Helical Pitch of m-Phenylene Ethynylene Foldamers by Double Spin Labeling
- 14 September 2002
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 124 (40), 11836-11837
- https://doi.org/10.1021/ja027437m
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.Keywords
This publication has 12 references indexed in Scilit:
- A New Twist on the Helix-Coil Transition: A Non-Biological Helix with Protein-Like Intermediates and TrapsThe Journal of Physical Chemistry B, 2000
- Dipolar spectroscopy and spin alignment in electron paramagnetic resonanceChemical Physics Letters, 2000
- Foldamer-Based Molecular RecognitionJournal of the American Chemical Society, 2000
- Cooperative Conformational Transitions in Phenylene Ethynylene Oligomers: Chain-Length DependenceJournal of the American Chemical Society, 1999
- Nanoporous and mesoporous organic structures: new openings for materials researchChemical Society Reviews, 1999
- Exploiting the Helical Motif for Enhanced Nonlinear Optical Response: Hyperpolarizability of Substituted m-Phenylene OligomersJournal of the American Chemical Society, 1998
- Solvophobically Driven Folding of Nonbiological OligomersScience, 1997
- Five Generations of Nitroxyl-Functionalized DendrimersMacromolecules, 1997
- Synthesis and magnetic behaviour of polyradical: poly(1,3-phenyleneethynylene) with π-toporegulated pendant stable aminoxyl and imine N-oxide–aminoxyl radicalsJournal of Materials Chemistry, 1996
- Short alanine-based peptides may form 310-helices and not α-helices in aqueous solutionNature, 1992