3 years ago

Electron affinity of modified benzene

Electron affinity of modified benzene
Purusottam Jena, Nicholas Driver
The electron affinities of organic molecules obeying Hückel's rule of aromaticity are vanishingly small, if not negative. For example, benzene, a classic example of an aromatic molecule, has an electron affinity of −1.15 eV. Using density functional theory, we have systematically calculated the electron affinities and vertical detachment energies of C6H6 by substituting H with halogen (F) and superhalogen (BO2) moieties, as well as replacing one of the C atoms with B. The ground state geometries were obtained by examining about 330 isomers. The electron affinities are found to steadily increase with these substitutions/replacements, even surpassing that of Cl, the element with the highest electron affinity in the periodic table, in the case of C5BH(BO2)5. In some special cases such as C6H5(BO2) the electron affinity and vertical detachment energy differ by as much as 5 eV, indicating substantial changes in the geometry as the electron is removed from the anion. We hope that the ability to change the negative electron affinity of C6H6 to large positive values by substituting H and/or replacing C atom will motivate experimental studies. Superhalogens are materials of increasing interest thanks their potential use in novel designs of Li-Ion batteries. Using density functional theory, the electron affinities and vertical detachment energies of numerous modified benzene molecules, including C6F6 and C6(BO2)6, are calculated. To further increase electron affinity of this molecules, Huckel's Rule for aromaticity has been employed, yielding an organic, aromatic superhalogen molecule: BC5H(BO2)5.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/qua.25504

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