Author/Authors :
Collini، نويسنده , , Elisabetta and Mazzucato، نويسنده , , Simone and Zerbetto، نويسنده , , Michele and Ferrante، نويسنده , , Camilla and Bozio، نويسنده , , Renato and Pizzotti، نويسنده , , Maddalena and Tessore، نويسنده , , Francesca and Ugo، نويسنده , , Renato، نويسنده ,
Abstract :
A large two photon absorption (TPA) cross section of about 4000 GM is measured by Z-scan technique for a push–pull A–π–D Zn(II) porphyrin complex disubstituted in the meso position with strong donor and acceptor moieties. This result is compared to the lower TPA cross section of Zn(II) porphyrinates mono-substituted in the meso or β pyrrolic position with the same donor or acceptor substituents. The origin of such trend is discussed in terms of charge transfer processes, π delocalisation and resonance pathways.
