title: Absorption spectra of 4-nitrophenolate ions measured in vacuo and in solution.
abstract: From blue to red: While four pi-conjugated nitrophenolates absorb within a relatively narrow region in solution, they cover the entire visible spectrum when isolated in vacuo [picture: see text]. The work combines gas- and solution-phase spectroscopy and provides the first benchmark of theoretical excitation energies for nitrophenolates.
authors.affiliation: Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C, Denmark.
authors.forename: Maj-Britt
authors.initials: MB
authors.lastname: Suhr Kirketerp
authors.forename: Michael
authors.initials: M
authors.lastname: Axman Petersen
authors.forename: Marius
authors.initials: M
authors.lastname: Wanko
authors.forename: Leonardo
authors.initials: L
authors.lastname: Andres Espinosa Leal
authors.forename: Henning
authors.initials: H
authors.lastname: Zettergren
authors.forename: Françisco M
authors.initials: FM
authors.lastname: Raymo
authors.forename: Angel
authors.initials: A
authors.lastname: Rubio
authors.forename: Mogens
authors.initials: M
authors.lastname: Brøndsted Nielsen
authors.forename: Steen
authors.initials: S
authors.lastname: Brøndsted Nielsen