Is it mandatory to maintain inert atmosphere for Poly3-hexylthiophene (P3HT) synthesis through oxidative coupling using ferric chloride as catalyst ?

13 September 2023 1 5K Report

I am synthesizing P3HT by oxidative polymerization of 3-Hexylthiophene by using FeCl3 as catalyst. While going through the relevant literature, I came to know that polymerization has to be conducted in the inert atmosphere (N2 or Ar). But, I couldn't understand the exact reason for doing so. Can someone help me with this?

Any insights is much appreciated. Thank you!

Yuri Mirgorod

Sunil Vasu

.FeCl3 is not oxidized by atmospheric oxygen. However, in your reaction it will act as a weak oxidizing agent at the double bonds to allow polymerization to occur. Without an inert gas, the oxidation of thiophene by atmospheric oxygen can proceed through sulfur, which will lead to a deterioration in the polymerization reaction.

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