Abstract
Three nickel(II) complexes with phenanthroline-based ligands were synthesized and characterized by UV–visible, IR, MS, and elemental analysis. Their off-resonance third-order nonlinear optical (NLO)properties were measured using a femtosecond laser and the degenerate four-wave mixing technique. The third-order NLO susceptibilities χ (3) were 3.45–4.37 × 10−13 esu. The second-order hyperpolarizabilities γ of the molecules were 3.46–4.36 × 10−31 esu. The response times were 50–74 fs. The influence of the molecular structure on the third-order optical nonlinearity was analyzed. The results show that highly polarizable delocalized π-conjugated electron system is the key factor leading to strong third-order optical nonlinearity.
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