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Relationships Between Defectivity and Porosity in High Surface Area Porous Aromatic Frameworks
Anthony J Porath1, Tony Lybrand1, James R Bour1
1Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA.
Angewandte Chemie (International Ed. in English)
|November 30, 2023
Summary
Synthesizing porous aromatic frameworks (PAFs) effectively requires understanding how synthesis methods impact their structure. This study reveals that higher defectivity in PAFs, influenced by the synthetic pathway, leads to reduced surface area and pore volume.
Area of Science:
- Materials Science
- Chemistry
Background:
- Microporosity in porous aromatic frameworks (PAFs) is crucial for applications but highly sensitive to synthesis methods.
- The precise reasons why certain synthetic routes yield more porous PAFs remain unclear.
Purpose of the Study:
- To investigate the relationship between synthetic pathways, defectivity, and microporosity in PAFs.
- To elucidate the mechanisms controlling PAF porosity based on synthesis and defect formation.
Main Methods:
- Employed a network disassembly strategy to analyze PAF structure and defect formation.
- Systematically introduced defects into a model PAF to quantify their impact on porosity.
Main Results:
- Demonstrated that PAF defectivity is strongly dependent on the chosen synthetic approach.
- Observed a clear inverse correlation between PAF defectivity and measured surface area/pore volume.
- Confirmed that increased defect concentration significantly reduces surface area and pore volume.
Conclusions:
- Highly efficient coupling reactions are essential for synthesizing ultra-high surface area PAFs.
- Minimizing defects during synthesis is critical for maximizing PAF porosity and performance.
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