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2000 (1)
1979 (1)
1Author    F. Leßmann, L. Beyer, K.-H Hallmeier, R. Richter, J. Sieler, R. Strauch, A. VoigtRequires cookie*
 Title    Vierzähnige Benzamidin-Liganden in ein-und mehrkemigen Kupfer(II)-Komplexen Quadridentate Benzamidine Ligands in Mono-and Oligonuclear Copper(II) Complexes  
 Abstract    Bridged N-thiocarbamoyl substituted bis-benzamidines (C2H5)2N-C(S)-N=C(Ph)-NH-R-NH-C(Ph)=N-C(S)-N(C2H5)2 with different moieties R (H2L : R = diphenylmethane-2,2'-diyl, H2 L2: R = diphenylmethane-3,3'-diyl, and H2 L3: R = diphenylmethane-4,4'-diyl) were synthe­ sized by the reaction of N-(thiocarbamoyl)benzimidoyl chlorides with diamines. These quadri­ dentate ligands form neutral mononuclear (CuL1), dinuclear (Cu2L32) and trinuclear (Cu3 L2 3) copper(II) chelates in dependence of the different bridging unit in the ligands. The compounds were characterized by NMR, IR, EPR and XPS spectroscopy and FAB mass spectrometry. The molecular structures of the ligand H2L3 and the complex CuL1 have been determined by X-ray methods. 
  Reference    Z. Naturforsch. 55b, 253—261 (2000); eingegangen am 26. November 1999 
  Published    2000 
  Keywords    Benzamidines, Copper Chelates, EPR, ESCA 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0253.pdf 
 Identifier    ZNB-2000-55b-0253 
 Volume    55 
2Author    RichardJ. Youngman, AlanD. DodgeRequires cookie*
 Title    Mechanism of Paraquat Action: Inhibition of the Herbicidal Effect by a Copper Chelate with Superoxide Dismutating Activity  
 Abstract    The treatment of flax cotyledons (Linum usitatissimum) with paraquat was shown to decrease the levels of chlorophyll and carotenoid pigments. The fatty acid content of chloroplast fragments isolated from treated tissue was determined and shown to be greatly decreased by paraquat treat­ ment. The superoxide radical was demonstrated to play an important role in the phytotoxic action of paraquat by the use of a copper chelate of D-penicillamine, which has a high superoxide dismutat­ ing activity. The action of paraquat was inhibited by this compound. The role of superoxide is discussed with reference to the generation of more toxic species, such as singlet oxygen. 
  Reference    Z. Naturforsch. 34c, 1032—1035 (1979); received May 26 1979 
  Published    1979 
  Keywords    Paraquat, Plant Pigments, Fatty Acids, Superoxide, Copper Chelate, Flax Cotyledons 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1032.pdf 
 Identifier    ZNC-1979-34c-1032 
 Volume    34