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Stacking interactions of resonance-assisted hydrogen-bridged rings and C6-aromatic rings

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2020
Authors
Filipović, Jelena P. Blagojević
Hall, Michael B.
Zarić, Snežana D.
Article (Published version)
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Abstract
Stacking interactions between six-membered resonance-assisted hydrogen-bridged (RAHB) rings and C6-aromatic rings were systematically studied by analyzing crystal structures in the Cambridge Structural Database (CSD). The interaction energies were calculated by quantum-chemical methods. Although the interactions are stronger than benzene/benzene stacking interactions (-2.7 kcal mol-1), the strongest calculated RAHB/benzene stacking interaction (-3.7 kcal mol-1) is significantly weaker than the strongest calculated RAHB/RAHB stacking interaction (-4.7 kcal mol-1), but for a particular composition of RAHB rings, RAHB/benzene stacking interactions can be weaker or stronger than the corresponding RAHB/RAHB stacking interactions. They are also weaker than the strongest calculated stacking interaction between five-membered saturated hydrogen-bridged rings and benzene (-4.4 kcal mol-1) and between two five-membered saturated hydrogen-bridged rings (-4.9 kcal mol-1). SAPT energy decomposition ...analyses show that the strongest attractive term in RAHB/benzene stacking interactions is dispersion, however, it is mostly canceled by a repulsive exchange term; hence the geometries of the most stable structures are determined by an electrostatic term.

Source:
Physical Chemistry Chemical Physics, 2020, 22, 24, 13721-13728
Publisher:
  • Royal Society of Chemistry
Projects:
  • Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200168 (University of Belgrade, Faculty of Chemistry) (RS-200168)
Note:
  • Supplementary material: https://cherry.chem.bg.ac.rs/handle/123456789/4079

DOI: 10.1039/d0cp01624a

ISSN: 1463-9076

WoS: 000542478100037

Scopus: 2-s2.0-85087096113
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URI
http://cherry.chem.bg.ac.rs/handle/123456789/4060
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