Fluorinated 2D covalent organic frameworks with <b>hcb</b> topology for selective C<sub>2</sub>H<sub>4</sub>/C<sub>3</sub>H<sub>6</sub> separation
Efficient separation of C<sub>2</sub>H<sub>4</sub>/C<sub>3</sub>H<sub>6</sub> is essential for downstream polymer production, yet remains industrially challenging. Porous materials offer an energy-efficient alternative to cryogenic distillation, with fluorinated frameworks showing promise due to their tunable polarity and strong host-guest interactions. Herein, two isoreticular 2D covalent organic frameworks (COFs), TpDf-COF and TpTf-COF, with <b>hcb</b> topology were synthesized <i>via</i> [3+3] imine condensation. TpTf-COF, bearing a higher fluorine content, exhibits an IAST selectivity of 9.14 for C<sub>2</sub>H<sub>4</sub>/C<sub>3</sub>H<sub>6</sub> at 298 K and 1 bar, outperforming TpDf-COF (6.57). GCMC simulations reveal that enhanced selectivity originates from increased pore polarity and strengthened C-H⋯F interactions with C<sub>3</sub>H<sub>6</sub>, highlighting the role of fluorination in modulating COF-based gas separation performance.
Authors
- Xinyu Luo (ORCID: https://orcid.org/0000-0001-7142-9507)
- Yongwu Peng (ORCID: https://orcid.org/0000-0003-4760-5173)
- Phạm Văn Hảo (ORCID: https://orcid.org/0009-0001-8329-1776)
- Jun Pan (ORCID: https://orcid.org/0000-0002-6879-7023)
- Wenjie Wei (ORCID: https://orcid.org/0000-0001-7501-5061)
- Jialiang Liu (ORCID: https://orcid.org/0000-0003-4723-136X)
- Sen Wang (ORCID: https://orcid.org/0009-0005-2988-4510)
Institutions
- Ningbo University (CN)
- Zhejiang University of Science and Technology (CN)
Publication Details
- Journal
- Chemical Communications
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5cc02252e
- Citations
- 2
- Primary Topic
- Covalent Organic Framework Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China