title: Amplified two-photon absorption in trans-A2B2-porphyrins bearing nitrophenylethynyl substituents.
abstract: We show that peripheral nitro groups enhance the maximum two-photon absorption cross-section of trans-A(2)B(2)-porphyrins bearing two phenylethynyl substituents by more than one order of magnitude. Maximum values as high as 1000 GM result from realization of suitable conditions for effective resonance enhancement along with a lowering of the energy and intensification of the two-photon allowed transitions in the Soret region.
authors.affiliation: Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw, Poland.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Nowak-Król
authors.forename: Craig J
authors.initials: CJ
authors.lastname: Wilson
authors.forename: Mikhail
authors.initials: M
authors.lastname: Drobizhev
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Kondratuk
authors.forename: Aleksander
authors.initials: A
authors.lastname: Rebane
authors.forename: Harry L
authors.initials: HL
authors.lastname: Anderson
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Gryko