Nitric oxide chemisorption in a postsynthetically modified metal-organic framework

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are porous materials with diverse applications.
• Nitric oxide (NO) is a crucial signaling molecule with therapeutic potential.
• Controlling NO binding and release is essential for its applications.

Purpose of the Study:

• To develop a postsynthetic modification strategy for MOFs to enable controlled nitric oxide (NO) binding.
• To investigate the reaction of derivatized MOFs with NO and characterize the resulting species.
• To compare the NO binding behavior of modified MOFs with their parent counterparts.

Main Methods:

• Postsynthetic modification of a parent MOF to introduce secondary amine functionalities.
• Exposure of the derivatized MOF to nitric oxide (NO) gas.
• Characterization of the modified MOF and the NO adducts using techniques such as spectroscopy and gas adsorption analysis.

Main Results:

• The postsynthetically derivatized MOF successfully reacted with nitric oxide (NO).
• The reaction formed N-diazenium diolates, indicating a distinct NO binding mode.
• In contrast to the parent MOF, which binds NO irreversibly, the derivatized MOF exhibits a potentially reversible interaction.

Conclusions:

• Postsynthetic derivatization of MOFs offers a viable route to introduce specific functionalities for gas interactions.
• The formation of N-diazenium diolates provides a novel mechanism for NO interaction within MOFs.
• This approach opens possibilities for developing MOF-based materials for NO storage, delivery, or sensing applications.