Ultrastable Imine-Based Covalent Organic Frameworks for Sulfuric Acid Recovery: An Effect of Interlayer Hydrogen Bonding

Arjun Halder, Suvendu Karak, Matthew Addicoat, Saibal Bera, Amit Chakraborty, Shebeeb H. Kunjattu, Pradip Pachfule, Thomas Heine, Rahul Banerjee

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123 Citations (Scopus)


A rapid and scalable synthesis of six new imine-linked highly porous and crystalline COFs is presented that feature exceptionally high chemical stability in harsh environments including conc. H2SO4 (18 m), conc. HCl (12 m), and NaOH (9 m). This is because of the presence of strong interlayer C−H⋅⋅⋅N hydrogen bonding among the individual layers, which provides significant steric hindrance and a hydrophobic environment around the imine (−C=N−) bonds, thus preventing their hydrolysis in such an abrasive environment. These COFs were further converted into porous, crystalline, self-standing, and crack-free COF membranes (COFMs) with extremely high chemical stability for their potential applications for sulfuric acid recovery. The as-synthesized COFMs exhibit unprecedented permeance for acetonitrile (280 Lm−2 h−1 bar−1) and acetone (260 Lm−2 h−1 bar−1).

Original languageEnglish
Pages (from-to)5797-5802
Number of pages6
JournalAngewandte Chemie - International Edition
Issue number20
Publication statusPublished - 2018 May 14

Bibliographical note

Funding Information:
A.H. & S.B. acknowledge CSIR and S.K. acknowledges UGC, India for research fellowships. A.C. thanks SERB NPDF (PDF/2015/000622) for a fellowship. We acknowledge Himad-ri S. Sasmal for single crystal data collection. R.B. acknowledges DST Indo-Singapore Project (INT/SIN/P-05) and DST Nanomission Project (SR/NM/NS-1179/2012 G) for funding. We acknowledge Dr. T. G. Ajithkumar & Anjali Krishna M. for the NMR and Dr. C. Ramesh & Dr. K. Guruswamy for PXRD facility.

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)


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