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1998 (1)
1985 (1)
1Author    Dirk Steinbom, Olaf Gravenhorst, Henrik Junicke, FrankW. HeinemannRequires cookie*
 Title    Synthese und Charakterisierung von kronenetherstabilisierten Platin(IV)- Komplexen mit Aminosäureliganden Synthesis and Characterization of Amino Acid Complexes of Platinum(IV) Stabilized by Crown Ethers  
 Abstract    Crown ether complexed pentachloro(aqua)platinic acid, (H30)[PtCl5(H20)]-2(18-cr-6) • 6H20 (1) reacts with glycine, L-alanine, and DL-2-aminobutyric acid to give ds-[PtCl4(0-glyH)(H20)](1 8 -cr-6)H 20 (4a)1 and ds-[PtCl4(0-amacH)(H2O)](18-cr-6) (amacH = alaH 4b, abuH 4c), respectively, as well as (amacH2)2[PtCl6]-2(18-cr-6) (amacH = glyH 5a, alaH 5b, abuH 5c). The crown ether complexed hexachloroplatinic acid, (H30) 2[PtCl6]-2(18-cr-6) (2), reacts with glycine to afford (glyH2)[PtCl4(yV,0-gly)]-2(18-cr-6)1.25H20 (6). The structures of 4b and 6 were determined by X-ray diffraction. The alanine ligand in 4b is a zwitterion that is coordinated to platinum by one oxygen atom of the carboxylate group only. The other oxygen atom is engaged in a strong hydrogen bond to the ds-coordinated aqua ligand. The glycinato ligand in 6 is /V,(9-coordinated at platinum forming an anion [PtCl4(/V,0-gly)]_ . The other oxygen atom of the carboxylate group is involved in a strong hydrogen bridge to the cation (glyH2)+. In both complexes hydrogen bridges are formed between the -N+H3 and -NH2 groups of the amino acid ligands and the oxygen atoms of the crown ether molecules. 1 Abbreviations: amacH = amino acid, glyH = glycine, alaH = L-alanine, abuH = DL-2-amino-butyric acid. 
  Reference    Z. Naturforsch. 53b, 581—586 (1998); eingegangen am 16. Januar 1998 
  Published    1998 
  Keywords    Platinum(IV) Complexes, Crown Ethers, Amino Acids, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0581.pdf 
 Identifier    ZNB-1998-53b-0581 
 Volume    53 
2Author    Herbert Bissinger, Wolfgang BeckRequires cookie*
 Title    Metallkomplexe mit biologisch wichtigen Liganden, XXXIX [1] Platin(IV)-Komplexe mit a-Aminosäure-und Peptidestern; 15 N-und 195 Pt-NMR-Spektren von «-Aminosäuren-Platin-Komplexen Metal Complexes with Biologically Important Ligands, XXXIX [1] Platinum(IV) Complexes with a-Amino Acid Esters and Peptide Esters; l3 N and 14r, Pt NMR Spectra of Platinum Complexes with a-Amino Acids  
 Abstract    The platinum(IV) complexes PtX 4 L 2 (X = Cl, Br; 2 X = oxalate; L = glyOEt, glyglyOEt, gly-cleuOEt; 2 L = metOEt) have been obtained by oxidative addition of halogenes to platinum(II) compounds PtX 2 L2-A high field shift of <3 15 N (—50 ppm) is observed for the coordi-nated amino acid ligand of various platinum complexes, compared to the free ligand. Platinum(II) and platinum(IV) can be distinguished by their 195 Pt NMR signals. 
  Reference    Z. Naturforsch. 40b, 507—511 (1985); eingegangen am 12. November 1984 
  Published    1985 
  Keywords    a-Amino Acid Esters, Peptide Esters, Platinum(IV) Complexes, "N NMR Spectra, 195 Pt NMR Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0507.pdf 
 Identifier    ZNB-1985-40b-0507 
 Volume    40