OCH=CH2 · 2 THF. This complex, primary well soluble in tetrahydrofuran, is extremely sensitive against air and moisture and undergoes a fast coordination polymerisation with a strong decrease of the solubility.The compound was characterized by elementary analysis, the hydrolysis and deuterolysis reaction, and by the i.r. spectra.
    Notes: Lanthan reagiert mit Dibenzylquecksilber in Tetrahydrofuran als Reaktionsmedium unter Spaltung von Lösungsmittelmolekülen zu Ethylen und einem Benzylhydridovinyloxid-lanthan-Komplex der Zusammensetzung C6H5CH2La(H)OCH=CH2 · 2 THF. Dieser anfangs in Tetrahydrofuran gut lösliche Komplex ist extrem luft- und feuchtigkeitsempfindlich und unterliegt rasch einer Koordinationspolymerisation unter starker Abnahme der Löslichkeit.Die Charakterisierung erfolgte durch Elementaranalyse, Verfolgung der Hydrolyse und Deuterolyse sowie Auswertung des IR-Spektrums.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875480520
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von Ammonium-pentanitratopraseodymat und -neodymat (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 569 (1989), S. 106-110 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895690110
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  • 10
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. XXXVII. Zur Existenz von 1-Norbornylverbindungen des Wolframs und Molybdäns (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 508 (1984), S. 50-54 
    Details
    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. XXXVII. About the Existence of 1-Norbornyl Compounds of Tungsten and MolybdenumReactions of WCl6, WCl4, WO2Cl2, WOCl4, MoCl5, and MoO2(acac)2 with 1-Norbornyl lithium (1-NorLi1)) are described. From WCl6 and WCl4 [(1-Nor)2W]n is formed, whereas in dependence of the solvent WO2Cl2 and WOCl4 are transformed into the complexes Li2[1-NorWOCl4] · THF, Li[WOCl4], Li[WO2Cl2], and Li2[WO2Cl2]. MoCl5 and MoO2(acac)2 are reduced with formation of Li[MoCl5], Li[MoO2(acac)2] and Li2[MoO2(acac)2].  -  Stable (1-Nor)4M-derivatives of molybdenum and tungsten, comparable those of 3d-metals (M = Ti—Co) seem not to exist.
    Notes: Es wird über Reaktionen von WCl6, WCl4, WO2Cl2, WOCl4, MoCl5 und MoO2(acac)2) mit 1-Norbornyllithium (1-NorLi1)) berichtet. Ausgehend von WCl6 und WCl4 wird [(1-Nor)2W]n gebildet, während WO2Cl2 und WOCl4 je nach Lösungsmittel Komplexe der Formeln Li2[1-NorWOCl4] · THF, Li[WOCl4], Li[WO2Cl2] und Li2[WO2Cl2] ergeben. MoCl5 und MoO2(acac)2 werden zu Li[MoCl5], Li[MoO2(acac)2] und Li2[MoO2(acac)2] reduziert. - Den stabilen (1-Nor)4M-Derivaten der 3d-Metalle (M = Ti—Co) vergleichbare Verbindungen des Molybdäns und Wolframs scheinen nicht zu existieren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845080108
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