Two-photon absorption of Zn(II) octupolar molecules.

Authors :: Mazzucato S
Fortunati I
Scolaro S
Zerbetto M
Ferrante C
Signorini R
Pedron D
Bozio R
Locatelli D
Righetto S
Roberto D
Ugo R
Abbotto A
Archetti G
Beverina L
Ghezzi S
Source :: Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2007 Jun 21; Vol. 9 (23), pp. 2999-3005. Date of Electronic Publication: 2007 Apr 13.
Publication Year :: 2007
Abstract: In this work we present an investigation of the non-linear optical (NLO) properties of two octupolar chromophores: [Zn(4,4'-bis(dibutylaminostyryl)-[2,2']-bipyridine)(3)](2+) and [Zn(4,4'-bis((E)-2-(N-(TEG)pyrrol-2-yl)vinyl)-[2,2']-bipyridine)(3)](2+) with Zn(ii) as the coordination center, using two-photon emission technique (TPE) in fs-pulse temporal regime. Compared to the free ligands, our results do not show a net increase in the two-photon absorption (TPA) cross-section for the octupolar complexes, once normalized to the ligand unit. This is in partial disagreement with a previous theoretical study investigating the first molecule where a significant increase of the TPA cross-section was predicted (X. J. Liu, et al., J. Chem. Phys., 2004, 120, 11 493).