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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 129 (1998), S. 769-776 
    ISSN: 1434-4475
    Keywords: Keywords. Iron(III) complexes; Magnetic properties ; Antiferromagnetism; 1 ; 2-Bis(2-hydroxybenzamido)ethane.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Komplexe des Typs [(Fe(L))2O]ċH2O (H2 L=1,2-Bis(2-hydroxybenzamido)ethan), [(Fe(L))2 ter]ċ5H2O (H2 ter=Terephthalsäure), [Fe(L)bpy]BPh4 (bpy=2,2′-Bipyridyl) und [Fe(L)phen]ClO4ċH2O (phen=o-Phenanthrolin) wurden hergestellt und mittels Elementaranalyse, magnetochemischer Messungen und spektroskopischer Methoden untersucht. [(Fe(L))2O]ċH2O und [(Fe(L))2 ter]ċ5H2O sind wahrscheinlich binuklear, und die schwache antiferromagnetische Austauschwechselwirkung (μ eff pro Eisen(III)-Atom) wurde für den μ-oxo-Komplex zu 3.59 BM/77 K−4.91 BM/290 K (J=−7 cm−1, H=−2JS 1 S 2, S 1=S 2=5/2) und für den μ-terephthalato-Komplex zu 4.21 BM/82 K−5.35 BM/297 K (J=−5 cm−1) ermittelt. Die Eisen(III)-Komplexe mit bpy bzw. phen sind wahrscheinlich mononuklear; ihre anomalen μ eff-Werte (3.41 BM/80 K−3.68 BM/297 K für [Fe(L)bpy]BPh4 und 4.93 BM/259 K für [Fe(L)phen]ClO4ċH2O sind weder mit high-spin- (5.7–6.1 BM) noch mit low-spin-Zuständen (2.1–2.5 BM) in Einklang zu bringen.
    Notes: Summary.  Complexes of the type [(Fe(L))2O]ċH2O (H2 L=1,2-bis(2-hydroxybenzamido)ethane), [(Fe(L))2 ter]ċ5H2O H2 ter=terephthalic acid), [Fe(L)bpy]BPh4 (bpy=2,2′-bipyridyl), and [Fe(L)phen]ClO4ċH2O (phen=o-phenanthroline) were prepared and studied by elemental analysis, magnetochemical measurements, and spectroscopic methods. [(Fe(L))2O]ċH2O and [(Fe(L))2 ter]ċ 5H2O are probably binuclear, and the weak antiferromagnetic exchange interaction, (μ eff per one atom of iron(III) was found to be 3.59 BM/77 K−4.91 BM/290 K (J=−7 cm−1, H=−2JS 1 S 2, S 1=S 2=5/2) for the μ-oxo complex and 4.21 BM/82 K−5.35 BM/297 K (J=−5 cm−1) for the μ-terephthalato complex. The iron(III) complexes with bpy or phen are probably mononuclear; their anomalous μ eff values (3.51 BM/80 K−3.68 BM/297 K for (Fe(L)bpy]BPh4 and 4.93 BM/259 K for [Fe(L)phen]ClO4ċH2O, respectively) agree neither with high spin (5.7–6.1 BM) nor with low spin (2.1–2.5 BM) configurations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 42 (1929), S. 489-494 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Two carrier-free electrophoretic separation methods, capillary zone electrophoresis (CZE) and continuous free-flow zone electrophoresis (FFZE), have been applied to both microanalysis at the nanogram level and preparative fractionation, with a throughput of 30 mg/h, of synthetic growth hormone releasing peptide (GHRP). A crude product of GHRP, a hexapeptide with the sequence His-D-Trp-Ala-Trp-D-Phe-Lys-NH2, synthesized by the solid phase methodology, was desalted and analyzed by CZE. Based on the results of analytical CZE the separation was converted into a preparative purification procedure by continuous FFZE, employing the same separation medium (0.5 mol/L acetic acid, pH 2.6). The purity of peptide frcttions obtained by FFZE was reevaluated by CZE. The combination of these two techniques proved to be a valuable tool for both peptide analysis and peptide purification. A close correalation of CZE and FFZE, resulting from the fact that both methods are based on the same separation principle (zone electrophoresis) and that both are performed in a free solution of the same composition, was confirmed. However, when transforming data from CZE to FFZE, the different electroosmotic flow, temperature and electric field intensity in the capillary and in the flow-through cell, respectively, have to be taken into account and corresponding corrections have to be made.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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