The Electrochemical Synthesis of Polycationic Clusters

Area of Science:

• Inorganic Chemistry
• Electrochemistry
• Materials Science

Background:

• Chalcogen clusters are of interest for their unique structures and properties.
• Synthesis of polycationic chalcogen clusters often involves harsh conditions or specific counterions.

Purpose of the Study:

• To present a novel electrochemical method for synthesizing tellurium polycationic clusters.
• To isolate and characterize new tellurium cluster compounds with weakly coordinating anions.

Main Methods:

• Electrochemical dissolution of elemental tellurium in ionic liquids (ILs) and liquid sulfur dioxide (SO2).
• Isolation and characterization of tellurium cluster compounds using techniques like NMR spectroscopy.
• Density Functional Theory (DFT) calculations to investigate cluster structure and dynamics.

Main Results:

• Successful synthesis of [Te4][CTf3]2, [Te6][OTf]4, and [Te8][NTf2]2.
• Isolation of novel square [Te4](2+), prismatic [Te6](4+), and barrelane-shaped [Te8](2+) clusters.
• DFT calculations revealed a fluxional structure and fast valence isomerism in the [Te8](2+) cluster.

Conclusions:

• Electrochemical synthesis in ILs and SO2 provides a versatile route to novel tellurium polycationic clusters.
• The use of weakly coordinating anions leads to new cluster compositions.
• The [Te8](2+) cluster exhibits dynamic behavior in solution.