title: A spectroscopic rule from the solvatochromism of aromatic solutes in nonpolar solvents.
abstract: The UV-vis absorption spectroscopy for a series of selected symmetrical aromatic hydrocarbons, benzene, naphthalene, anthracene, 9,10-diphenylanthracene, perylene, and rubrene in the gas phase or in 2-methylbutane, shows the consistency of a new spectroscopic rule. From a thorough spectroscopic analysis with temperature variation (293-113 K) this rule states that "an aromatic molecule, on Franck-Condon excitation can hardly generate an excited electronic state with a lower polarizability than that of its ground electronic-state." We have not found any exceptions to this rule.
authors.affiliation: Departamento de Química Física Aplicada, Universidad Autónoma de Madrid , Cantoblanco, E-28049 Madrid, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Catalán
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Del Valle