| Abstract
| - The synthesis and structural, photophysical, and second-order nonlinear optical (NLO) propertiesof a novel lanthanide terpyridyl-like complex family LLn(NO3)3 (Ln = La, Gd, Dy, Yb, and Y) are reported.The isostructural character of this series in solution and in the solid state has been established on thebasis of X-ray diffraction analysis in the cases of yttrium and gadolinium complexes, theoretical optimizationof geometry (DFT), and NMR spectroscopy. The absorption, emission, and solvatochromic properties ofthe free terpyridyl-like ligand L were thourougly investigated, and the twist intramolecular charge transfer(TICT) character of the lowest energy transition was confirmed by theoretical calculation (TDDFT and CIS).The similar ionochromic effect of the different lanthanide ions was evidenced by the similar UV−visiblespectra of the complete family of complexes. On the other hand, the quadratic hyperpolarizability coefficientβ, measured by the harmonic light scattering (HLS) technique, is clearly dependent on the nature of themetal, and a careful examination of the particular case of yttrium unambiguously confirms the contributionof metal f electrons to the NLO activity.
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