Structural and Gas Uptake Studies on Iron(II) β‑Diketiminate Metallomacrocycles

Area of Science:

• Inorganic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Metallomacrocycles are coordination compounds with cyclic structures containing metal ions.
• Metal-organic frameworks (MOFs) are known for their porous structures and adsorption properties.
• Investigating the adsorption properties of novel metallomacrocycles can lead to new materials for gas storage and separation.

Purpose of the Study:

• To synthesize and characterize novel iron-containing metallomacrocycles.
• To investigate the solid-state structures and adsorption properties of these metallomacrocycles.
• To determine if these metallomacrocycles exhibit characteristics of mesoporous materials.

Main Methods:

• Synthesis of iron metallomacrocycles with varying amide coligands.
• Characterization using single crystal X-ray crystallography.
• Investigation of adsorptive properties using N2 gas physisorption at 77 K.

Main Results:

• Three distinct iron metallomacrocycles were successfully synthesized, containing three, four, or six iron centers.
• The metallomacrocycles formed extended solid-state structures resembling MOFs.
• Nitrogen adsorption-desorption isotherms revealed Type II isotherms for three metallomacrocycles, indicating mesoporosity.

Conclusions:

• The synthesized iron metallomacrocycles possess extended structures with tunable iron content.
• These metallomacrocycles exhibit mesoporous characteristics, evidenced by N2 adsorption data.
• The findings suggest potential applications for these materials in areas such as gas adsorption and separation.