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1979 (1)
1974 (1)
1Author    Wolfgang Lohmann, Max Hillerbrand, Max KlenertRequires cookie*
 Title    Charge-Transfer Interactions between Nucleobases and Metal Ions: ESR and Optical Absorption Studies  
 Abstract    The charge-transfer interaction of different nucleobases with Cu2+ has been investigated by means of ESR and optical absorption studies. It could be shown that cytosine forms the strongest complex. The greatest reduction of Cu2+ (that is, spin concentration) was obtained, however, with adenine. Based on these results the following order for the electron donor strength of the nucleo­ bases has been obtained: Ade>Cyt!>Thy>Ura. In troduction 
  Reference    (Z. Naturforsch. 29c, 667 [1974]; received March 18/June 15 1974) 
  Published    1974 
  Keywords    CT-Interactions, Electron Donor, Nucleobases, ESR, Metal Ions 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0667.pdf 
 Identifier    ZNC-1974-29c-0667 
 Volume    29 
2Author    Manfred Schnarr, MichaelM. Atthies, Wolfgang LohmannRequires cookie*
 Title    The Influence of Different Solvents on the Interaction between Metal Ions and Tetracycline  
 Abstract    The interaction o f the antibiotic tetracycline with a few metal ions, esp. Cu(II), in different so l­ vents has been investigated by means o f IR, ESR, and U V /V IS spectroscopy. It could be shown that the site o f com plexation depends on the solvent used. In DM SO the interaction occurs mainly via the A ring. In water (pH = 5.7) and octanol, the A chrom ophore as well as the BCD entity o f the m olecule are involved in com plexation. If the tetracycline concentration exceeds the Cu(II) concentration, a 2 : 1 (antibiotic : Cu(II)) com plex seems to be formed, at least in DM SO. 
  Reference    Z. Naturforsch. 34c, 1156 (1979); received June 25 1979 
  Published    1979 
  Keywords    Tetracycline, Antibiotics, Metal Ions, Com plexation, O ptical Absorption 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1156.pdf 
 Identifier    ZNC-1979-34c-1156 
 Volume    34