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Helical pitch of m-phenylene ethynylene foldamers by double spin labeling
Kenji Matsuda1, Matthew T Stone, Jeffrey S Moore
1Roger Adams Laboratory, Departments of Chemistry and Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Journal of the American Chemical Society
|October 3, 2002
Abstract:
To investigate the helical conformation of oligo(m-phenylene ethynylene)s, a pair of TEMPO spin labels were appended to the backbone. The two TEMPO radicals were separated by the four, five, and six repeating units. ESR spectra of the labeled oligomers were measured in chloroform and in ethyl acetate solvents in which the oligomers are disordered and folded, respectively. The measurement and analysis of ESR spectra revealed that six repeating units make one helical turn.