FTIR of thiophene monomer and polythiophene,,,, just i want study after polymerization of thiophene how we can confirm by FTIR?
Better you try UV spectrum wherein you will get red shift due to extended conjugation obtained by virtue of polymerization. Compare the wavength of absorption maximum with one obtained using Woodward fieser rule. FTIR will have similar vibrational frequencies for monomer and polymer.
Will ask a friend if she has such spectra for classic thiophene / PTh rather than for the 3-hexyl derivative.
If you want to confirm that a polymer was prepared, UV would be perfectly reasonable, as Shrikaant Kulkarni mentioned above. One possible issue (and method of verifying!) is that unsubstituted polythiophene is insoluble and infusible, so depending on the form, in which the polymer precipitated from the reaction system, the difficulty of acquiring a good UV-Vis spectrum may vary.
If, for example, you produced the polymer via an electrochemical process (anodic polymerisation from a thiophene solution), the polymer will precipitate as a film on the working electrode - a simple CV scan should be sufficient to confirm its formation (the shape is widely reported in literature; for an ad-hoc confirmation, the evolution of peaks at lower potentials than the oxidation of the monomer should be sufficient).
FT-IR is indeed probably not the best method to characterize these 2 compounds as discussed above.
In general, FT-IR spectra of many compounds are available for free on the website of Sigmaaldrich. For example for thiophene:
https://www.sigmaaldrich.com/spectra/rair/RAIR014284.PDF
Dear Ahsan Nazir,
On pages: 852-856 of the attached book, the wave lengths of Polythiophene have been identified in a table. In the attached article the FTIR analysis of thiophene and Polythiophene have been shown.
I hope it would be useful.
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