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  • 1990-1994  (2)
  • 1991  (2)
  • Analytical Chemistry and Spectroscopy
  • Crystal Structure
  • 1
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The intact ion yields of phosphotyrosine, phosphothreonine and mono- and diphosphoserine residue-containing peptides have been compared with the non-phosphorylated sequences using plasma desorption mass spectrometry. Equimolar mixtures of the phosphorylated (MP) and non-phosphorylated peptides (M) were also analysed. The positive mass spectra of these mixtures show a higher intensity of the [M + H]+ compared with the [MP + H]+. In the negative mass spectrum, the bias towards the [M - H]- compared with the [MP - H]- was reduced, but the spectra generally did not accurately reflect the stoichiometry.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 593 (1991), S. 185-192 
    ISSN: 0044-2313
    Keywords: Calciumcarbide Chloride ; Synthesis ; Crystal Structure ; Allylenide Ion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of a Calciumcarbide Chloride Containing a C34- Unit, Ca3Cl2C3Ca3Cl2C3 was prepared from calcium, CaCl2 and graphite in sealed tantalum capsules. Red, transparent crystals were obtained from heating the mixture to 900°C (for one day) and annealing afterwards at 780°C for three days. The compound forms a layered structure (Cmcm, Z = 4, a = 384.24(9) pm, b = 1340.7(3) pm, c = 1152.6(3) pm, R = RW = 0.036 for 481 independent intensities) with alternating stacks of double layers of Ca2+ and monolayers of Cl-. The double layers of calcium contain allylenide ions, C34-. The latter exhibit C2v symmetry, a bond angle (C—C—C) of 169.0(6)° and a C—C separation of 134.6(4) pm.
    Notes: Ca3Cl2C3 entsteht aus Calcium, CaCl2 und Graphit in verschweißten Tantal-Kapseln in Form roter, transparenter Kristalle durch Erhitzen des Reaktionsgemenges auf 900°C (1 Tag) und anschließendes dreitägiges Tempern bei 780°C. Die Verbindung kristallisiert in einer Schichtstruktur (Cmcm, Z = 4, a = 384,24(9) pm, b = 1 340,7(3) pm, c = 1 152,6(3) pm, R = RW = 0,036 für 481 unabhängige Intensitäten) mit einer alternierenden Anordnung von Doppelschichten aus Ca2+ und Schichten aus Cl-. In den Calcium-Doppelschichten liegen die Allylenidionen, C34-. Sie zeigen C2v-Symmetrie mit einem Bindungswinkel (C—C—C) von 169,0(6)° und dem C—C-Bindungsabstand von 134,6(4) pm.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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