Highs and Lows of Bond Lengths: Is There Any Limit?
| Autor: | J. Manuel Recio, Miguel A. Salvadó, Álvaro Lobato, Mercedes Taravillo, Valentín G. Baonza |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010402 general chemistry
01 natural sciences Molecular physics Catalysis Bond Theory Química física Limit (mathematics) Research Articles Physics 010405 organic chemistry Hydrogen bond potential energy curve Scalar (physics) General Chemistry General Medicine Potential energy Diatomic molecule Electron localization function 0104 chemical sciences Bond length Covalent bond hydrogen bonds bond length ELF (electron localization function) Research Article carbon–carbon bonds |
| Zdroj: | RUO. Repositorio Institucional de la Universidad de Oviedo instname E-Prints Complutense. Archivo Institucional de la UCM Angewandte Chemie (International Ed. in English) |
| Popis: | We argue that two distinct points on the potential energy curve (PEC) of a pairwise interaction, the zero‐energy crossing point and the point where the stretching force constant vanishes, allow to anticipate the range of possible distances one can expect between two atoms in diatomic, molecular moieties and crystalline systems. We show that these bond stability boundaries are unambiguously defined and correlate with topological descriptors of electron density‐based scalar fields, and we put forward a practical method to calculate them easily using generic PECs. Chemical databases and quantum‐mechanical calculations are used to analyze a full set of diatomic bonds of atoms from the s‐p main block. Emphasis is placed on the effect of substituents in C‐C covalent bonds, concluding that distances shorter than 1.14 Å or longer than 2.0 Å are unlikely to be achieved, in agreement with ultra‐high‐pressure data and transition state distances, respectively. Presumed exceptions, often due to changes in the reference state or ill‐defined dissociation energies (e.g. O 2 2+ ), are used to place our model in the correct framework and to formulate a conjecture for chained‐interactions, which offers a first explanation for the multimodal histogram of O‐H distances reported for hundreds of chemical systems. This work was supported by the Spanish National Research Agency (AEI) through projects PGC2018-094814-B-C21, PGC2018-094814-B-C22 and RED2018-102612-T, and Principado de Asturias FICYT under Project No. FC-GRUPINIDI/2018/000177. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|