Substituent effects in the so-called cation p interaction of benzene and its boron-nitrogen doped analogues: overlooked role of r-skeleton

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10404365" target="_blank" >RIV/00216208:11320/19:10404365 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9wKEc0Mqo5" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9wKEc0Mqo5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c8cp04962a" target="_blank" >10.1039/c8cp04962a</a>

Result language

angličtina

Original language name

Substituent effects in the so-called cation p interaction of benzene and its boron-nitrogen doped analogues: overlooked role of r-skeleton

Original language description

Despite massive efforts to pinpoint the substituent effects in the so-called cation systems, no consensus has been yet reached on how substituents exercise their effects in the interaction of the aromatic molecule with the metal ion. The -polarization (the Hunter model) and the direct local effect (the Wheeler-Houk model) are two lines of thought applied to this problem, but the justification of both approaches is based on insufficiently proven assumptions and approximations. In order to shed more light on this issue we propose a new approach which enables us to gauge directly the energetic trends resulting from the interaction of the ring with the cation. In our method we add one more partitioning level to the interacting quantum atoms (IQA) scheme and decompose the IQA interaction energies into contributions resulting from sigma and electron densities of the aromatic ring. The new approach, which is named partitioned-IQA, abbreviated as p-IQA, has been applied to complexes of derivatives of benzene or azaborine interacting with a sodium cation. The p-IQA approach reveals that in these systems both sigma and electronic moieties are polarized. Interestingly, for the majority of cases the sigma-polarization outweighs the one, contrary to the Hunter model. However, the Wheeler-Houk model is not precise, either, since the sigma-polarization shows some degree of non-locality. In addition, the substituents are found to have a negligible influence on the ring orbital-overlapping capability, i.e. the covalency. Therefore, the substituent effect in the cation interaction is a nonlocal classical effect, indicating that neither Hunter model nor Wheeler-Houk model is able to fully describe all the aspects of the substituent effects. The p-IQA conclusions for the considered systems have been compared with the results from the functional-group SAPT (F-SAPT) method. We believe that the presented partitioning in the IQA framework will provide a deeper insight into the substituent effects in the cation interactions, which is beyond the sigma- atomic charge population separation.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

—

Continuities

R - Projekt Ramcoveho programu EK

Publication year

2019

Confidentiality

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

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

—

Volume of the periodical

21

Issue of the periodical within the volume

12

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

6453-6466

UT code for WoS article

000462649400010

EID of the result in the Scopus database

2-s2.0-85063290869