Third-order NLO properties of the DMF solutions of 3-D network and 2-D layered organic–metal polymers with (4, 4) grid units
Third-order NLO properties of the DMF solutions of 3-D network and 2-D layered organic–metal polymers with (4, 4) grid units
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DOI：
10.1016/j.ica.2004.12.021
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发表时间：
2005-03
影响因子：
2.8
通讯作者：
Q. Chang;Xiang-Ru Meng;Yinglin Song;H. Hou
中科院分区：
文献类型：
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作者：
Q. Chang;Xiang-Ru Meng;Yinglin Song;H. Hou
1,1′-(1,4-丁二基)双-1H-苯并咪唑 (bbbm) 与 Cd(II)、Ni(II) 或 Co(II) 反应得到三种有机金属聚合物：{[Cd(bbbm)(SO4)(H2O)2]CH3OH}n(1)， {[Ni(bbbm)2(H2O)2](NO3)2·2CH3OH·6H2O}n(2)和{[Co(bbbm)2(H2O)2](NO3)2·2CH3OH·6H2O}n(3)。在图 1 中，bbbm 和 SO42- 同时与 Cd(II) 配位，形成 3-D 结构。在 2 和 3 中，每个桥联 bbbm 配体连接两个 Ni(II) 或 Co(II) 离子，形成具有 (4, 4) 网格单元的二维层状结构。每个(4, 4)网格单元是一个44元环，由四个bbbm配体作为四个边和四个Ni(II)或Co(II)离子代表四个角构成。通过Z扫描技术研究了它们在DMF溶液中的三阶非线性光学（NLO）特性。结果表明，2的DMF溶液同时具有大的三阶非线性光学吸收和强的折射行为；和3显示出较大的NLO吸收效应和较弱的NLO折射行为。实验数据与理论曲线之间相当良好的拟合表明，实验获得的 NLO 效应本质上是有效的三阶效应。
Reactions of 1,1′-(1,4-butanediyl)bis-1H-benzimidazole (bbbm) with Cd(II), Ni(II), or Co(II) afford three organic–metal polymers: {[Cd(bbbm)(SO4)(H2O)2]CH3OH}n(1), {[Ni(bbbm)2(H2O)2](NO3)2·2CH3OH·6H2O}n(2) and {[Co(bbbm)2(H2O)2](NO3)2·2CH3OH·6H2O}n(3). In 1, bbbm and SO42- coordinate to Cd(II) simultaneously leading to a 3-D structure. In 2 and 3, each bridging bbbm ligand links two Ni(II) or Co(II) ions forming the 2-D layered structure with (4, 4) grid units. Each (4, 4) grid unit is a 44-membered ring and constructed by four bbbm ligands acting as four sides and four Ni(II) or Co(II) ions representing four corners. Their third-order nonlinear optical (NLO) properties in DMF solution have been studied by Z-scan technique. The results show that the DMF solution of 2 possesses both the large third-order NLO absorptive and strong refractive behaviors; and 3’s shows large NLO absorptive effect and weak NLO refractive behavior. A reasonably good fit between the experimental data and the theoretical curve suggests that the experimentally obtained NLO effects are effective third-order in nature.