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Volume 7, Issue 2
Energy Near-Degeneracy Driven Covalency Analyzed by a Two-Electron Two-Orbital Model

Michael Dolg

Commun. Comput. Chem., 7 (2025), pp. 161-170.

Published online: 2025-06

[An open-access article; the PDF is free to any online user.]

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A simple model based on the two-electron two-orbital textbook problem is presented and used to analyze pairwise interatomic interactions in metal-ligand bonding. In particular the two types of covalency discussed during the last decade for actinide-ligand interactions, overlap/interaction driven and energy-near-degeneracy driven covalency, as well as their influence on the bond strengths and interatomic charge build-up are discussed. The hydration complexes ${\rm M}({\rm H}_2{\rm O})^{4+}_n$ of selected tetravalent lanthanide and actinide ions are used to probe the performance of the model for an analysis of calculations as well as for predictions.

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@Article{CiCC-7-161, author = {Dolg , Michael}, title = {Energy Near-Degeneracy Driven Covalency Analyzed by a Two-Electron Two-Orbital Model}, journal = {Communications in Computational Chemistry}, year = {2025}, volume = {7}, number = {2}, pages = {161--170}, abstract = {

A simple model based on the two-electron two-orbital textbook problem is presented and used to analyze pairwise interatomic interactions in metal-ligand bonding. In particular the two types of covalency discussed during the last decade for actinide-ligand interactions, overlap/interaction driven and energy-near-degeneracy driven covalency, as well as their influence on the bond strengths and interatomic charge build-up are discussed. The hydration complexes ${\rm M}({\rm H}_2{\rm O})^{4+}_n$ of selected tetravalent lanthanide and actinide ions are used to probe the performance of the model for an analysis of calculations as well as for predictions.

}, issn = {2617-8575}, doi = {https://doi.org/10.4208/cicc.2025.99.01}, url = {http://global-sci.org/intro/article_detail/cicc/24186.html} }
TY - JOUR T1 - Energy Near-Degeneracy Driven Covalency Analyzed by a Two-Electron Two-Orbital Model AU - Dolg , Michael JO - Communications in Computational Chemistry VL - 2 SP - 161 EP - 170 PY - 2025 DA - 2025/06 SN - 7 DO - http://doi.org/10.4208/cicc.2025.99.01 UR - https://global-sci.org/intro/article_detail/cicc/24186.html KW - bonding, covalency, actinides, lanthanides. AB -

A simple model based on the two-electron two-orbital textbook problem is presented and used to analyze pairwise interatomic interactions in metal-ligand bonding. In particular the two types of covalency discussed during the last decade for actinide-ligand interactions, overlap/interaction driven and energy-near-degeneracy driven covalency, as well as their influence on the bond strengths and interatomic charge build-up are discussed. The hydration complexes ${\rm M}({\rm H}_2{\rm O})^{4+}_n$ of selected tetravalent lanthanide and actinide ions are used to probe the performance of the model for an analysis of calculations as well as for predictions.

Dolg , Michael. (2025). Energy Near-Degeneracy Driven Covalency Analyzed by a Two-Electron Two-Orbital Model. Communications in Computational Chemistry. 7 (2). 161-170. doi:10.4208/cicc.2025.99.01
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