• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>ACS Omega >Functional Molecular System of Bis(pyrazolyl)pyridineDerivatives: Photophysics Spectroscopy Computation and Ion Sensing
【2h】

Functional Molecular System of Bis(pyrazolyl)pyridineDerivatives: Photophysics Spectroscopy Computation and Ion Sensing

机译：双（吡唑基）吡啶的功能分子系统导数：光物理光谱学计算和离子感测

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A new series of conjugated donor−π–acceptor type of 2,6-bis(pyrazolyl)pyridine derivatives (compounds >IK-(3–9)) have been synthesized via Horner–Wadsworth–Emmons (HWE) reaction, starting from a common phosphonate precursor and diverse donor aromatic aldehydes and characterized by routine spectral analysis including elemental analysis. Compound >IK-2, one of the starting precursors, and molecule >IK-3, the first member of the donor−π–acceptor series, are additionally characterized by single-crystal X-ray structure determination. Compounds >IK-2 and >IK-3 are crystallized in P1̅ (triclinic) and P21/c (monoclinic) space groups, respectively. The absorption maxima in the electronic spectra of the title compounds shift mainly due to intramolecular charge transfer (ICT) between different donor (dibutyl and cyclic pyrrolidine) groups and the acceptor moiety [2,6-bis(pyrazolyl) pyridine]. Solution-state emission spectral studies of all these compounds show large solvent sensitive behavior with significant amounts of Stokes shifts. The large solvent dependence of the emission indicates that the excited state is stabilized in more polar solvents due to the ICT. All chromophores exhibit solid-state fluorescence behaviorexcept compound >IK-7. The role of the position and natureof the donor functionalities in the conjugated backbone of overalldonor moiety of compounds >IK-(3–9), on the electronicabsorption properties of the title chromophores has been demonstrated,which has further been corroborated by density functional theory (DFT)and time-dependent DFT (TDDFT) computational studies. The emissionspectral results of compounds >IK-3, >IK-5, and >IK-7 have also been supported by the DFT and TDDFTcalculations. A fluorescence lifetime study on this series also showsthat the excited states are stabilized in more polar solvents. Finally,one of the chromophores (chromophore >IK-4) in the titleseries has been shown to act as a selective molecular sensor (turn-offswitch) for the Cu(II) ion.
机译：通过Horner-Wadsworth-Emmons（HWE）合成了一系列新的共轭供体-π-受体类型的2,6-双（吡唑基）吡啶衍生物（化合物> IK-（3–9）） ）反应，从常见的膦酸酯前体和各种供体芳族醛开始，并通过常规光谱分析（包括元素分析）进行表征。化合物> IK-2 （起始前体之一）和分子> IK-3 （供体-π–受体系列的第一个成员）还具有单晶特征X射线结构测定。化合物> IK-2 和> IK-3 在P 1 ̅< / mo> （三斜）和P21 / c（单斜）空间组。标题化合物在电子光谱中的吸收最大值发生偏移，主要是由于不同供体（二丁基和环状吡咯烷）与受体部分[2,6-双（吡唑基）吡啶]之间的分子内电荷转移（ICT）。所有这些化合物的溶液状态发射光谱研究表明，在较大的斯托克斯频移下，溶剂的敏感行为较大。发射对溶剂的依赖性很大，这表明由于ICT，激发态在极性更大的溶剂中稳定了。所有生色团均表现出固态荧光行为除了复合> IK-7 。职位和性质的作用整体共轭骨架的供体功能电子上化合物> IK-（3–9）的供体部分已经证明了标题生色团的吸收特性，密度泛函理论（DFT）进一步证实了这一点以及与时间有关的DFT（TDDFT）计算研究。发射DFT和TDDFT还支持化合物> IK-3 ，> IK-5 和> IK-7 的光谱结果计算。该系列的荧光寿命研究还显示激发态在更多极性溶剂中稳定。最后，标题中的一个生色团（生色团> IK-4 ）已证明该系列可用作选择性分子传感器（关闭Cu（II）离子）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号