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Poly(ortho-phenylenediamine) and oligomers of ortho-phenylenediamine were chemically synthesized and characterized by UV–vis, 1 H and 13 C NMR, FTIR and resonance Raman spectroscopies. Polymerization of ortho-phenylenediamine in HCl medium with ammonium persulfate only leads the trimer compound, in disagreement with some previous reports. Nevertheless, in acetic acid medium it was...
The influence of molecular oxygen in the interactions of emeraldine base form of polyaniline (EB-PANI) with Fe(III) or Cu(II) ions in 1-methyl-2-pyrrolidinone (NMP) solutions has been investigated by UV–vis–NIR, resonance Raman and electron paramagnetic resonance (EPR) spectroscopies. Through the set of spectroscopic results it was possible to rationalize the role of O 2 and to construct a...
In situ resonance Raman spectroscopy was employed to correlate the blue, yellow, purple, and orange-brown colors with the organic species that appear in aqueous suspensions of benzidine and montmorillonite clay (BZ–MMT system) at several pHs. From pH 3 to 9, the radical cation of BZ (BZ + ), which is responsible for the blue suspension color (λ max ∼600nm), is the predominant species...
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