The first 3-dimensional assemblies of organotin-functionalized polyanions

Area of Science:

• Inorganic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Keggin polytungstates are versatile inorganic anions with tunable properties.
• Organotin compounds offer unique reactivity and structural motifs.
• The templating role of cations is crucial in constructing complex inorganic frameworks.

Purpose of the Study:

• To synthesize and characterize novel 3D organotin-functionalized poly tungstate compounds.
• To investigate the structural features and assembly of these new materials.
• To explore the formation of dimethyltin-containing tungstosilicate structures.

Main Methods:

• Reaction of dimethyltin electrophile with trilacunary Keggin polytungstates.
• Crystallization using guanidinium as a templating cation.
• Characterization of the resulting isostructural compounds (1-3) including structural analysis.

Main Results:

• Successful synthesis of three isostructural compounds: Na[C(NH(2))(3)](2)[{(CH(3))(2)Sn(H(2)O)}(3)(A-alpha-XW(9)O(34))] (X = P, As, Si).
• These compounds represent the first 3D assemblies of organotin-functionalized polyanions.
• Compound 3 is the first example of a dimethyltin-containing tungstosilicate, showcasing a chiral architecture.
• The structures feature tetrahedrally arranged building blocks connected by intermolecular Sn-O=W bridges.

Conclusions:

• The study reports the first 3D organotin-functionalized poly tungstate assemblies.
• A novel chiral architecture was achieved, independent of the heteroatom in the Keggin unit.
• The findings open new avenues for designing complex inorganic-organic hybrid materials.