Quasi-planar Co atom-doped boron cluster: CoB₁₉²

Area of Science:

• Computational chemistry
• Materials science
• Quantum chemistry

Background:

• Understanding the structural and electronic properties of transition metal-boron clusters is crucial for developing novel materials.
• Cobalt-boron clusters are of interest due to their potential catalytic and electronic applications.

Purpose of the Study:

• To determine the lowest energy structure of the CoB₁₉^2- cluster.
• To investigate the electronic structure and bonding characteristics within the cluster.

Main Methods:

• Global structure search using computational methods.
• Density Functional Theory (DFT) calculations to determine the ground state structure.
• Wave function analysis to understand bonding interactions.

Main Results:

• The ground state structure of CoB₁₉^2- is quasi-planar, featuring a central cobalt atom within a B₈ ring.
• The cobalt atom exhibits a +1 oxidation state and a d⁸ electron configuration.
• Co-B interactions are non-covalent, with stronger peripheral B-B bonds compared to inner ones. The B₈ ring interacts with outer boron atoms via σ- and π-bonds.

Conclusions:

• CoB₁₉^2- exhibits significant aromatic character, indicating unique electronic delocalization.
• The findings challenge conventional bonding theories and highlight novel bonding motifs in metal-boron clusters.