Abstract
The linear (absorption and emission) and nonlinear optical (NLO) properties of a series of D3 [(Fe(II), Ru(II), Ni(II), Cu(II), Zn(II)] octupolar metal complexes featuring the 4,4'-bis[(dibutylamino)styryl]-2,2'- bipyridine ligand are reported. Zinc(II), nickel(II), and copper(II) complexes exhibit similar absorption spectra in the visible region (λ ILCT = 474-476 nm) which are assigned to intraligand charge-transfer (ILCT) bands. The quadratic and cubic NLO properties are strongly influenced by the nature of the metallic center. Harmonic light scattering studies at λ = 1.91 μm reveal that these chromophores display large first hyperpolarizabilities β1.91 in the range of (211-340) × 10-30 esu; replacing the Zn(II) metal ion by Ni(II) or Cu(II) results in a decrease of the static β0 coefficient by a factor of 1.5-1.6. Z-scan measurements at 765 and 965 nm reveal relatively large two-photon absorption cross-sections [650 < σ2 < 2200 GM], showing that both β and σ2 values can be tuned by simple modification of the metal ion.
Original language | English |
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Pages (from-to) | 8980-8985 |
Number of pages | 6 |
Journal | Journal of Physical Chemistry A |
Volume | 111 |
Issue number | 37 |
DOIs | |
Publication status | Published - 20 Sept 2007 |