Poly[[diaqua(mu3-2,2-dimethylmalonato)cadmium(II)] tetrahydrate]

Area of Science:

• Coordination Chemistry
• Materials Science
• Crystallography

Background:

• Metal-organic frameworks (MOFs) offer tunable structures for diverse applications.
• Understanding the role of solvent molecules in MOF assembly is crucial.
• Cadmium-based MOFs are explored for their unique structural properties.

Purpose of the Study:

• To synthesize and characterize a novel dimethylmalonate-cadmium complex.
• To investigate the co-existence of MOF and extended water structures.
• To identify the formation of sodalite-type water clusters within the MOF.

Main Methods:

• Single-crystal X-ray diffraction to determine the crystal structure.
• Infrared spectroscopy for functional group analysis.
• Powder X-ray diffraction for phase purity confirmation.

Main Results:

• The crystal structure reveals a 2D honeycomb layer of cadmium dimethylmalonate.
• An extended sodalite-type framework formed by water molecules is observed.
• The complex {[Cd(C(5)H(6)O(4))(H(2)O)(2)].4H(2)O}(n) is characterized, showing truncated sodalite units.
• This is the first reported dimethylmalonate cadmium complex with sodalite-type water clusters.

Conclusions:

• A novel cadmium-based MOF with an integrated sodalite-type water framework has been successfully synthesized.
• The findings highlight the potential for designing MOFs with specific guest molecule arrangements.
• This work expands the understanding of water's role in MOF structural diversity.