Abstract
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.
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 and FESEM, etc. The XRD pattern confirms polyindole to be partially crystalline. The performance of polyindole as a heterogeneous catalyst has been studied 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.
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Acknowledgements
Authors sincerely acknowledge ISRO, University of Pune for financial assistance. We also thank Centre for Materials for Electronic technology (C-MET) and Haribhai V. Desai College for characterization and Nowrosjee Wadia College, Pune for providing lab facilities.
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Additional information related to characterization of the catalyst and synthesized compounds (XRD, SEM, FT-IR, 1HNMR and 13CNMR) are given in the supporting information and are available at http://www.ias.ac.in/Journals/Journal_of_Chemical_Sciences.
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CHHATTISE, P., HANDORE, K., HORNE, A. et al. Synthesis and characterization of Polyindole and its catalytic performance study as a heterogeneous catalyst. J Chem Sci 128, 467–475 (2016). https://doi.org/10.1007/s12039-016-1040-1
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DOI: https://doi.org/10.1007/s12039-016-1040-1