Large two photon absorption cross section of asymmetric Zn(II) porphyrin complexes substituted in the meso or β pyrrolic position by –CC6H4X moieties (X=NMe2, NO2)
- Resource Type
- Article
- Authors
- Collini, Elisabetta; Mazzucato, Simone; Zerbetto, Michele; Ferrante, Camilla; Bozio, Renato; Pizzotti, Maddalena; Tessore, Francesca; Ugo, Renato
- Source
- Chemical Physics Letters. Mar2008, Vol. 454 Issue 1-3, p70-74. 5p.
- Subject
- *PHOTONS
*ABSORPTION
*ZINC
*PORPHYRINS
- Language
- ISSN
- 0009-2614
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. [Copyright &y& Elsevier]