Pyrazolate-Based Porphyrinic Metal-Organic Framework with Extraordinary Base-Resistance

Area of Science:

• Materials Science
• Chemistry

Background:

• Metal-organic frameworks (MOFs) offer tunable properties but often lack stability in harsh chemical environments.
• Porphyrinic MOFs are promising for various applications but their stability in alkaline media is limited.

Purpose of the Study:

• To design and synthesize a novel metal-organic framework (MOF) with exceptional stability in alkaline solutions.
• To investigate the base-resistance limits of porphyrinic MOFs in aqueous media.

Main Methods:

• Topological analysis for rational MOF design.
• Synthesis of a pyrazolate-based porphyrinic ligand and subsequent MOF construction (PCN-601).
• Stability testing in saturated sodium hydroxide solutions at room temperature and 100 °C.

Main Results:

• Successfully designed and synthesized PCN-601, a highly stable metal-organic framework.
• PCN-601 retains crystallinity and porosity in saturated sodium hydroxide (∼20 mol/L) at both room temperature and 100 °C.
• This represents a significant advancement in the base-resistance of porphyrinic MOFs.

Conclusions:

• PCN-601 demonstrates unprecedented stability in highly alkaline aqueous media.
• The findings push the boundaries of MOF stability and broaden their potential industrial and scientific applications.
• Further investigation into the thermodynamic and kinetic factors governing PCN-601's stability is warranted.