Twist Sense Bias Induced by Chiral Side Chains in Helically Folded Oligomers.
Cooperative interactions among the side chains of the helically folded phenylene-ethynylene oligomer shown (n=2, 4, 6, 8, 10, 12, 14, 16, 18) can induce a twist sense bias. Therefore, the side chains can play more than just an ancillary role in these conformationally ordered oligomers. The onset of the twist sense bias lags significantly behind the appearance of helical conformations, possibly because a large ensemble of "collapsed" conformations is initially formed.
Prince
RB
The Department of Chemistry and Materials Science and Engineering, The University of Illinois 600 South Mathews Avenue, Urbana, IL 61801 (USA) and The Beckman Institute for Advanced Science and Technology 405 North Mathews Avenue, Urbana, IL 61801 (USA).
Brunsveld
L
Meijer
EW
Moore
JS