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  • preparation  (3)
  • Biochemistry and Biotechnology  (2)
  • Alkali uranium halides, A2UX5 (A = K, Rb; X = Cl, Br, I)  (1)
  • Wiley-Blackwell  (5)
  • American Chemical Society
  • Elsevier
  • 1990-1994  (5)
  • 1950-1954
  • 1945-1949
  • 1880-1889
  • 1994  (5)
  • 1954
Collection
Keywords
Publisher
  • Wiley-Blackwell  (5)
  • American Chemical Society
  • Elsevier
Years
  • 1990-1994  (5)
  • 1950-1954
  • 1945-1949
  • 1880-1889
Year
  • 1
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Struktur von Sr3(BN2)2 (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 262-265 
    Details
    ISSN: 0044-2313
    Keywords: Ca3(BN2)2 ; Sr3(BN2)2 ; NaSr4(BN2)3 ; preparation ; structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of Sr3(BN2)2The structure of Sr3(BN2)2 was determined on single-crystal X-ray data collected with a four-circle diffractometer. Sr3(BN2)2 crystallizes in the cubic space group Im3m (no. 229) with a = 764.56(3) pm and Z = 3. The structure contains linear BN3-2 ions with a B—N bond length of 135.8(6) pm. The straight forward synthesis employing metal nitrides plus boron nitride yielded crystalline powders of M3(BN2)2 (M = Ca, Sr) at 1100°C (5 days). Cubic indexing of guinier patterns gave a = 765.8(1) pm for M = Sr and a = 734.7(2) pm for M = Ca. The structure refinement on a single crystal of Sr3(BN2)2 revealed that one strontium site (2a; 0, 0, 0) is occupied by only about 50%. It has been tried to fully occupy this site with an alkali metal (A) to obtain ASr4(BN2)3 (Z = 2). Reactions with A = Na yielded crystalline powders. Cubic indexing of the guinier pattern analogous to that of Sr3(BN2)2 gave a = 754.2(1) pm.
    Notes: Die Struktur von Sr3(BN2)2 wurde anhand von Einkristall-Röntgendaten, die durch Messung an einem Vierkreisdiffraktometer erhalten wurden, bestimmt. Sr3(BN2)2 kristallisiert in der kubischen Raumgruppe Im3m (Nr. 229) mit a = 764,56(3) pm und Z = 3. Die Struktur enthält lineare BN3-2-Ionen mit einer Bindungslänge B—N von 135,8(6) pm. Die gezielte Darstellung aus den Metallnitriden und Bornitrid zu M3(BN2)2 (M = Ca, Sr) bei 1100°C (5 Tage) ergab kristalline Pulver. Kubische Indizierung der Guinierdiagramme gab a = 765,8(1) pm für M = Sr und 734,7(2) pm für M = Ca. Die Strukturverfeinerung an einem Einkristall von Sr3(BN2)2 zeigte, daß eine Strontiumlage (2a; 0,0,0) nur zu etwa 50% besetzt ist. Es wurde versucht, diese Lage mit einem Alkalimetall (A) entsprechend ASr4(BN2)3 (Z = 2) vollständig zu besetzen. Reaktionen mit A = Na ergaben kristalline Pulver, deren Guinierdiagramme analog zu Sr3(BN2)2 kubisch mit a = 754,2(1) pm indiziert werden konnten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200210
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, crystal structure, magnetism, and absorption spectra of A2UX5 Type Halides (A = K, Rb; X = Cl, Br, I)Dedicated to Professor Hugo F. Franzen on his 60th Birthday (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1339-1345 
    Details
    ISSN: 0044-2313
    Keywords: Alkali uranium halides, A2UX5 (A = K, Rb; X = Cl, Br, I) ; preparation ; crystal structure ; magnetic susceptibility ; UV-Vis spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese, Kristallstruktur, Magnetismus und Absorptionsspektren von Halogeniden des Typs A2UX5 (A = K, Rb; X = Cl, Br, I)Die ternären Uran(III)-halogenide A2UX5 (A = K, Rb; X = Cl, Br, I) wurden aus den binären Komponenten AX und UX3 in verschweißten Tantalampullen gewonnen. Nach Guinier-Aufnahmen (Raumtemperatur) kristallisieren sie sämtlich im K2PrCl5/Y2HfS5-Typ. Einkristall-Strukturverfeinerungen wurden für K2UI5 und Rb2UCl5 unternommen. Magnetische Suszeptibilitätsmessungen erfolgten mit einem SQUID-Magnetometer von Raumtemperatur bis zur Temperatur des flüssigen Heliums: Eindimensionale (innerhalb einer Kette) und dreidimensionale antiferromagnetische Ordnung wird bei tiefen Temperaturen, abhängig vom Abstand U3+—U3+, beobachtet. Absorptionsspektren wurden zwischen 4000 und 28000 cm-1 aufgenommen. Sie zeigen die für U3+ charakteristischen Übergänge und, abhängig vom Halogenid, sehr starke f - d Übergänge oberhalb 14000 bzw. 15000 cm-1.
    Notes: The ternary uranium(III) halides A2UX5 (A = K, Rb; X = Cl, Br, I) have been prepared from the binary components AX and UX3 in sealed tantalum containers. According to their Guinier X-ray powder patterns, they all crystallize with the K2PrCl5/Y2HfS5 type of structure. Lattice constants for ambient temperature are reported. Single-crystal structure refinemens were undertaken for K2UI5 and Rb2UCl5. Magnetic susceptibility data were recorded with a SQUID magnetometer from liquid helium to room temperature. One-dimensional (intrachain) and three-dimensional antiferromagnetic ordering occur at low temperatures dependent upon the U3+—U3+ distance. Absorption spectra were recorded between 4 000 and 28 000 cm-1. They show f - f transitions typical for U3+ and, depending on the halide, very strong f - d transitions above 14 000 to 15 000 cm-1, respectively.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200802
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  • 3
    Electronic Resource
    Electronic Resource
    Über die Synthese von Erdalkalimetalldihalogeniden und die Strukturen von Ca3Br2CBN und Sr3Cl2CBN (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 258-261 
    Details
    ISSN: 0044-2313
    Keywords: alkaline-earth dihalides ; Ca3Br2CBN ; Sr3Cl2CBN ; preparation ; structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Synthesis of Alkaline-Earth Dihalides and the Structures of Ca3Br2CBN and Sr3Cl2CBNThe reaction of alkaline-earth carbonates with ammonium chloride or bromide yields alkaline-earth dihalides at relatively low temperatures (300°C). Ca3Br2CBN and Sr3Cl2CBN were synthesized in sealed niobium containers at 950°C from the metal, its dihalide, boron nitride and graphite. The crystal structure of Sr3Cl2CBN was refined from single crystal data. Sr3Cl2CBN crystallizes isotypic with Ca3Cl2CBN in the orthorhombic space group Pnma (No. 62) with a = 1448.4(2) pm b = 405.46(5) pm, c = 1170.0(1) pm. The lattice constants of Ca3Br2CBN and Sr3Cl2CBN were determined by orthorhombic indexing of the powder patterns (Ca3Br2CBN: a = 1444.3(2) pm, b = 390.64(6) pm, c = 1139.2(2) pm; Sr3Cl2CBN: a = 1444.0(4) pm, b = 405.27(8) pm, c = 1167.8(2) pm). There was no success in preparing homologues with Barium.
    Notes: Die Umsetzung von Erdalkalimetallcarbonaten mit Ammoniumchlorid oder Ammoniumbromid liefert bei relativ niedrigen Temperaturen (300°C) Erdalkalimetalldihalogenide. Ca3Br2CBN und Sr3Cl2CBN wurden in verschweißten Niobcontainern bei 950°C aus dem Metall, dessen Dihalogenid sowie Bornitrid und Graphit hergestellt. Die Kristallstruktur von Sr3Cl2CBN wurde mit Einkristalldaten verfeinert. Sr3Cl2CBN kristallisiert isotyp zu Ca3Cl2CBN in der orthorhombischen Raumgruppe Pnma (Nr. 62) mit a = 1448,4(2) pm, b = 405,46(5) pm, c = 1170,1(1) pm. Die Gitterkonstanten von Ca3Br2CBN und Sr3Cl2CBN wurden durch orthorhombische Indizierung der Pulverdiagramme bestimmt (Ca3Br2CBN: a = 1444,3(2) pm, b = 390,64(6) pm, c = 1139,2(2) pm; Sr3Cl2CBN: a = 1444,0(4) pm, b = 405,27(8) pm, c = 1167,8(2) pm). Es gelang nicht, Barium-homologe darzustellen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200209
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  • 4
    Electronic Resource
    Electronic Resource
    Differentation by preparative continuous free flowisoelectric focusing of cyclosporin A inhibitable peptidyl-prolyl cis/trans isomerase of human erythrocytes (1994)
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 960-967 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Preparative continuous free flow-isoelectric focusing has been used to separate at least three different components of intrinsic peptidyl-prolyl cis/trans isomerase (PPIase) activity from erythrocytes lysate. By adding chemical spacer molecules like glycine and Bicine to commercial carrier ampholyte mixtures the resulting pH profile was predictably influenced. With an applied field strength of 125-170 V/cm a residence time of less than 15 min was sufficient for the separation of PPIases with isoelectric points of 5.4, 5.7 and 5.9 from the bulky hemoglobin. The recovery of the overall PPIase activities was about 100%. The purification factor has been determined as 20- to 100-fold. For each isoform of the enzyme the peptidyl-prolyl cis/trans isomerase acitivity of the separated proteins was inhibited by cyclosporin A but was resistant toward FK 506.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501501140
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  • 5
    Electronic Resource
    Electronic Resource
    Separation of cis/trans isomers of a prolyl peptide bond by capillary zone electrophoresis (1994)
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 1151-1157 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: On capillary electrophoresis of the chemically pure thioxo peptide Ala-Phe-ψ[CS-N]-Pro-Phe-4-nitroanilide a peak splitting was observed at a capillary temperature of 25°C. By contrast, the oxo peptide analogue exhibits a single, sharp peak under these conditions. Both peaks of the thioxo compound coincided gradually when the temperature was increased to 60°C. Peak fusion was reverted by cooling down the heated sample. This behavior could be attributed to the electrophoresis-mediated separation of the cis/trans prolyl bond isomers of the thioxo peptide, allowing data of this conformational equilibrium to be determined. Derived from computational data about molecular volume and the hydration energy of low-energy cis and trans isomeric structures, the more rapid migration of the cis form in comparison to trans may be explained by structural parameters.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501501174
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