Association patterns of platinated purine nucleobases in metal-modified pairs and triples |
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Authors: | Roitzsch Michael Rother Irene B Willermann Michael Erxleben Andrea Costisella Burkhard Lippert Bernhard |
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Institution: | Fachbereich Chemie, Universit?t Dortmund, 44221 Dortmund, Germany. |
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Abstract: | Blocking of Watson-Crick or Hoogsteen edges in purine nucleobases by a metal entity precludes involvement of these sites in interbase hydrogen bonding, thereby leaving the respective other edge or the sugar edge as potential H bonding sites. In mixed guanine, adenine complexes of trans-a2PtII (a = NH3 or CH3NH2) of composition trans-(NH3)2Pt(9-EtA-N1)(9-MeGH-N7)](NO3)2 (1a), trans-(NH3)2Pt(9-EtA-N1)(9-MeGH-N7)](ClO4)2 (1b), and trans,trans-(CH3NH2)2(9-MeGH-N7)Pt(N1-9-MeA-N7)Pt(9-MeGH-N7)(CH3NH2)2](ClO4)4*2H2O (2) (with 9-EtA = 9-ethyladenine, 9-MeA= 9-methyladenine, 9-MeGH = 9-methylguanine), this aspect is studied. Thus, in 1b pairing of two adenine ligands via Hoogsteen edges and in 2 pairing of two guanine bases via sugar edges is realized. These situations are compared with those found in a series of related complexes. |
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