Composition-driven archetype dynamics in polyoxovanadates

Area of Science:

• Inorganic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Molecular metal oxides commonly exhibit stable structural archetypes.
• Adaptability and transformations between archetypes are key for advanced material design.
• Polyoxovanadates (POVs) are a class of metal oxides with diverse structural possibilities.

Purpose of the Study:

• To investigate the transformation pathways of polyoxovanadates (POVs) using arsenate and vanadate building units.
• To explore the synthesis of novel POV structures with varying nuclearity and morphology.
• To develop a new model for understanding the continuous evolution of POV assemblies.

Main Methods:

• Integrated systems thinking approach combining synthetic, analytical, and computational techniques.
• Synthesis and characterization of low and high nuclearity polyoxovanadate clusters.
• Solution-phase studies to observe in situ transformations of POV anions.

Main Results:

• The low nuclearity [V6As8O26]4- anion transforms into higher nuclearity clusters in solution, contrary to typical polyoxometalate (POM) behavior.
• Synthesis of spherical (kegginoidal) [V12As8O40]4- and tubular cyclic [V10As12O40]8- POVs.
• Demonstration of facile transformations between different POV structural archetypes.

Conclusions:

• A conceptually new model for POV self-assembly, describing continuous evolution between spherical and cyclic structures, has been established.
• This work advances the rational design of polyoxovanadate self-assemblies for specific applications.
• The findings challenge conventional understanding of POM stability in solution and highlight the dynamic nature of POV chemistry.