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Hydroxyl group as a substituent with varying electronic properties: effect of strength of H-bonding on charge density changes in Ph-OH…F- complexes.
Autorzy
Rok wydania
2011
Czasopismo
Numer woluminu
17
Strony
125-131
DOI
10.1007/s00894-010-0703-y
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Due to gradual and controlled changes of interatomic distances between heavy atoms in OH…F− of C6H5OH…F− systems it was possible to study the electronic structure evolution. Computation at B3LYP/6-311+G(d,p) level of theory was performed for this purpose. Changes in charges at atoms and characteristics at bond critical points (BCPs) of the H-bond region and also in distant parts of the systems were investigated by means of natural bond orbitals (NBO) and atoms in molecules (AIM) analyses. It is shown that at the border line between partially covalent and non-covalent H-bonding (Espinosa et al. in J Chem Phys 117:5529, 2002; Grabowski et al. in J Phys Chem B 110:6444, 2006) with the H…F interatomic distance ∼1.8 Ǻ the hydrogen atom has the most positive charge. In addition, the change in the atomic charge values in the interacting region affects the phenyl ring properties. The decrease of the sum of atomic charges as well as of the aromaticity was noticed when the OH….F distance is shortened.
Słowa kluczowe
AIM, Electronic properties, Intermolecular hydrogen bond, NBO
Adres publiczny
http://dx.doi.org/10.1007/s00894-010-0703-y
Strona internetowa wydawcy
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