Theoretical Study of Helix Formation in Substituted Phenylene Ethynylene Oligomers
- 24 October 2003
- journal article
- Published by American Chemical Society (ACS) in The Journal of Organic Chemistry
- Vol. 68 (23) , 8780-8785
- https://doi.org/10.1021/jo034827y
Abstract
Theoretical investigations of the relative stabilities of helical vs extended forms of phenylene ethynylene oligomers established that MMFF molecular mechanics was more useful than AM1 or DFT for calculating helical structures and for estimating relative energies. At the level of MMFF, theory predicts that for o- or m-oligophenylene ethynylenes, helix formation is enthalpically favored for ester and ether-substituted oligomers. In contrast to simple electron-demand predictions, we predict that the position of substituents can make a substantial difference in the tendency to form helices.Keywords
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