A double basic Sr-amino containing MOF as a highly stable heterogeneous catalyst

Area of Science:

• Materials Science
• Catalysis
• Inorganic Chemistry

Background:

• Metal-organic frameworks (MOFs) offer tunable structures and properties for various applications.
• Alkaline earth metal-based MOFs are less explored as heterogeneous catalysts.
• The Knoevenagel condensation is a key reaction in organic synthesis.

Purpose of the Study:

• To synthesize and characterize a novel strontium-based MOF.
• To evaluate the catalytic performance of the new MOF in Knoevenagel condensation reactions.
• To investigate the influence of reaction conditions on the MOF's catalytic activity and stability.

Main Methods:

• Solvothermal synthesis of the strontium-MOF using 2-amino-1,4-benzenedicarboxylic acid.
• Structural characterization using X-ray diffraction and other techniques.
• Catalytic testing in Knoevenagel condensation, varying temperature and solvent.

Main Results:

• A 3D strontium-MOF with unidirectional channels was successfully synthesized.
• The MOF demonstrated significant basic catalytic activity in Knoevenagel condensation.
• Optimal reaction conditions were identified, showing enhanced catalytic performance.
• The MOF exhibited high thermal stability (up to 250 °C) and solvent resistance.

Conclusions:

• The novel strontium-MOF is a stable and highly active heterogeneous catalyst.
• Its catalytic performance surpasses conventional alkaline oxides in Knoevenagel condensation.
• The material shows excellent reusability over five catalytic cycles without loss of activity.