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• W2006408828 abstract "Five different pure density functional theory (DFT) and hybrid Hartree−Fock/DFT methods have been used to search for the molecular structures, thermochemistry, and electron affinities of the bromine hydrogen fluorides HBrFn/HBrFn- (n = 2, 4). The basis sets used in this work are of double-ζ plus polarization quality in conjunction with s- and p-type diffuse functions, labeled as DZP++. Structures with Br−F and Br−H normal bonds, that is, HBrF2/HBrF2- with C2v or Cs symmetry and HBrF4/HBrF4- with C4v or Cs symmetry, are genuine minima. However, unlike the original BrF3 and BrF5 molecules, the global minima for HBrFn/HBrFn- (n = 2, 4) species are predicted to be complexes, some of which contain hydrogen bonds. The demise of the hypervalent structures is due to the availability of favorable dissociation products involving HF, which has a much larger dissociation energy than F2. Similar reasoning suggests that PF4H, SF3H, SF5H, ClF2H, ClF4H, AsF4H, SeF3H, and SeF5H will all be hydrogen bond structures incorporating diatomic HF. The most reasonable theoretical values of the adiabatic electron affinities (EAad) are 3.69 (HBrF2) and 4.38 eV (HBrF4) with the BHLYP method. These electron affinities are comparable to those of the analogous molecules: Br2Fn, ClBrFn, and BrFn+1 systems. The first F-atom dissociation energies for the neutral global minima are 60 (HBrF2) and 49 kcal/mol (HBrF4) with the B3LYP method. The first H-atom dissociation energies for the same systems are 109 (HBrF2) and 116 kcal/mol (HBrF4). The large Br−H bond energies are not sufficient to render the hypervalent structures energetically tenable. The dissociation energies for the complexes to their fragments are relatively small." @default.
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• W2006408828 date "2004-10-21" @default.
• W2006408828 modified "2023-10-18" @default.
• W2006408828 title "Hypervalency Avoided: Simple Substituted BrF₃ and BrF₅ Molecules. Structures, Thermochemistry, and Electron Affinities of the Bromine Hydrogen Fluorides HBrF₂ and HBrF₄" @default.
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• W2006408828 doi "https://doi.org/10.1021/ja040110w" @default.
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