Enlarged pi-electronic network of a meso-meso, beta-beta, beta-beta triply linked dibenzoporphyrin dimer that exhibits a large two-photon absorption cross section.

Enlargement of the pi-electronic network of meso-meso, beta-beta, beta-beta triply linked diporphyrin has been exploited by preparing a corresponding dibenzo-fused porphyrin dimer that exhibits a perturbed absorption spectrum and a large two-photon absorption cross section.