In-situ polymerized polyaniline films. Preparation in solutions of hydrochloric, sulfuric, or phosphoric acid

Polyaniline: The infrared spectroscopy of conducting polymer nanotubes (IUPAC Technical Report)

“…10), are attributed to hydrogen-bonded N-H stretching [23,[28][29][30][31] and aromatic C-H stretching [32][33][34], respectively (Fig. 3, Table 4).…”

Improving the electrochemical properties of polyaniline by co-doping with titanium ions and protonic acid

“…Additional evidence of weakened hydrogen bonding is that the relative intensities of the "H-peaks" was lower than that of others in the region of 2000-500 cm −1 . Moreover, a new peak at 3212 cm −1 was observed in PAn-Ti, as in some other polyaniline salts [33,39].…”

“…This means that the titanium ions are always preferentially bonded with the imine nitrogen atoms. (2) The absorption peaks in the range of 3400-2800 cm −1 , usually called "H-peaks", are assigned to hydrogen bonding involving amines (-NH-) and protonated imines ( NH + ) between the regularly aligned polyaniline chains [28,39]. Fig.…”

A peculiar cyclic voltammetric behavior of polyaniline in acetonitrile and its application in ammonia vapor sensor

“…Generally, the interchain hydrogen bonding can stabilize the bipolaronic structure, limiting the charge delocalization [19]. Moreover, the adsorption peaks at 3207, 3137, 3050, 2901 and 2823 cm À1 , named H-peaks, may reflect mainly the hydrogen bonding [21]. It was reported that the peaks at 3137 and 2960 cm À1 in the spectra of PANI salts disappeared after chemical conversion of the films to the bases, which was attributed to the destruction of the inter-chain hydrogen bonding induced by the deprotonation [21,22].…”

“…Moreover, the adsorption peaks at 3207, 3137, 3050, 2901 and 2823 cm À1 , named H-peaks, may reflect mainly the hydrogen bonding [21]. It was reported that the peaks at 3137 and 2960 cm À1 in the spectra of PANI salts disappeared after chemical conversion of the films to the bases, which was attributed to the destruction of the inter-chain hydrogen bonding induced by the deprotonation [21,22]. In addition, the low vibration energy peak at 2823 cm À1 is observable when the inter-chain hydrogen bonding exists [22,23].…”