Thorium(IV)-selenate clusters containing an octanuclear Th(IV) hydroxide/oxide core.

Area of Science:

• Inorganic Chemistry
• Materials Science
• Computational Chemistry

Background:

• Thorium hydroxide/oxide clusters are of interest for their unique structural motifs and potential applications.
• Understanding the assembly and properties of these polynuclear complexes is crucial for advancing coordination chemistry.

Purpose of the Study:

• To synthesize and structurally characterize novel Thorium(IV) hydroxide/oxide clusters.
• To investigate the structural diversity and common building blocks within these clusters.
• To computationally predict the acid-base properties and stability of these Thorium clusters.

Main Methods:

• Synthesis of Thorium(IV) hydroxide/oxide clusters from aqueous solutions.
• Single crystal X-ray diffraction for detailed structural determination.
• Raman spectroscopy for material characterization.
• Density Functional Theory (DFT) calculations for geometry, vibrational frequencies, and energy predictions.

Main Results:

• Four Thorium(IV) hydroxide/oxide clusters were synthesized and structurally elucidated, featuring an octanuclear core ([Th(8)O(4)(OH)(8)](16+)) as a common building block.
• Structural variations arise from differences in hydration and selenate coordination, leading to distinct extended structures.
• DFT calculations showed good agreement with experimental data and predicted the acid-base properties and relative stability of various Thorium cluster species in aqueous solution.

Conclusions:

• The study successfully synthesized and characterized novel Thorium(IV) clusters, highlighting a recurring octanuclear motif.
• Hydration and anion coordination play key roles in dictating the final extended structures.
• Computational predictions provide valuable insights into the acid-base behavior and stability of these complex Thorium systems.