Synthesis, structures and optical properties of coordination compounds bearing N,N-dimethyl-4-(pyridin-4-yldiazenyl) aniline

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• 作者：Ling-Yun Xu^a ; Hong-Xia Chen^a ; Xue-Jian Sun^a ; Pei-Yang Gu^a ; Jian-Feng Ge^a ; ^b ; Na-Jun Li^a ; ^b ; Qing-Feng Xu^a ; ^b ; ^{xuqingfeng@suda.edu.cn} ; Jian-Mei Lu^a ; ^b ; ^{lujm@suda.edu.cn}
• 关键词：Coordination mode ; Dpya ; Crystal structure ; NLO property
• 刊名：Polyhedron
• 出版年：2012
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：16 March, 2012
• 卷：35
• 期：1
• 页码：7-14
• 文件大小：673 K

摘要

Seven coordination compounds, [Zn(Dpya)SO₄(H₂O)₃]_n (1, 1D chain), [Cu(Dpya)SO₄(H₂O)₃]_n (2, 1D chain), [MoOS₃(Dpya)₂Cu₃I]_n (3, 1D chain), [Cu(Dpya)I]_n (4, 1D chain), [Zn(Dpya)(NO₃)₂]_n (5, dimer), [Cu(Dpya)(Ac)₂]_n (6, dimer), [Zn(Dpya)₂Cl₂]_n (7, mononuclear) (Dpya = N,N-dimethyl-4-(pyridin-4-yldiazenyl) aniline) were synthesized and characterized by FTIR, elemental analysis and TG analysis. The structures of all these compounds were determined by single crystal X-ray diffraction, and structural analysis reveals that compounds 1-4 are 1D coordination polymers, compounds 5 and 6 are dimers with a similar structure and compound 7 is a mononuclear complex. The structural construction of these compounds is affected not only by the metal centers but also by the different counteranions. The photophysical properties of the ligand and the coordination compounds were also studied. For example, the third-order non-linear optical (NLO) properties of the ligand and its coordination compounds were measured by a 532 nm laser using the Z-scan technique. The ligand Dpya and three coordination compounds (1, 2 and 4) show non-linear reversible saturated absorption (RSA) behavior. More interestingly, the ligand Dpya shows visible green luminescence (位_ex 520 nm). The luminescent property was tuned by different metal ions and structures. It should be noted that compound 1 exhibits a strong orange-light emission assigned to a ligand-metal charge transfer (LMCT).