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Mehrkernige Platin(ii)- Und (III)-Komplexe

Mehrkernige Platin(ii)- Und (III)-Komplexe


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About the Book

Die vorliegende Arbeit gliedert sich in vier Teile. Der erste Teil beschaftigt sich mit den DNA-Bindungseigenschaften von verschiedenen zweikernigen Platin(II)-Komplexen, die uber aromatische Liganden verbruckt sind. Dabei wird besonderes Augenmerk auf die Bindung an eine d(GNG)-Sequenz innerhalb von DNA gelegt, wobei N fur eine beliebige, in der DNA vorkommende Base und G fur Guanin steht. Durch Gelelektrophorese-Studien konnte gezeigt werden, dass alle untersuchten Pt-Komplexe in doppelstrangiger DNA mit der d(GGG)-Sequenz reagieren, wahrend die d(GNG)-Sequenzen, deren mittlere Base nicht Guanin ist, nur von einem der untersuchten Komplexe erkannt werden. Weiterhin wird in diesem Abschnitt die Umsetzung von Diplatin(III)-Komplexen mit Nukleobasen untersucht. Hierfur wurden zweikernige Platin(III)-Komplexe dargestellt und vollstandig charakterisiert. Die darauffolgende Umsetzung mit 9-Ethylguanin fuhrt zum Austausch beider axialer Liganden durch die Nukleobase, die an die Diplatin(III)-Einheit uber die N7-Position bindet. Da analoge Umsetzungen mit allen anderen Modellnukleobasen nicht zur Koordination an die Diplatin(III)-Einheit fuhrten, scheinen die untersuchten Komplexe selektiv Guaninbasen zu erkennen. Der zweite Teil der Arbeit beschreibt die Synthese einer amidverbruckten Platin-Palladium-Silber-Verbindung. Hierbei konnte ein Komplex mit mehreren strukturellen Besonderheiten charakterisiert werden. So liegen nebeneinander m-NH2-Brucken zwischen den Platin- und Palladiumatomen, sowie m-OH-Brucken zwischen zwei Platinatomen vor. Das zwolfkernige Kation bildet ein molekulares Rechteck, wobei zusatzlich direkte intermetallische Wechselwirkungen uber dative Ag-Pt-Bindungen auftreten. Im dritten Teil konnte nachgewiesen werden, dass die Koordination eines zweiwertigen Metallions an der Nukleobase die weitere Bindung von zweiwertigen Metallionen an die Phosphonatgruppe im 9-[2-(Phosphonomethoxy)ethyl]adenin (PMEA) nur unwesentlich beeinflusst. Die Bedeutung dieses Ergebnisses wird unter dem Gesichtspunkt der Beteiligung mehrerer Metallionen in einem enzymatischen Prozess oder einer Ribozymkatalyse diskutiert. Im letzten Teil der Arbeit wurden die Mikroaziditatskonstanten einiger Purine bestimmt und mit den Aziditatskonstanten von Platin-Komplexen dieser Purine verglichen."


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Product Details
  • ISBN-13: 9783897228283
  • Publisher: Logos Verlag Berlin
  • Publisher Imprint: Logos Verlag Berlin
  • Height: 210 mm
  • No of Pages: 221
  • Series Title: German
  • Sub Title: Darstellung, Substitutionsreaktionen Und Dna-Bindungsverhalten; Losungsstudien Zum Effekt Von Platin(ii) Auf Die Aziditat Und Die Metallbindungseige
  • Width: 145 mm
  • ISBN-10: 3897228289
  • Publisher Date: 15 Jan 2002
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 0 mm
  • Weight: 750 gr


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