Jw. Connolly et al., STRUCTURE OF THE SOLUBLE LEWIS-ACID POLY(P-PHENYLENEBENZOBISTHIAZOLE)AND POLY(P-PHENYLENEBENZOBISOXAZOLE) COMPLEXES, Chemistry of materials, 8(1), 1996, pp. 54-59
The published postulated structures of the species present in aluminum
chloride containing nitromethane solutions of PBZT and PBO have been
reinvestigated. Consideration of previously reported and new Al-27 NMR
spectra indicate that the predominant species in solution are AlCl4-
and a cationic species containing aluminum bound to the nitrogen atoms
in the polymer repeat unit, which are formed by reaction of the neutr
al aluminum chloride complexed polymer. Calculational evidence is also
presented to support a 2:1 ratio of aluminum chloride to polymer repe
at unit in the neutral complex.