Abstract: Pentaazadentate metal complexes are a macrocyclic ligand containing 22 $pi@-electrons, which coordinate with numerous metal ions to form near coplanar configurations with excellent thermal and light stabilities. A more extended optical window between Soret (420 nm) and Q (760 nm) band in visible region provides a condition for requiring high transmittances at low incident light intensity and they are of also large third- order nonlinear optical susceptibilities comparing with porphyrin's and phthalocyanine's metal complexes. The third- order optical susceptibilities $chi$+(3)$/$-1111$/ are determined at 647 nm in methanol by pump-probed procedure and the molecular second hyperpolarizabilities $gamma$-1111$/ which are of approximately 10$+$MIN@31$/ esu are also obtained. Optical limiting based on reverse saturable absorption are observed for ns pulses laser. The optical limiting behaviors may be alternated by introduce different substituents onto the benzene ring or/and different metal ion into the center of macrocylic ligands The limiting threshold at T/T$-0$/ equals 0.5 is 131 mJ/cm$+2$/ for complex $LB@(PL- NO$-2$/)Cd$RB@Cl, the corresponding clamped energy is 34 mJ/cm$+2$/. The optical limiting performance may be influenced by solution concentrations. !7
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机译：摘要：五氮杂齿金属配合物是一种大环配体，含有22个π电子，能与多种金属离子配合形成近共面构型，并具有出色的热稳定性和光稳定性。可见光区Soret（420 nm）和Q（760 nm）波段之间更大的光学窗口为在低入射光强度下要求高透射率提供了条件，并且与卟啉和酞菁相比，它们具有较大的三阶非线性光学敏感性。金属配合物。通过泵探测方法在甲醇中的647 nm下测定三阶光学磁化率$ chi $ +（3）$ / $-1111 $ /，并且分子第二超极化率$γ$ -1111 $ /约为10 $还可以获得+ $ MIN @ 31 $ / esu。对于ns脉冲激光器，观察到基于反向饱和吸收的光学极限。可以通过在苯环上引入不同的取代基或/和在大环配体的中心引入不同的金属离子来改变光学限制行为。T/ T $ -0 $ /等于0.5的限制阈值为131 mJ / cm $ + 2 $ /对于复杂的$ LB @（PL- NO $ -2 $ /）Cd $ RB @ Cl，相应的钳位能量为34 mJ / cm $ + 2 $ /。光学极限性能可能受溶液浓度影响。 ！7
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