Structure, fragmentation patterns, and magnetic properties of small cobalt oxide clusters

Area of Science:

• Physical Chemistry
• Materials Science
• Computational Chemistry

Background:

• The stoichiometry and stability of metal oxide clusters are crucial for understanding their properties.
• Previous experiments indicated favorable 1:1 stoichiometry and O2 loss in cobalt oxide clusters.

Purpose of the Study:

• To investigate the geometric, electronic, and magnetic properties of neutral and cationic cobalt oxide clusters (Co(n)O(m)(0/+)).
• To computationally validate experimental findings on cluster stability and fragmentation patterns.

Main Methods:

• Density functional calculations using the generalized gradient approximation.
• Optimization of various initial cluster geometries.
• Analysis of fragmentation patterns by comparing energy separations of potential fragments (O2, CoO, etc.).

Main Results:

• Computational results align with experimental observations: favorable 1:1 stoichiometry and O2 molecule loss as the primary fragmentation channel.
• The Co4O4(+) cluster is computationally confirmed as exceptionally stable.
• Detailed study of magnetic properties and spin isomeric configurations for (CoO)n(+) clusters.

Conclusions:

• Density functional theory calculations successfully replicate experimental findings regarding cobalt oxide cluster stability and stoichiometry.
• The study provides insights into the electronic and magnetic characteristics of these clusters, particularly Co4O4(+).