10.1021/ja027437m.s001
Kenji Matsuda
Kenji
Matsuda
Matthew T. Stone
Matthew T.
Stone
Jeffrey S. Moore
Jeffrey S.
Moore
Helical Pitch of <i>m</i>-Phenylene Ethynylene Foldamers by Double Spin Labeling
American Chemical Society
2002
radical
helical
ethyl acetate solvents
measurement
Phenylene Ethynylene Foldamers
ethynylene
label
Spin
oligo
chloroform
conformation
ESR spectra
oligomer
Helical
analysis
phenylene
Pitch
2002-09-14 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Helical_Pitch_of_i_m_i_-Phenylene_Ethynylene_Foldamers_by_Double_Spin_Labeling/3645027
To investigate the helical conformation of oligo(<i>m</i>-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.