Diffusion Control in Single-Site Zinc Reticular Amination Catalysts.

Area of Science:

• Materials Science
• Catalysis
• Organic Chemistry

Background:

• Amination of C-Cl bonds is crucial in organic synthesis.
• Homogeneous zinc catalysts are effective but can be difficult to separate and reuse.
• Developing robust heterogeneous catalysts is essential for sustainable chemistry.

Purpose of the Study:

• To investigate Zn-containing metal-organic frameworks (MOFs) as heterogeneous catalysts for C-Cl bond amination.
• To compare the catalytic performance of MOFs with extended bis(pyrazolate) linkers to other MOFs and homogeneous catalysts.
• To assess the stability and reusability of the developed MOF catalysts.

Main Methods:

• Synthesis of highly porous Zn-containing MOFs using extended bis(pyrazolate) linkers.
• Characterization of the MOF structures and pore sizes.
• Testing the catalytic activity of the MOFs in the amination of C-Cl bonds.
• Comparison with existing homogeneous zinc amination catalysts.

Main Results:

• The Zn-reticular framework with N4Zn nodes demonstrated high catalytic activity in C-Cl bond amination.
• Highly porous architectures favored amine diffusion compared to MOFs with narrower pores.
• The MOF catalyst showed activity comparable to homogeneous catalysts.
• The catalyst exhibited long-term stability and reusability over multiple reaction cycles without product contamination.

Conclusions:

• Zn-containing MOFs are effective heterogeneous catalysts for C-Cl bond amination.
• The use of extended linkers creates porous structures beneficial for catalysis.
• These MOFs offer a sustainable alternative to homogeneous catalysts, operating under mild conditions.