Solid-State Synthesis of Poly(3',4'-dimethoxy-2,2':5',2"- terthiophene): Comparison With Poly(terthiophene) and Poly(3',4'-ethylenedioxy-2,2':5',2"- terthiophene)
作者:Tursun Abdiryim、Ruxangul Jamal、Aminam Ubul、Ismayil Nurulla
DOI:10.3390/molecules17078647
日期:——
A new terthiophene monomer: 3',4'-dimethoxy-2,2':5',2"-terthiophene (TMT) was synthesized and characterized by 1H-NMR, 13C-NMR and FTIR. The solid-state oxidative polymerizations of TMT were performed in various ratios of oxidant (FeCl3) to monomer (TMT). The resulting polymers were characterized by 1H-NMR, FTIR, UV-vis-NIR, GPC, X-ray diffraction, CV, as well as TGA and conductivity measurements. The structure and properties of poly (TMT) were compared with those of polyterthiophene [poly(TT)] and poly (3',4'-ethylenedioxy-2,2':5',2"-terthiophene) [poly(TET)] prepared under the same polymerization conditions. After comparative analysis with poly(TT) and poly(TET), the effects of the dimethoxy substituent and FeCl3 on the structural and physicochemical properties of the poly(TMT)s were discussed in depth. The comparison suggested that the dimethoxy-substituted polymer did not display higher crystallinity, thermal stability, conductivity and electrochemical activity than ethylenedioxy substituted one. The results also showed that the effect of FeCl3 on poly(TMT) was similar that seen with the poly(TT), in which the oxidation degree, electrochemical activity and conductivity increased steadily with increasing [FeCl3]/[TT] ratio. Furthermore, the poly(TMT) and poly(TT) are mostly made up of dimers with a small amount of higher molecular weight components.
一种新的三联噻吩单体:3',4'-二甲氧基-2,2':5',2"-三联噻吩(TMT)已经合成,并通过1H-NMR、13C-NMR和FTIR进行了表征。TMT的固态氧化聚合在氧化剂(FeCl3)与单体(TMT)的不同比例下进行。所得聚合物的表征方法包括1H-NMR、FTIR、UV-vis-NIR、GPC、X射线衍射、CV以及TGA和电导率测量。将聚(TMT)的结构和性质与在相同聚合条件下制备的聚三联噻吩(poly(TT))和聚(3',4'-乙二氧基-2,2':5',2"-三联噻吩)(poly(TET))进行了比较。与聚(TT)和聚(TET)进行比较分析后,深入讨论了二甲氧基取代基和FeCl3对聚(TMT)的结构和物理化学性质的影响。比较表明,二甲氧基取代的聚合物的结晶度、热稳定性、电导率和电化学活性并不比乙二氧基取代的聚合物高。结果还表明,FeCl3对聚(TMT)的影响与聚(TT)相似,其中氧化程度、电化学活性和电导率随着[FeCl