Three-photon absorption in anthracene-porphyrin-anthracene triads: a quantum-chemical study.
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.
Zhu
Lingyun
L
Laboratory of Organic Solids, Center for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, 100080 Beijing, People's Republic of China.
Yang
Xia
X
Yi
Yuanping
Y
Xuan
Pengfei
P
Shuai
Zhigang
Z
Chen
Dezhan
D
Zojer
Egbert
E
Brédas
Jean-Luc
JL
Beljonne
David
D