The synthesis and properties of triple-helical hybrids containing non-nucleosidic polyaromatic building blocks are described. Clamp-type oligonucleotides containing a non-nucleosidic pyrene linker form stable triple helices with a polypurine target strand containing a terminal pyrene or phenanthrene moiety. Stacking interactions between the unnatural building blocks enhance triplex stability and lead to strong excimer or exciplex formation, which is monitored by fluorescence spectroscopy.
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