Assessment of scalar relativistic effects on halogen bonding and σ‐hole properties

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F20%3A43920256" target="_blank" >RIV/60461373:22340/20:43920256 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1002/qua.26392" target="_blank" >https://doi.org/10.1002/qua.26392</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/qua.26392" target="_blank" >10.1002/qua.26392</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Assessment of scalar relativistic effects on halogen bonding and σ‐hole properties

Popis výsledku v původním jazyce

Halogen bond (X‐bond) is a noncovalent interaction between a halogen atom and an electron donor. It is often rationalized by a region of the positive electrostatic potential on the halogen atom, so‐called σ‐hole. The X‐bond strength increases with the atomic number of the halogen involved; thus, for heavier halogens, relativistic effects become of concern. This poses a challenge for the quantum chemical description of X‐bonded complexes. To quantify scalar relativistic effects (SREs) on the interaction energies and σ‐hole properties, we have performed highly accurate coupled‐cluster calculations at the complete basis set limit of several X‐bonded complexes and their halogenated monomers. We found that the SREs are comparable in magnitude to the effect of the basis set. The nonrelativistic calculations typically underestimate the attraction by up to 5% or 23% for brominated and iodinated complexes, respectively. Counterintuitively, the electron densities at the bond critical points are larger for SRE‐free calculations than for the relativistic ones. SREs yield smaller, flatter, and more positive σ‐holes. Finally, we highlight the importance of diffuse functions in the basis sets and provide quantitative arguments for using basis sets with pseudopotentials as an affordable alternative to a more rigorous Douglas‐Kroll‐Hess relativistic theory.

Název v anglickém jazyce

Assessment of scalar relativistic effects on halogen bonding and σ‐hole properties

Popis výsledku anglicky

Halogen bond (X‐bond) is a noncovalent interaction between a halogen atom and an electron donor. It is often rationalized by a region of the positive electrostatic potential on the halogen atom, so‐called σ‐hole. The X‐bond strength increases with the atomic number of the halogen involved; thus, for heavier halogens, relativistic effects become of concern. This poses a challenge for the quantum chemical description of X‐bonded complexes. To quantify scalar relativistic effects (SREs) on the interaction energies and σ‐hole properties, we have performed highly accurate coupled‐cluster calculations at the complete basis set limit of several X‐bonded complexes and their halogenated monomers. We found that the SREs are comparable in magnitude to the effect of the basis set. The nonrelativistic calculations typically underestimate the attraction by up to 5% or 23% for brominated and iodinated complexes, respectively. Counterintuitively, the electron densities at the bond critical points are larger for SRE‐free calculations than for the relativistic ones. SREs yield smaller, flatter, and more positive σ‐holes. Finally, we highlight the importance of diffuse functions in the basis sets and provide quantitative arguments for using basis sets with pseudopotentials as an affordable alternative to a more rigorous Douglas‐Kroll‐Hess relativistic theory.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Quantum Chemistry

ISSN

1097-461X

e-ISSN

—

Svazek periodika

120

Číslo periodika v rámci svazku

23

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

"e26392-1"-"e26392-12"

Kód UT WoS článku

000561182600001

EID výsledku v databázi Scopus

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