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|Title:||A quantitative molecular orbital perspective of the chalcogen bond|
|Keywords:||Activation strain model|
Density functional calculations
Energy decomposition analysis
|Citation:||SANTOS, L. de A. et al. A quantitative molecular orbital perspective of the chalcogen bond. ChemistryOpen, [S.l.], v. 10, n. 4, p. 389-390, Apr. 2021. DOI: 10.1002/open.202100066.|
|Abstract:||We have quantum chemically analyzed the structure and stability of archetypal chalcogen-bonded model complexes D2Ch⋅⋅⋅A− (Ch = O, S, Se, Te; D, A = F, Cl, Br) using relativistic density functional theory at ZORA-M06/QZ4P. Our purpose is twofold: (i) to compute accurate trends in chalcogen-bond strength based on a set of consistent data; and (ii) to rationalize these trends in terms of detailed analyses of the bonding mechanism based on quantitative Kohn-Sham molecular orbital (KS-MO) theory in combination with a canonical energy decomposition analysis (EDA). At odds with the commonly accepted view of chalcogen bonding as a predominantly electrostatic phenomenon, we find that chalcogen bonds, just as hydrogen and halogen bonds, have a significant covalent character stemming from strong HOMO−LUMO interactions. Besides providing significantly to the bond strength, these orbital interactions are also manifested by the structural distortions they induce as well as the associated charge transfer from A− to D2Ch.|
|Appears in Collections:||DQI - Artigos publicados em periódicos|
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