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1996 (1)
1993 (1)
1Author    Emerich Eichhorn, Anton Rieker, Bernd Speiser, Jürgen Sieglen, Joachim SträhleRequires cookie*
 Title    Electrochemistry of Oxygenation Catalysts, Part 2 + Improved Synthesis, Crystal Structure, and Electrochemical Properties of N,N-Bis(salicylidene)ethylenediaminatocobalt(III) Chloride  
 Abstract    N,N'-Bis(salicylidene)ethylenediaminatocobalt(III) hydroxide is treated with chloroform in methanol to yield the corresponding chloride in pure, crystalline form. Results of the crystal structure determination compare well with those in earlier reports of dimeric [Co(salen)Cl]2 units and incorporated CHC13 molecules. Electrochemical experiments in D M F and pyridine show that the chloride fully dissociates in these donor solvents. Thus, the quasireversible one-electron reduction to Co(salen) is observed in cyclic voltammograms. 
  Reference    Z. Naturforsch. 48b, 418—424 (1993) 
  Published    1993 
  Keywords    Oxygenation Catalyst, Cobalt Schiff-Base Complex, Crystal Structure, Electrochemistry 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0418.pdf 
 Identifier    ZNB-1993-48b-0418 
 Volume    48 
2Author    BernhardG. Ollasa, S. Bernd, Peiser1, H. Artm, Ut Stahp, Jürgen Sieglenb, Joachim StrählebRequires cookie*
 Title    Electrochemistry of Oxygenation Catalysts, Part 6* Electrosynthesis, Structure, Analytical and Electrochemical Properties of Monomeric [Coin(salen)(DMF)2]+ X' Salts (X = PF6, C104)  
 Abstract    Electrochemistry [CoH1(salen)(DMF)2]+ X" salts [X = PF6, C104; salen = bis(salicyliden)ethylendiiminato; DMF = dimethylformamide] have been synthesized by electrochemical and chemical (air) oxidation of Co"(salen). Their monomeric structure with two DMF molecules in the axial positions in both the solid state and DMF solution is shown by X-ray crystal structure analysis, thermal analysis, mass spectroscopy, and 'H and l3C NMR spectroscopy. The electrochemical reduction of the [Coni(salen)(DMF)2]+ cation is investigated by cyclic voltammetry and com­ pared to the oxidation of the neutral CoH(salen). The redox reaction connecting the cobalt(II) and the cobalt(III) species appears to be a quasi-reversible electron transfer. These properties make the [Co1 1 (salen)(DMF)2]+ X-salts starting materials for the analysis of the interaction of basic substrates with cobalt(III) species in the context of the biomimetic oxygenation reactions catalyzed by such complexes. 
  Reference    Z. Naturforsch. 51b, 388—398 (1996); received September 4. 1995 
  Published    1996 
  Keywords    Cobalt Complexes, Oxygenation Catalysts, Crystal Structure, Solution Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0388.pdf 
 Identifier    ZNB-1996-51b-0388 
 Volume    51