Mapping the modification of ring currents induced by cyclopenta-fusion on a naphthalene core
Abstract
An analysis of the σ-, π- and total current density maps, calculated using a distributed-origin coupled Hartree–Fock method, of the non-alternant cyclopenta-fused polycyclic aromatic ]fluoranthene (4) shows that, whereas the presence of a single pentagon in 1 and 3 has only minor effects on the core naphthalene unit, the strong cooperative effect of the two pentagons connected by a formal double bond in 2 and 4 results in intense paratropic currents in the pentagons, and markedly reduced aromaticity according to conventional criteria. The accuracy of the all-electron maps is supported by calculation of 1H and