title: An insight into the local aromaticities of polycyclic aromatic hydrocarbons and fullerenes.
abstract: In this work we quantify the local aromaticity of six-membered rings in a series of planar and bowl-shaped polycyclic aromatic hydrocarbons (PAHs) and fullerenes. The evaluation of local aromaticity has been carried out through the use of structurally (HOMA) and magnetically (NICS) based measures, as well as by the use of a new electronically based indicator of aromaticity, the para delocalization index (PDI), which is defined as the average of all the Bader delocalization indices between para-related carbon atoms in six-membered rings. The series of PAHs selected includes C(10)H(8), C(12)H(8), C(14)H(8), C(20)H(10), C(26)H(12), and C(30)H(12), with benzene and C(60) taken as references. The change in the local aromaticity of the six-membered rings on going from benzene to C(60) is analyzed. Finally, we also compare the aromaticity of C(60) with that of C(70), open [5,6]- and closed [6,6]-C(60)NH systems, and C(60)F(18).
authors.affiliation: Institut de Química Computacional and Departament de Química Universitat de Girona, 17071 Girona, Catalonia, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Poater
authors.forename: Xavier
authors.initials: X
authors.lastname: Fradera
authors.forename: Miquel
authors.initials: M
authors.lastname: Duran
authors.forename: Miquel
authors.initials: M
authors.lastname: Solà
mesh_terms: D004583:Electrons; D037741:Fullerenes / Q000737:chemistry*; D008958:Models, Molecular; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*
chemical_list: D037741:Fullerenes; D011084:Polycyclic Aromatic Hydrocarbons