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Bonding in mercury-alkali molecules: Orbital-driven van der Waals complexes
Elfi Kraka1, Dieter Cremer1,2
1Department of Chemistry, University of the Pacific, 3601 Pacific Avenue, Stockton, CA 95211, USA.
International Journal of Molecular Sciences
|March 28, 2009
Summary
This study explores bonding in mercury-alkali molecules (HgA), revealing them as orbital-driven van der Waals complexes. These findings aid in understanding alkali metal amalgam properties.
Area of Science:
- Physical Chemistry
- Quantum Chemistry
- Spectroscopy
Background:
- Mercury-alkali diatomics (HgA) exhibit van der Waals interactions.
- Understanding their bonding is crucial for materials science and chemical physics.
Purpose of the Study:
- Investigate the bonding in HgA ((2)Sigma(+)) molecules (A = Li, Na, K, Rb).
- Explain bonding trends using a theoretical model.
- Relate findings to alkali metal amalgams.
Main Methods:
- Employed the relativistic all-electron Normalized Elimination of the Small Component (NESC) method.
- Utilized Coupled Cluster with Singles and Doubles (CCSD(T)) calculations.
- Applied augmented Valence Triple Zeta (VTZ) basis sets.
Main Results:
- Calculated D(e) values for HgA molecules.
- Explained D(e) trends using a 3-electron 2-orbital model.
- Identified HgA as orbital-driven van der Waals complexes.
Conclusions:
- The bonding in HgA is governed by orbital interactions.
- Results provide insights into the behavior of liquid alkali metal amalgams.
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