Aniline-1,4-benzoquinone as a model system for the characterization of products from aniline oligomerization in low acidic media

• Published in: Chemical physics letters Vol. 551; pp. 130 - 133
• Main Authors: Silva, Claudio H.B., Ferreira, Daniela C., Ando, Rômulo A., Temperini, Marcia L.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2012
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2012.09.033

[Display omitted] ► Oligoanilines are obtained by aniline-peroxydisulfate reaction in low acidic media. ► Aniline–benzoquinone (AnBzq) is a model system to characterize oligoanilines. ► A detailed assignment of IR and Raman bands of AnBzq system is proposed. ► The bichromophoric nature of AnBzq was revealed by Raman spectroscopy. Increase in the pH medium of aniline polymerization is used for giving products of different morphologies, which are often wrongly attributed to PANI chains. Infrared and Raman spectroscopic data, supported by quantum chemical calculations, show that aniline-1,4-benzoquinone (AnBzq) is a model system for the characterization of the products of aniline oligomerization in low acidic media. The Raman spectra excited at different laser lines reveal the bichromophoric nature of AnBzq, whose absorption bands at 550nm and 440nm can be attributed to π–π∗ transitions of the delocalized benzoquinone and amino-phenyl moieties, respectively.