In situ infrared spectroscopy of oligoaniline intermediates created under alkaline conditions

0438333 - ÚMCH 2015 RIV US eng J - Článek v odborném periodiku
Šeděnková, Ivana - Stejskal, Jaroslav - Trchová, Miroslava
In situ infrared spectroscopy of oligoaniline intermediates created under alkaline conditions.
Journal of Physical Chemistry B. Roč. 118, č. 51 (2014), s. 14972-14981. ISSN 1520-6106. E-ISSN 1520-5207
Grant CEP: GA ČR GAP205/12/0911
Institucionální podpora: RVO:61389013
Klíčová slova: aniline oligomers * microspheres * aniline oxidation
Kód oboru RIV: CD - Makromolekulární chemie
Impakt faktor: 3.302, rok: 2014

The progress of the oxidation of aniline with ammonium peroxydisulfate in an alkaline aqueous medium has been monitored in situ by attenuated total reflection (ATR) Fourier transform infrared spectroscopy. The growth of the microspheres and of the film at the ATR crystal surface, as well as the changes proceeding in the surrounding aqueous medium, are reflected in the spectra. The evolution of the spectra and the changes in the molecular structure occurring during aniline oxidation in alkaline medium are discussed with the help of differential spectra. Several processes connected with the various stages of aniline oxidation were distinguished. The progress of hydrolysis of the aniline in water and further an oxidation of aminophenol to benzoquinone imines in the presence of peroxydisulfate in alkaline medium have been detected in the spectra in real time. The precipitated solid oxidation product was analyzed by mass spectrometry. It is composed of oligomers, mainly trimers to octamers, of various molecular structures incorporating in addition to aniline constitutional units also p-benzoquinone or p-benzoquinoneimine moieties.
Trvalý link: http://hdl.handle.net/11104/0242536