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1 H and 13 C NMR study of regioregular head‐to‐tail oligo(octylthiophene)s and poly(octylthiophene)
Author(s) -
Bras Jérôme,
PépinDonat Brigitte
Publication year - 2001
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/1097-458x(200102)39:2<57::aid-mrc799>3.0.co;2-q
Subject(s) - random hexamer , chemistry , proton , proton nmr , dimer , carbon 13 nmr , relaxation (psychology) , polymer , dispersity , polymer chemistry , crystallography , stereochemistry , organic chemistry , psychology , social psychology , physics , quantum mechanics
The 1 H and 13 C signals of the aromatic region of monodisperse regioregular head‐to‐tail (HT) oligo(octylthiophene)s ranging from the dimer to the hexamer were assigned in CDCl 3 and THF‐ d 8 . The linear dependence of proton chemical shifts on the reciprocal number of thiophenes was demonstrated in both solvents. Weak signals surrounding the main peak in the spectrum of the regioregular HT poly(octylthiophene) were assigned in CDCl 3 and THF‐ d 8 in the light of results obtained for the hexamer. In particular, the end of chain protons of the polymer could be assigned. Spin–lattice relaxation times ( T 1 ) of aromatic protons of the hexamer were measured in CDCl 3 and THF‐ d 8 . We observed that T 1 depended on the position of the proton along the main chain. This result was interpreted in terms of molecular motions. Copyright © 2001 John Wiley & Sons, Ltd.