Two new nickel (Ⅱ) complexes were synthesized and characterized by UV, IR, MS and elemental analysis. By using femtosecond laser, the off-resonant third-order optical nonlinearities of the complexes were measured with degenerate four-wave mixing technique. The third-order nonlinear optical susceptibilities X(3) are 3.21xl0-13 esu and 3.58xl0-13 esu. The nonlinear refractive indexes in are 5.89xl0-12 esu and 6.58xl(T12 esu. The second-order hyperpolarizabilities y of the molecules are 3.21xl0-31 esu and 3.57xl0-31esu. The response times t are 54 fs and 59 fs. The influence of the molecular structure on the third-order optical nonlinearity was studied. The results show that large and highly delocalized ir-conjugated electron system is the key factor leading to the strong third-order optical nonlinearity.%合成了两种新的Ni(Ⅱ)配合物,用UV、IR、MS和元素分析进行了表征.采用飞秒激光,运用简并四波混频法,研究了Ni(Ⅱ)配合物在非共振状态下的三阶非线性光学性能.它们的三阶非线性光学极化率x(3)为3.21×10-13 esu和3.58× 10-13 esu,非线性折射率n2为5.89× 10-12 esu和6.58×10-12 esu,分子二阶超极化率γ为3.21×10-31 esu和3.57×10-31 esu,响应时间τ为54 fs和59 fs.探索了配合物的分子结构对三阶非线性光学性能的影响.结果表明具有大的高度离域的π电子共轭体系是获得较大三阶非线性光学性能的关键.
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