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Published on: December 6, 2021
Electronic structure of cobalt carbide, CoC
Demeter Tzeli1, Aristides Mavridis
1Laboratory of Physical Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, P.O. Box 64 004, 157 10 Zografou, Athens, Greece.
The Journal of Physical Chemistry. A
|July 14, 2006
Summary
Researchers studied cobalt carbide (CoC) electronic states using advanced computational methods. The ground state is confirmed as 2Sigma+ symmetry, with a dissociation energy of 83 kcal/mol, aligning with experimental data.
Area of Science:
- Computational Chemistry
- Quantum Chemistry
- Molecular Spectroscopy
Background:
- Diatomic molecules like cobalt carbide (CoC) are crucial in materials science and astrochemistry.
- Understanding the electronic structure and bonding of transition metal carbides is essential for predicting their properties.
Purpose of the Study:
- To computationally investigate the ground and low-lying excited electronic states of the CoC molecule.
- To accurately determine spectroscopic constants, dissociation energies, and bonding characteristics.
Main Methods:
- Multireference configuration interaction (MRCI) methods were employed for electronic structure calculations.
- Quantitative basis sets were utilized to ensure high accuracy.
- Potential energy curves, Mulliken distributions, and valence-bond-Lewis diagrams were analyzed.
Main Results:
- All 19 calculated states of CoC are found to be bound.
- The ground state is identified as 2Sigma+ symmetry, with a 2Delta state lying very close in energy (<3 kcal/mol).
- The calculated dissociation energy (De) for the ground state is 83(82) kcal/mol at an equilibrium bond distance of 1.541 Å.
Conclusions:
- The computational findings strongly support experimental observations regarding the ground state symmetry and energy of CoC.
- The study provides a comprehensive set of molecular constants and insights into the bonding of CoC.
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