Novel substituted series of aromatic copolymers was obtained by one-spot, metal-free super acid-catalyzed one-step polymerization of substituted isatin and phenothiazine. The polymerization reaction was performed at room temperature in the presence of Bronsted superacid (trifluoromethanesulfonic acid) and methylene chloride which condenses the compounds consists of carbonyl group (aldehydes and ketones) and aromatic rings to yield the polymers. Super acid catalyst has several advantages including the reaction proceeding at room temperature and great synthetic versatility. The obtained polymers have good solubility in common organic solvents. The polymers were purified by repeated precipitations with methanol. Polymers (P1–P3) were completely characterized by FT-IR, ¹H NMR, TGA, and UV–visible, fluorescence and cyclic voltammetry techniques. Polymers (P1–P3) possessed excellent thermal stability up to 300 °C and have absorbance and emission maximum at 557 and 630 nm, respectively. The optical and electrochemical properties of these polymers revealed that it could be one of the capable materials for applications in optoelectronic device and in the area of proton exchange membrane fuel cell.

中文翻译：

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吩噻嗪和修饰的靛红的超强酸催化聚合

通过取代的靛红和吩噻嗪的单点，无金属的超强酸催化一步聚合，获得了新型的芳香族共聚物取代系列。聚合反应在室温下在布朗斯台德超强酸（三氟甲磺酸）和二氯甲烷的存在下进行，该冷凝使由羰基（醛和酮）和芳环组成的化合物缩合，得到聚合物。超强酸催化剂具有几个优点，包括在室温下进行反应和合成的多功能性。所获得的聚合物在普通有机溶剂中具有良好的溶解性。通过用甲醇重复沉淀来纯化聚合物。FT-IR完全表征了聚合物（P1-P3），¹H NMR，TGA和紫外可见，荧光和循环伏安技术。聚合物（P1-P3）在高达300°C的温度下具有出色的热稳定性，并且分别在557 nm和630 nm处具有最大吸收和发射。这些聚合物的光学和电化学性质表明，它可能是光电器件和质子交换膜燃料电池领域应用的能力之一。