Abstract
The two-photon absorption (TPA) properties of 4,4′-bis( para-di- n-butylaminostyryl)-2,2′-bipyridine (NBu 2bipy) and related dipolar ([ZnY 2(NBu 2bipy)] (Y = Cl, CF 3CO 2), [Zn(2,2′-bipyridine) 2(NBu 2bipy)][PF 6] 2) and octupolar ([Zn(NBu 2bipy) 3][PF 6] 2) complexes were investigated by the two-photon emission (TPE) technique in a femtosecond regime, working in the 730–930 nm spectral range. We found, in contrast with previous literature data, that the TPA enhancement upon coordination of a TPA active ligand to a metal center may be larger in the dipolar rather than the corresponding octupolar complex, the response being easily modulated by the choice of the ancillary ligands.
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