Organotin chalcogenide salts: synthesis, characterization, and extended crystal structures

Area of Science:

• Inorganic Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Tin-chalcogenide compounds are of interest due to their diverse structures and potential applications.
• Defect heterocubane and anionic polymer structures offer unique properties.
• Controlling the self-assembly of inorganic clusters and polymers is a key challenge.

Purpose of the Study:

• To synthesize and characterize novel tin-chalcogenide anionic clusters and polymers.
• To investigate the influence of chalcogen identity (Se, Te, S) and stoichiometry on the resulting structures.
• To explore the formation of defect heterocubane and infinite anionic polymer architectures.

Main Methods:

• Reactions of tin precursors (Cl(3)SnR(1)H) with sodium chalcogenides (Na(2)E, E = Se, Te, S) in liquid ammonia or acetone/water mixtures.
• Characterization of the resulting anionic salts and polymers using appropriate analytical techniques (e.g., X-ray diffraction, elemental analysis).
• Stoichiometric control of reactants to direct the formation of different structural motifs.

Main Results:

• Reaction with Na(2)Se and Na(2)Te in liquid ammonia yielded anionic defect heterocubane [(RSn)(3)Se(4)](-) and anionic polymer (infinity)(1)[(R(1)Sn)(2)Te(3)(2-)], respectively.
• In acetone/water, a 1:1.5 ratio of tin precursor to Na(2)S produced [(R(1)Sn)(3)S(4)](2-).
• A 1:2 ratio of tin precursor to Na(2)S resulted in the formation of the anionic polymer (infinity)(1)[(R(1)Sn)(2)S(3)(2-)], which is isostructural to the telluride polymer.

Conclusions:

• The synthesis provides access to novel anionic tin-chalcogenide heterocubanes and polymers.
• The chalcogen element and reaction stoichiometry are critical factors in determining the final structure.
• The observed structures highlight the versatility of tin in forming complex anionic frameworks.