Niobium and Tantalum Halocyanide Clusters: The Complete Family

Area of Science:

• Inorganic Chemistry
• Materials Science
• Computational Chemistry

Background:

• Niobium (Nb) and tantalum (Ta) halide clusters are important precursors in materials science.
• Developing efficient synthetic routes to functionalized clusters is crucial for exploring their properties.

Purpose of the Study:

• To develop straightforward synthetic procedures for niobium and tantalum halide clusters featuring terminal cyanide ligands.
• To investigate the structural, electrochemical, electrostatic, electronic, and topological properties of these novel clusters.

Main Methods:

• Ligand-exchange reactions using various niobium and tantalum halide precursors and cyanide sources.
• Isolation of products as tetrabutylammonium (Bu4N) salts.
• Experimental characterization and quantum chemical calculations.

Main Results:

• Successful synthesis of [M6X12(CN)12]4- (M = Nb, Ta; X = Cl, Br) clusters in moderate to high yields (50-80%).
• Detailed investigation revealing correlations between structural, electrochemical, electrostatic, electronic, and topological features.
• Systematic analysis of how metal type, halide, and charge influence cluster properties.

Conclusions:

• Established efficient synthetic methodologies for a family of Nb and Ta cyanide halide clusters.
• Provided comprehensive insights into the structure-property relationships of these metal clusters.
• Demonstrated the utility of combined experimental and computational approaches for characterizing complex inorganic compounds.