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1992 (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