862903-83-1Relevant academic research and scientific papers
Folding and anion-binding properties of fluorescent oligoindole foldamers
Kim, Uk-Il,Suk, Jae-Min,Naidu, Veluru Ramesh,Jeong, Kyu-Sung
experimental part, p. 11406 - 11414 (2009/12/01)
A series of oligoindole foldamers 1a-d that are highly fluorescent were prepared by using a biindole derivative as the repeating unit, and their folding and anion-binding properties were revealed by 1H NMR and fluorescence spectroscopy. The oli
Oligoindole-based foldamers with a helical conformation induced by chloride
Chang, Kyoung-Jin,Kang, Byung-Nam,Lee, Min-Hee,Jeong, Kyu-Sung
, p. 12214 - 12215 (2007/10/03)
As a new type of foldamers, oligoindoles containing 4, 6, and 8 indole rings were synthesized, and their folding properties were characterized by a combination of 1H NMR techniques and UV/visible titration experiments. When chloride was added, the NH signals of the oligoindoles were downfield shifted as a result of hydrogen-bond formation, and the aromatic signals were upfield shifted by stacking between two indoles. Moreover, the ROESY experiment provided definitive NOE evidence for the helical stacking in the presence of chloride. Finally, the UV/visible titration experiments demonstrated that the oligoindoles formed 1:1 complexes with chloride, and the association constants greatly increased with increasing the number of the indole NHs. These observations are all consistent with the fact that oligoindoles adopt a helical conformation when complexed with chloride by hydrogen-bonding interactions. Copyright
