A three-dimensional tin(II) phosphonatobenzenesulfonate with Sn4O12 clusters

Area of Science:

• Inorganic Chemistry
• Materials Science
• Crystallography

Background:

• Tin(II) compounds are of interest due to their diverse coordination chemistry and potential applications.
• Hydrothermal synthesis offers a versatile route for constructing complex inorganic structures.
• Organic ligands like phosphonated sulfonic acids can direct the assembly of metal-organic frameworks and coordination polymers.

Purpose of the Study:

• To synthesize and characterize a novel tin(II) coordination compound.
• To investigate the structural properties of the resulting material using X-ray diffraction.
• To explore the self-assembly behavior of tin(II) with a bifunctional organic linker.

Main Methods:

• Hydrothermal reaction of tin(II) chloride dihydrate (SnCl(2)·2H(2)O) with 4-phosphonobenzenesulfonic acid (H(3)L) and sodium hydroxide.
• Single-crystal X-ray diffraction analysis to determine the crystal structure.
• Analysis of the inorganic building units and their connectivity.

Main Results:

• The synthesis successfully yielded the title compound, poly[μ-hydroxido-μ(7)-(4-phosphonatobenzenesulfonato)-ditin(II)], [Sn(2)(C(6)H(4)O(6)PS)(OH)](n).
• The structure is characterized by an inorganic Sn(4)O(12) cluster composed of edge-sharing SnO(4) and SnO(5) polyhedra.
• These clusters form layered structures in the ab plane, interconnected by P and S atoms of the organic ligand.
• Pillaring benzene groups of the organic linker connect these layers, resulting in a three-dimensional framework.

Conclusions:

• A novel 3D coordination polymer of tin(II) has been successfully synthesized and structurally elucidated.
• The study demonstrates the utility of hydrothermal synthesis in creating complex tin-based materials.
• The observed structure highlights the role of the bifunctional organic linker in directing the formation of a robust 3D network.