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1985 (1)
1984 (1)
1983 (1)
1Author    Berthold Kiefer, Helmut Sapper, WolfgangL. Ohm AnnRequires cookie*
 Title    The Influence of Amino Acid Ligands and Vitamin C on the Reduction Potential of Fe(III): Polarographie and Electron Spin Resonance Investigations  
 Abstract    The pH dependence o f Fe(III)-am ino acid com plexes has been studied polarographically and by means o f ESR spectroscopy. It could be shown that, at least, two com plexes exist: one with a low m olecular weight, ESR detectable at acid pH. and one with a high molecular w eight at alkaline pH, ESR non detectable. The half wave potential o f Fe (III) is lowered by am ino acid ligands. The redox interaction o f the Fe(III)-amino acid com plexes with vitam in C results in a decrease o f the ascorbyl radical concentration. Ascorbic acid also forms a com plex with Fe(III) as in­ dicated by a polarographic half wave potential near -0.55 V vs. S.C.E. at pH 7. 
  Reference    Z. Naturforsch. 39c, 102—106 (1984); received September 22 1983 
  Published    1984 
  Keywords    Ferrous Ions Ascorbic Acid, Redox-Potential, Polarography, ESR -Spectroscopy 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0102.pdf 
 Identifier    ZNC-1984-39c-0102 
 Volume    39 
2Author    MartinG. Peter, HartmutB. Stegmann, Hoang Dao-Ba, Klaus SchefflerRequires cookie*
 Title      
 Abstract    ESR-spectra were recorded during the oxidation of N-acetyldopamine and N-ß-alanyldopamine in aqueous solutions. Semiquinone radicals were detected under conditions of spin stabilization by Z n2+ ions. The appearance of the spectra was the same in the presence or in the absence of proteins. No evidence was obtained for the formation of products that could have arisen eventual­ ly from intermolecular Michael-type addition of nitrogen nucleophiles. 
  Reference    Z. Naturforsch. 40c, 535—538 (1985); received January 31 1985 
  Published    1985 
  Keywords    ESR-Spectroscopy, Catecholamines, Semiquinones, Insect Cuticle 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0535.pdf 
 Identifier    ZNC-1985-40c-0535 
 Volume    40 
3Author    Christoph Eischenbroich, Edgar Bilger, Reinhart MöckelRequires cookie*
 Title    Metall-7r-Komplexe von Benzolderivaten, XX [1] Über die Cokondensation des Phenanthrens mit Chromatomen - Reaktivität, Redoxverhalten, ESR-und NMR-spektroskopische Untersuchungen Metal-^-Complexes of Benzene Derivatives, XX [1] Cocondensation of Phenanthrene with Chromium Atoms - Reactivity, Redox Behavior, ESR and NMR Spectroscopic Investigation  
 Abstract    Cocondensation of chromium atoms with phenanthrene vapor affords bis(^ 1 ' 2 ' 3 ' 4 ' 10a -4a -phenanthrene)chromium (4). X H NMR spectroscopy reveals, that the diastereomers 4 (rac) and 4' (meso) are formed in a 2:1 ratio. Cyclic voltammetric studies on 4 show, that four oxidation states are accessible: 4t, 4, 4t, 4 2+ [E° = —2.235 (rev.), —0.651 (rev.), + 0.82 (irrev.) V vs. SCE]. The radical ions 4t and 4 7 are characterized by ESR spectro-scopy in fluid and rigid solutions. Prominent feature of these species is the inverse relative magnitude of the g-tensor components: gn(41") > gi(4t); gn(47) < gi(47). 
  Reference    Z. Naturforsch. 38b, 1357—1364 (1983); eingegangen am 30. Juni 1983 
  Published    1983 
  Keywords    Cocondensation, Condensed Arenes, Bis(arene)transitionmetal Complexes, ESR Spectroscopy, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1357.pdf 
 Identifier    ZNB-1983-38b-1357 
 Volume    38