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1992 (1)
1978 (1)
1Author    Henry StrasdeitRequires cookie*
 Title    Synthesis, Spectroscopic and X-Ray Structural Characterization of |Cd(linpen)l2+, a Model for M etal Complexes of the Chelating Polymer Polyethyleneimine (linpen = Linear Pentaethylenehexamine)  
 Abstract    The isolation of 3,6,9,12-tetraazatetradecane-l,14-diam ine (linear isomer o f pentaethylene­ hexamine, linpen) from a technical polyamine mixture is described. In methanol, linpen acts as a hexadentate ligand tow ards cadmium(II). The solid compounds [Cd(linpen)](BPh4)2 (1), [Cd(linpen)](BPh4)2-2D M SO (2) and [Cd(linpen)](BF4)2 (3) have been isolated and character­ ized by elemental analysis, spectroscopy and X-ray powder diffraction. The 113Cd N M R reso­ nance of 1 is at 351 ppm (0.30 M in DM SO -d6, standard: 0.10 M Cd(C104)2 in D 20). 2 and 3 have been structurally characterized by single-crystal X-ray diffraction. 2: C2/c; a = 19.337(1) A, b = 17.937(1)Ä, c = 18.584(1)Ä, ß = 1 1 1.54(1)°; Z = 4, R = 0.034, Rw = 0.033. 3: P2,/h; a = 8.607(1)Ä, b = 14.851(2)Ä, c = 15.703(2)Ä, ß = 91.21(2)°; Z = 4, R = 0.083, R" = 0.072. Both com pounds contain discrete [Cd(linpen)]2+ complexes. The hexamine wraps ar­ ound the metal ion in a helical manner. This results in a strong distortion of the coordination polyhedron. The mean C d -N bond lengths are 2.38Ä and 2.37Ä for 2 and 3, respectively. Models for M N 6 centers in metal-polyethyleneimine (PEI) complexes are derived from the structure of [Cd(linpen)]2+. F or example, loops at the M N 6 site in molecules of linear PEI are proposed. 
  Reference    Z. Naturforsch. 47b, 829—836 (1992); received December 12 1991 
  Published    1992 
  Keywords    Pentaethylenehexamine, Cadmium Complex, Synthesis, Crystal Structure, Polyethyleneimine 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0829.pdf 
 Identifier    ZNB-1992-47b-0829 
 Volume    47 
2Author    R. Thauer, H. Schirrmacher, W. Schymanski, P. SchönheitRequires cookie*
 Title    A Rapid Procedure for the Purification of Ferredoxin from Spinach Using Polyethyleneimine  
 Abstract    A rapid procedure for the purification of ferredoxin from spinach is described, which is based on the finding that ferredoxins can be precipitated with polyethyleneimines from acetone containing solutions. The ferredoxin was obtained in high yields (25 — 35 mg/kg spinach) and high purity (A 420/ A 27S= O . 4 7) within less than 8 hours. 
  Reference    Z. Naturforsch. 33c, 495—497 (1978); received M ay 17 1978 
  Published    1978 
  Keywords    Ferredoxin, Iron-Sulfur Proteins, Spinach, Photosynthesis, Polyethyleneimine 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0495.pdf 
 Identifier    ZNC-1978-33c-0495 
 Volume    33