Regiochemistry characterization of poly(3-hexanoyloxyethyl-2,5-thienylene) through proton and carbon nuclear magnetic resonance spectroscopy

A direct route to polythiophenes displaying lateral substituents: Easy one‐step synthesis and polymerization of thiophene monomers substituted by a dimethylenecarboxylate (CH2CH2COOR) appendage on the 3‐position

“…It is interesting to note that the relative position for the HT‐HT triad configuration among the four possible signals differs from those observed for poly(3‐alkylthiophene)s where the HT‐HT signal is always at the most upfield position among the four possibilities. However, it correlates with the spectrum reported for a regioirregular polythiophene displaying a CH 2 CH 2 OOC (CH 2 ) 4 CH 3 lateral substituent, which also had the HT‐HT signal in the second position when reading the spectrum according to rising δ values 35. This similarity suggests again that the effect arises from the long‐distance influence exerted by the ester group on the resonance of the thienyl protons in the polymer 32.…”

Π-Stacking Signature in NMR Solution Spectra of Thiophene-Based Conjugated Polymers

“…The second class of poorly solvatochromic polymers is formed by regiorandom polythiophenes 24,25,42,52−54 and by copolymers containing the fluorene moiety. 18,55 The 1 H NMR spectra of these polymers are characterized by quite narrow line widths and the absence of shielded broad signals in the aromatic region.…”

“…The second class of poorly solvatochromic polymers is formed by regiorandom polythiophenes ,,,− and by copolymers containing the fluorene moiety. , The 1 H NMR spectra of these polymers are characterized by quite narrow line widths and the absence of shielded broad signals in the aromatic region. This behavior can be explained by a low proneness of these polymers to form π-stacked aggregates and by a tendency toward a random coil conformation even in aggregates.…”

“…We have been studying conjugated polymers for the last two decades, and from the beginning, we devoted our interest also to the in-depth 1D and 2D NMR characterization of alkyl-( PAT ) and alkylsulfanyl-( PAST ) polythiophenes (Chart ) ,,− that some of us reviewed in 2002 . These studies were mainly aimed at the assessment of the regiochemistry and at the characterization of the minor configurational triads of polythiophenes.…”

Electronic Transitions of Polyalkylthiophenes Partially Derivatized with NLO Chromophores: A Theoretical and Experimental Study

“…In fact, a more intrinsic chromophore orientational order may be assumed for C 2 spacer-bearing copolymers because of their morerestricted movements with respect to the conjugated PT chain. [43][44][45] Moreover, the UV spectra show that copolymers P1 and P2 inhibit the setting up of high concentrations of A forms, so that in the high chromophoric absorption region the PT absorptions of the two copolymers are low. Therefore, the two absorption processes do not interfere very much with each other, which may favour NLO properties.…”