The catalytic performance study of polyindole as a heterogeneous catalyst is reported for the synthesis of 3,3’-arylmethylene-bis-1H-Indole derivatives using various substituted aldehydes and indole under reflux reaction condition with good to excellent yield. Polyindole was synthesized by chemical oxidative polymerization using citric acid as a dopant. The synthesized polymer was well characterized by various spectroscopic techniques like FT-IR, XRD, FESEM, etc. The XRD pattern confirms the partially crystalline nature of polyindole. The FESEM images of polyindole revealed the formation of irregularly shaped particulate nature with size in the range of 0.2 to 6 micron. In FT-IR spectrum, the major peak at ∼ 3400 cm−1 indicates N-H stretching and at 1564 −1624 cm −1 indicates C-C stretching of benzenoid ring of indole. The presence of peak at ∼ 3400 cm−1 indicates that the polymerization does not occur at nitrogen. The present protocol has certain advantages like recyclability, low loading of the catalyst, low-cost and efficient use of polyindole as a heterogeneous catalyst.
报告了聚
吲哚作为异相催化剂在回流反应条件下合成3,3'-芳基亚甲基-双1H-
吲哚衍
生物的催化性能研究,使用了多种取代醛和
吲哚,获得了良好到优异的产率。聚
吲哚是通过
化学氧化聚合合成的,使用
柠檬酸作为掺杂剂。合成的聚合物通过FT-IR、XRD、FE
SEM等多种光谱技术进行了良好的表征。XRD图谱确认了聚
吲哚的部分结晶特性。FE
SEM图像显示聚
吲哚形成了不规则形状的颗粒,尺寸范围为0.2到6微米。在FT-IR光谱中,约3400 cm−1处的主要峰指示N-H伸展,1564-1624 cm−1处的峰则指示
吲哚苯环的C-C伸展。约3400 cm−1处的峰的存在表明聚合未发生在氮上。本协议具有一些优点,如可重复使用、催化剂负载量低、成本低以及聚
吲哚作为异相催化剂的高效利用。