Solution 1H NMR Confirmation of Folding in Short o-Phenylene Ethynylene Oligomers
Journal of the American Chemical Society2005Vol. 127(49), pp. 17235–17240
Citations Over TimeTop 17% of 2005 papers
Abstract
Oligomers based on an o-phenylene ethynylene (oPE) backbone with polar substituents have been synthesized using Sonogashira methods. Folding of these extremely short oligomers was confirmed via 1D and 2D (NOESY) NMR methods. Utilizing electron-rich and electron-poor phenylene building blocks, variations of these oPE oligomers have been synthesized to determine the folded stability of pi-rich vs pi-poor vs pi-rich-pi-poor systems. Slight variations in temperature offer a route, aside from solvent denaturation, to probe the stability of the folded structure. This is the first report of an NMR solution characterization of folding for a PE backbone without hydrogen bonds.
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