Multi-State VALBOND for Atomistic Simulations of Hypervalent Molecules, Metal Complexes, and Reactions

Schmid, Maurus H. and Das, Akshaya Kumar and Landis, Clark R. and Meuwly, Markus. (2018) Multi-State VALBOND for Atomistic Simulations of Hypervalent Molecules, Metal Complexes, and Reactions. Journal of Chemical Theory and Computation, 14 (7). pp. 3565-3578.

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Official URL: https://edoc.unibas.ch/94217/

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The implementation, validation, and application of the multi-state VALBOND method for transition-metal-containing and hypervalent molecules are presented. This approach is particularly suited for molecules with unusual shapes and systems that need to be described by a superposition of resonance structures, each of which satisfies the octet rule. The implementation is based on the original VALBOND force field and allows us to smoothly switch between resonance structures, each of which can be characterized by its own force field, including varying charge distributions and coupling terms between the states. The implementation conserves total energy for simulations in the gas phase and in solution and is applied to a number of topical systems. For the small hypervalent molecule ClF 3 , the barrier for pseudorotation is found to be 4.3 kcal/mol, which compares favorably with the experimentally measured value of 4.8 kcal/mol. A transition-metal-containing complex, cisplatin, is characterized by six resonance states, for which the vibrational spectrum is found to be in good agreement with experiment. Finally, umbrella sampling simulations of the S N 2 reaction BrMe + Cl - → Br - + MeCl in solution yield a barrier height of 24.6 kcal/mol, in good agreement with experiment (24.7 kcal/mol).
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Physikalische Chemie (Meuwly)
UniBasel Contributors:Meuwly, Markus
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:03 Apr 2023 11:34
Deposited On:03 Apr 2023 09:14

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