An icosahedral Ta12(2+) cluster with spherical aromaticity.

Area of Science:

• Computational Chemistry
• Materials Science
• Quantum Chemistry

Background:

• Bare metal clusters are crucial in catalysis and materials science.
• Understanding cluster stability and electronic structure is key to their application.
• Icosahedral structures are often associated with high stability in clusters.

Purpose of the Study:

• To investigate the stability and electronic properties of a novel icosahedral tantalum cluster.
• To confirm the presence of spherical aromaticity in the Ta12(2+) cluster.
• To provide theoretical evidence for experimental verification.

Main Methods:

• Density Functional Theory (DFT) framework for electronic structure calculations.
• Analysis of symmetry, bond lengths, vibrational frequencies, HOMO-LUMO gap, and NICS(0) values.
• Quantum Theory of Atoms in Molecules (QTAIM) and Electron Localization Function (ELF) for electron density topological analyses.

Main Results:

• Identification of a high-stability icosahedral cluster, Ta12(2+).
• Confirmation of spherical aromaticity through multiple electronic and structural indicators.
• Ta12(2+) is the first bare metal cluster with 58 valence electrons exhibiting these properties.
• Evidence of three-center shared interactions within the icosahedral structure.

Conclusions:

• The icosahedral Ta12(2+) cluster demonstrates remarkable stability and spherical aromaticity.
• Theoretical simulations of IR and absorption spectra provide a pathway for experimental validation.
• This discovery advances the understanding of electronic structure and bonding in novel metal clusters.