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首页> 外文期刊>Crystal growth & design >Molecular Packing Dependent Solid State Fluorescence Response of Supramolecular Metal-Organic Frameworks: Phenoxo-Bridged Trinuclear Zn(II) Centered Schiff Base Complexes with Halides and Pseudohalides
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Molecular Packing Dependent Solid State Fluorescence Response of Supramolecular Metal-Organic Frameworks: Phenoxo-Bridged Trinuclear Zn(II) Centered Schiff Base Complexes with Halides and Pseudohalides

机译：超分子金属 - 有机框架的分子包装依赖性固态荧光反应：苯氧基桥接三核Zn（II）以卤化物和伪卤化物为中心的席夫碱基配合物

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摘要

Molecular packing plays a key role in determining the photophysical properties in the aggregated state, but fine controlling of molecular packing is a great challenge. Here we report a series of new phenoxo-bridged homometallic trinuclear Zn (II) metal complexes (BN3, BNCS, BN(CN)2, BCl, BBr, and BI [complexes 1-6] having different anions with an aim to vary the photophysical properties of the complexes, where B stands for the ligand, N,N'-bis (3-ethoxysalicylidenimino)- 1,4-diaminobutane. All the complexes are structurally characterized by single crystal X-ray diffraction technique. The crystallographic investigation indicates that the complexes contain two types of Zn (II) centers: distorted square pyramidal and octahedral. The crystal structures are stabilized by intermolecular hydrogen bonding and C-H center dot center dot center dot pi interactions leading to distinct supramolecular frameworks. The ground state and excited state electronic properties of these metal complexes have been investigated. In solution state, all the metal complexes are found to be moderately fluorescent and emit at similar wavelengths with no significant effect of anions on fluorescence emission. However, interestingly, solid state emission properties have been found to be significantly dependent on molecular assembly. In this series, dicyanamide [2] and thiocyanate [3] complexes exhibit significantly red-shifted high fluorescence response in the solid state which is attributed to their distinct packing in comparison to others. To the best of our knowledge, these complexes are the first example of Schiff base complexes demonstrating intriguing molecular packing dependent fluorescence emission.
机译：分子包装在确定聚集状态中的光学性质方面发挥关键作用，但是对分子包装的微量控制是一个很大的挑战。在这里，我们报告了一系列新的苯氧基桥接型均质三核Zn（II）金属配合物（BN3，BNC，BN（CN）2，BCL，BBR和BI [配合物1-6]具有不同的阴离子，其目的是改变复合物的光物理性质，其中B代表配体，N，N'-BIS（3-乙氧基丙烯尼氨基​​） - 1,4-二氨基丁烷。所有复合物都是通过单晶X射线衍射技术的结构表征。晶体检查表明表明复合物含有两种类型的Zn（ii）中心：扭曲的方形锥形锥体和八面体。通过分子间氢键和CH中心点中心点中心点PI相互作用稳定，导致不同的超分子框架。地面态和兴奋状态已经研究了这些金属配合物的电子性质。在溶液状态下，发现所有金属配合物都是适度荧光的，并以类似的波长发射，没有显着影响阴离子s关于荧光发射。然而，有趣的是，已发现固态排放性能显着依赖于分子组装。在该系列中，二氰胺[2]和硫氰酸酯[3]复合物在与他人相比，其归因于它们不同的包装的固态显着红移的高荧光反应。据我们所知，这些复合物是Schiff碱基复合物的第一个例子，证明了有趣的分子包装依赖性荧光发射。

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  • 来源
    《Crystal growth & design》 |2018年第9期|共10页
  • 作者

    Dwivedi Nidhi; Sunkari Sailaja S.; Verma Abhineet; Saha Satyen;

  • 作者单位

    Banaras Hindu Univ Inst Sci Dept Chem Mahila Maha Vidyalaya Varanasi 221005 Uttar Pradesh India;

    Banaras Hindu Univ Inst Sci Dept Chem Mahila Maha Vidyalaya Varanasi 221005 Uttar Pradesh India;

    Banaras Hindu Univ Inst Sci Dept Chem Mahila Maha Vidyalaya Varanasi 221005 Uttar Pradesh India;

    Banaras Hindu Univ Inst Sci Dept Chem Varanasi 221005 Uttar Pradesh India;

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  • 正文语种 eng
  • 中图分类 晶体学;
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