Why is Benzene Unique? Screening Magnetic Properties of C6H6 Isomers


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Year of publication 2018
Type Article in Periodical
Magazine / Source ChemPhysChem
MU Faculty or unit

Central European Institute of Technology

Web https://onlinelibrary.wiley.com/doi/abs/10.1002/cphc.201800364
Doi http://dx.doi.org/10.1002/cphc.201800364
Keywords Potential energy surface scan; Aromaticity; Electronic energy; Magnetizability
Description Magnetic properties are commonly used to identify new aromatic molecules because it is generally believed that magnetization and energetic stability are correlated. To verify the potential correlation between the energy and magnetic response properties, we examined a set of 198 isomers of C6H6. The energy and magnetic properties of these molecules can be directly compared with no need to invoke any arbitrary reference state because the studied systems are all isomers. Benzene is the global minimum on the potential energy surface of C6H6, 35kcalmol(-1) lower in energy than the second most stable isomer, fulvene. Unlike its electronic energy, isotropic magnetizability of benzene is slightly lower than the average magnetizability of its isomers. Altogether, 44 isomers of C6H6 were identified to have more negative magnetic susceptibility than benzene but were between 67.0 to 168.6kcalmol(-1) higher in energy than benzene. However, benzene is unique in two ways. Analyzing the paramagnetic contribution to the magnetic susceptibility as originally suggested by Bilde and Hansen (Mol. Phys., 1997, 92, 237) revealed that 53molecules have lower paramagnetic susceptibility than benzene but among monocyclic systems benzene has the least paramagnetic susceptibility. Furthermore, benzene has the largest out-of-plane magnetic susceptibility that originates from the strongest ring current among all studied species.
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