Substituted group-directed assembly of Zn(II) coordination complexes based on two new structural related pyrazolone based Salen ligands: Syntheses, structures and fluorescence properties

Substituted group-directed assembly of Zn(II) coordination complexes based on two new structural related pyrazolone based Salen ligands: Syntheses, structures and fluorescence properties
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基于两种新结构相关吡唑啉酮 Salen 配体的 Zn(II) 配位配合物的取代基定向组装:合成、结构和荧光性质

DOI:
10.1016/j.ica.2014.12.008
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发表时间:
2015-03
影响因子:
2.8
通讯作者:
Wen-Yan Xu
Wen-Yan Xu
中科院分区:
化学3区
文献类型:
--
作者:
Guo-Quang Cheng;Xiao-Run Wang;Pan-Pan Liu;Wen-Yan Xu

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设计并合成了两个新的吡唑啉酮类Salen配体:N,N′-乙胺双[1-(4-甲氧基苯基)-3-甲基-4-苯甲酰基亚氨基-2-吡唑啉-5-醇](H2 LI)和N,N′-乙胺双[1-(4-甲氧基苯基)-3-甲基-4-乙酰基亚氨基-2-吡唑啉-5-醇](H2 LII). Zn(OAc)2与两个配体反应,生成了两个新的Zn(II)配合物[ZnLI(CH 3OH)](1)和[Zn 2LII 2](2),通过单晶X射线衍射、粉末X射线衍射、元素分析、红外光谱和热重分析对其进行了表征。五配位Zn(II)离子在N2 O3区的单核配合物1在单斜空间群P21/c中结晶,而五配位Zn(II)离子在N2 O2区的羟基桥联双核[Zn 2LII 2]配合物(2)在单斜空间群C2/c中结晶,并具有Zn-O-Zn-O四元环。结构测定表明,该类Salen配体4,4 ′-位上的取代基是影响晶体排列的重要因素。研究了这两种化合物在室温下固态和溶液中的荧光性质。结果提供了有趣的见解配体的影响,锌(II)配合物的结构和荧光性质。
Two new structure-related pyrazolone-type Salen ligands, N,N′-ethylamine bis[1-(4-methoxy-phenyl)-3-methyl-4-benzoylimino-2-pyrazoline-5-ol](H2LI) and N,N′-ethylamine bis[1-(4-methoxy-phenyl)-3-methyl-4-acetylimino-2-pyrazoline-5-ol](H2LII) have been designed and synthesized with the ultimate aim of self-assembling novel Zn(II) compounds with interesting fluorescence properties. Reactions of Zn(OAc)2with the two ligands led to the formation of two new Zn(II) complexes with the formulae of [ZnLI(CH3OH)] (1) and [Zn2LII2] (2), which have been characterized by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, IR spectroscopy and thermal gravimetric analysis. Mononuclear complex1with the pentacoordinated zinc(II) ion hosted into the N2O3 compartment crystallized in the monoclinic space groupP21/c, while the hydroxyl-bridged dinuclear [Zn2LII2] complex (2) with the pentacoordinated zinc(II) ion hosted into the N2O2 compartment crystallized in the monoclinic space groupC2/cand had a Zn–O–Zn–O four-membered ring. The structure determinations show that substituted group at the 4,4′-position of the this kind of Salen ligands are important factors influencing the crystalline array. The fluorescent properties of the two compounds at ambient temperature both in solid state and solution were also investigated. The results provided interesting insights into ligand effects on the structures and fluorescent properties of zinc(II) coordination complexes.
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