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Mode of coordination and stability of Cu(II) and Zn(II) complexes with adenosine, deoxyadenosine, cytidine and deoxycytidine

Art der Koordination und Stabilität von Cu(II)- und Zn(II)-Komplexen mit Adenosin, Deoxyadenosin, Cytidin und Deoxycytidin

  • Anorganische Und Physikalische Chemie
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Summary

Stability constants of Cu(II) and Zn(II) complexes with nucleosides have been determined from a computer analysis of potentiometric titration results. Spectral investigations prove that in acidic solution adenosine coordinates to Cu(II)via its N1 or N7 atoms, while atpH>7 only N7 is involved. Similar interactions are observed for dAdo complexes. Spectral and potentiometric studies suggest that Zn does not form stable complexes with dAdo. In the case of cytidine and deoxycytidine, the preferred site of coordination is the N3 atom of the nucleoside. Oxygen atoms from the carbonyl groups are not involved in Cu(II) or Zn(II) coordination. The results of the spectral investigation have excluded the ribose and deoxyribose moieties of all studied ligands from participation in the interactions. In general, the mode of coordination of nucleosides and deoxynucleosides with Cu(II) and Zn(II) has been found analogous.

Zusammenfassung

Mittels einer Computeranalyse von Ergebnissen aus potentiometrischen Titrationen wurden Stabilitätskonstanten für Komplexe aus Cu(II) bzw. Zn(II) und Nucleosiden bestimmt. Spektroskopische Untersuchungen zeigen, daß Adenosin in saurer Lösung über N1 oder N7 an Cu(II) koordinieren kann, während beipH>7 nur N7 reagiert. Analoges wird für die Komplexe mit dAdo beobachtet. Aus spektroskopischen und potentiometrischen Untersuchungen geht hervor, daß Zn mit dAdo keine stabilen Komplexe bildet. Im Fall von Cytidin und Deoxycytidin ist N3 die bevorzugte Koordinationsstelle des Nucleosids. Die Sauerstoffatome der Carbonylgruppen sind an der Bindung an Cu(II) und Zn(II) nicht beteiligt. Die spektroskopischen Ergebnisse schließen eine Beteiligung der Ribose- und Deoxyriboseeinheiten an den Wechselwirkungen aus. Allgemein wurde für Nucleoside und Deoxynucleoside ein analoger Koordinationsmodus gefunden.

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Authors and Affiliations

  1. Faculty of Chemistry, Adam Mickiewicz University, PL-60780, Poznan, Poland

    A. Gasowska & L. Lomozik

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  1. A. Gasowska
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  2. L. Lomozik
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Gasowska, A., Lomozik, L. Mode of coordination and stability of Cu(II) and Zn(II) complexes with adenosine, deoxyadenosine, cytidine and deoxycytidine. Monatsh Chem 126, 13–22 (1995). https://doi.org/10.1007/BF00811753

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  • DOI: https://doi.org/10.1007/BF00811753

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