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Three-photon absorption in anthracene-porphyrin-anthracene triads: a quantum-chemical study
Lingyun Zhu1, Xia Yang, Yuanping Yi
1Laboratory of Organic Solids, Center for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, 100080 Beijing, People's Republic of China.
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.
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