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1980 (1)
1978 (1)
1Author    JohannW. Buchler, Wolfgang Kokisch, PaulD. Smith, Bernhard TonnRequires cookie*
 Title    Metallkomplexe mit Tetrapyrrol-Liganden, XIX [1] Synthese und elektrochemische Charakterisierung der Kohlenmonosulfid-Metalloctaethylporphyrine mit Eisen(II) oder Osmium(II) im Zentrum. Ein Beitrag zur "Bathochromie-Regel"  
 Abstract    The preparation and spectroscopic characterization of thiocarbonyl metalloporphyrins M(OEP)CS(L') (e.g. 2e: M = Fe, L' = Py, le: M = Os, L' = Py** are described. Especially noteworthy is the existence of a pentacoordinate, diamagnetic, air-stable heme Fe(OEP)CS (2f: M = Fe, no L'). A linear correlation of the a-band frequencies (expressed as Va) in the optical spectrum and the metal(II/IH) redox potentials (E1/2) taken from cyclic voltam-metry experiments suggests (Abb. 3) that in complexes of the type M(OEP)LL' (1, 2) K is bathochromically shifted as the 7r-acceptor capacity of L increases ("Rule of Batho-chromism"). The strong 71-acceptor capacity of carbon monosulphide renders the attack of dioxygen to the thiocarbonyl heme unfavourable; O2 and CS seem to be comparable in their jr-acceptor strength. 
  Reference    Z. Naturforsch. 33b, 1371—1380 (1978); eingegangen am 29. Juni 1978 
  Published    1978 
  Keywords    Hemes, Osmium Porphyrins, Thiocarbonyl Complexes, Electrochemistry, Electronic Absorption Spectra 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1371.pdf 
 Identifier    ZNB-1978-33b-1371 
 Volume    33 
2Author    JohannW. Buchler, Kiong-Lam Lay, Harald StoppaRequires cookie*
 Title    Metallkomplexe mit Tetrapyrrol-Liganden, XXIV [1] Zur Kenntnis der Platin(IV)-Porphyrine Metal Complexes with Tetrapyrrole Ligands, XXIV [1] On the Knowledge of Platinum(IV) Porphyrins  
 Abstract    The first platinum(IV) porphyrin, dichloromeso-tetra(jo-tolyl)porphinatoplatinum(IV) [Pt(TPP)Cl2**], is prepared by oxidation of the corresponding platinum(II) complex [Pt(TTP)**] with hydrogen peroxide in acidic media and treatment with hydrogen chloride. Pt(TTP)Cl2 is thermally stable up to 200 °C. Electrochemical reduction yields Pt(TTP), presumably by a two-electron step. The platinum-to-porphyrin jr-backbonding known to exist in Pt(TTP) decreases on oxidation to Pt(TTP)Cl2 but does not vanish. An improved synthesis of Pt(TTP) is described. Evidence for the accessibility of Pt(OEP)Cl2 and Pd(TTP)Cl2 is also presented. 
  Reference    Z. Naturforsch. 35b, 433—438 (1980); eingegangen am 7. Januar 1980 
  Published    1980 
  Keywords    Platinum Porphyrins, Palladium Porphyrins, Electronic Absorption Spectra, Electrochemistry of Metalloporphyrins 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0433.pdf 
 Identifier    ZNB-1980-35b-0433 
 Volume    35