Structural assignment of conductive polymers by CP/MAS 13C-NMR

Intrinsically soluble copolymers with well-defined alternating substituted p-phenylenevinylene and ethylene oxide blocks

“…In contrast, the other carbon atoms of M and the copolymers all have very similar chemical surroundings. The assign-ments in the phenylenevinylene moieties follow those given by Nouwen et al 19 in an extensive NMR study of alkoxysubstituted PPV derivatives and by Yang et al20 in a HETCOR 2D-NMR study of M. The carbon atom shifts in the ethylene oxide blocks of the copolymers are assigned as were those in the dialdehyde monomers because of the great similarity in chemical shift values and the high degree of certainty of the dialdehyde assignment. The following conclusions can be drawn.…”

Determination of Molecular Orientational Order in Cold-Stretched Poly(p-phenylene vinylene) Thin Films by DECODER 13C NMR

“…These distinct positions with respect to the vinyl group result in different isotropic chemical shifts for these two pairs of carbon sites, leading to observed frequency differences between the two pairs of protonated aromatic carbons (C 2 and C 5 ; C 3 and C 6 ). Previous solid-state 13 C NMR studies have determined the isotropic 13 C chemical shifts of the different carbon sites in PPV to be 136; 131; 125; and 128 ppm for C 1;4 ; C 2;5 ; C 3;6 ; and C 7;8 ; respectively [37][38][39].…”