title: Three-photon absorption in anthracene-porphyrin-anthracene triads: a quantum-chemical study.
abstract: We have applied correlated quantum-chemical methods to investigate the three-photon absorption (3PA) response of a porphyrin triad derivative, where the central macrocycle is linked in mesopositions to two anthracene units via acetylenic bridges. The 3PA frequency-dependent spectrum of this derivative is dominated by a single resonance feature in the transparent region, associated with charge-transfer states between porphyrin and anthracene. The calculations indicate a two order of magnitude enhancement in the 3PA cross section in the triad molecule with respect to the individual entities, which is attributed to close one-, two-, and three-photon resonances together with strong electronic couplings among the units.
authors.affiliation: Laboratory of Organic Solids, Center for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, 100080 Beijing, People's Republic of China.
authors.forename: Lingyun
authors.initials: L
authors.lastname: Zhu
authors.forename: Xia
authors.initials: X
authors.lastname: Yang
authors.forename: Yuanping
authors.initials: Y
authors.lastname: Yi
authors.forename: Pengfei
authors.initials: P
authors.lastname: Xuan
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Shuai
authors.forename: Dezhan
authors.initials: D
authors.lastname: Chen
authors.forename: Egbert
authors.initials: E
authors.lastname: Zojer
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Brédas
authors.forename: David
authors.initials: D
authors.lastname: Beljonne