Investigation of poly(arylenevinylene)s, 24. High-resolution solid-state 13C NMR spectroscopy of poly(1,4-phenylenevinylene)s

High-resolution ¹³C NMR spectra of solid poly(1,4-phenylenevinylene), poly(1,4-phenylene-1,2-diphenylvinylene) and of three related, substituted polymers (? CN, ? OCH₃, ? O? ) were obtained with a combined technique of heteronuclear decoupling, cross-polarization and magic angle spinning. The reported chemical shifts were assigned by means of solid model compounds (trans-stilbene, trans, trans-1,4-distyrylbenzene, tetraphenylethylene). Utilizing the high sensitivity of ¹³C NMR chemical shifts to chemical structure, this method is applied to structure confirmation, the determination of sp³-defects in poly(phenylenevinylene)s PPV, and the determination of sterical and electronical effects of phenyl and phenylene groups.