A comparative study on p-doping behavior of polythiophenes with CH3SO3H

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Four kinds of polythiophenes have been doped with CH3SO3H in CHCl3 under air,oxygen,and nitrogen. In the doping of two types of poly(3-hexylthiophene)s,P3HexTh(Zn/Ni)and P3HexTh(Fe)with different contents of a head-to-tail unit,the p-doping occurs at a similar rate.The reaction between poly(3-dodecylthiophene),P3DodTh,and the acid takes place more rapidly.P3OBuTh with a butoxy substituent undergoes more facile p-doping and receives photochemical reaction with CHCl3,and this reaction obeys a pseudo-first-order rate law with a rate constant kobs of 1.42×10-5s-1at room tempera- ture. In the doping of two types of poly (3-hexylthiophene) s, P3HexTh (Zn / Ni) and P3HexTh (Fe) with different contents of a head-to-tail unit, the p-doping occurs at a similar rate. The reaction between poly (3-dodecylthiophene), P3DodTh, and the acid takes place more rapidly. P3OBuTh with a butoxy-modified undergoes more facile p-doping and photochemical reaction with CHCl3, and this reaction obeys a pseudo-first-order rate law with a rate constant kobs of 1.42 × 10-5s-1at room tempera- ture.
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