Magnetic Resosnance Studies of Nano Phase Conducting Polyaniline
Polyaniline (PANI) was synthesized in Emaraldine form by in situ chemical oxidation method by using Ammonium perdisulphate as oxidizing agent. The XRD pattern indicates that PANI is a semi crystalline solid with d-spacing 4.801 and 4.358 Ǻ. The SEM results show that the particle size lies as an average of 80 nm and length 550 nm. Similarly the UV-Visible spectra of this polymer indicate two absorption bands at around 320 nm and 640 nm. These absorption bands are attributed to the transitions of π → π* and Benzenoid to Quinoid respectively. The FT-IR spectrum of PANI shows strong bands at 3,442, 2,925, 1,598, 1,494, 1,453, 1,176, 1,112 and 744 cm−1 respectively. 1H NMR spectrum shows 6 peaks with chemical shifts δ = 7.452, 7.468, 7.505, 7.525, 7.604, 7.638 ppm. The lower three peaks at (δ = 7.452, 7.468, 7.505 ppm) are attributed to the protons related to the 14N nucleus. These spectral lines intensity ratio lies as 1:1:1. Another three peaks at (δ = 7.525, 7.604, 7.638 ppm) are attributed to the three protons, which are present at CH Benzenoid, NH, CH at Quinoid. The intensity ratio of these spectral lines is 1:2:1. The room temperature ESR spectrum of PANI Emeraldine salt shows an unresolved peak with lande’s g factor 2.010 due to polarons.
KeywordsPANI XRD UV-visible NMR ESR
The authors are thankful to the Head Department of Physics, Osmania University, Hyderabad, India for providing laboratory facilities.
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