A new Schiff-base ligand based on the condensation of diaminomaleonitrile and 4-(diethylamino)salicylaldehyde is reported with its copper, nickel, and zinc complexes. Their second-order nonlinear optical properties are investigated by electric field induced second harmonic (EFISH) and ZINDO quantum-chemical calculations to probe the role of the metal center in the nonlinearity. All the complexes exhibit a second-order nonlinear response that is larger than that of the ligand with an hyperpolarizability (beta) value of 400 (+/-100) 10(-30) cm(5) esu(-1) for the zinc derivative at 1.34 mu m. Theoretical calculations indicate that the two-level model is inadequate to describe the nonlinearity in such systems.
|Titolo:||Synthesis and second-order nonlinear optical properties of new copper(II), nickel(II), and zinc(II) Schiff-base complexes. Toward a role of inorganic chromophores for second harmonic generation|
|Data di pubblicazione:||1996|
|Appare nelle tipologie:||1.1 Articolo in rivista|