搜索到503篇“ NAPHTHALIMIDE“的相关文章
White light generation by regulating hydrogen bond-sensitive ESPT of naphthalimide dyes
2024年
White light emitting systems of pure organic materials have attracted extensive research interest due to their better compatibility and functional scalability.The reported organic white light materials are mainly based on the multi-channel emission regulation of the compound itself or the mixing of multicolor luminescence materials,but studies on the dependence between multicolor luminescence and the external environment are lacking,which limits the application of these materials in areas such as identification and sensing.This paper reports that the 4-or 3?hydroxyl-substituted naphthalimides NapH1 and NapH2 form intermolecular hydrogen bonds with adjacent molecules in the environment,and undergo excited-state intermolecular proton transfer under irradiation,resulting in blue-yellow or blue-red dual fluorescence emission,respectively.Since the two compounds have different two-color luminescence channels and the two-color intensity ratio is affected by the environment,and the intermolecular hydrogen bond is determined by the hydrogen bond receptor,polarity,and temperature in the environment,the full spectrum from blue to red light and white light emission can be obtained by adjusting the mixing ratio of the two dyes and the solvent polarity and the ambient temperature.This environmentally sensitive white emission is used to detect the alkalinity of different papers,and the dyed paper can be used as a test strip for acid-base vapor detection.
Jin LiQinglong QiaoNing XuWei ZhouJingli YuanZhaochao Xu
关键词:NAPHTHALIMIDE
The remarkable effect of amino hydrogen on membrane permeability and organelle staining of 1,8-naphthalimide dyes
2024年
Membrane permeability and intracellular diffusion of fluorescent probes determine staining selectivity of intracellular substructures.However,the relationship between the molecular structure of fluorescent probes and their membrane permeability and intracellular distribution is poorly understood.In this paper,we reported a series of 1,8-naphthalimide dyes and carried out cell imaging experiments,and found that the presence of amino hydrogen in these dyes played a crucial role in their cell membrane permeability and intracellular distribution.The secondary amino group containing compounds 1-4 show excellent membrane permeability and strong fluorescence in living cells.While the tertiary amine containing dyes 5 and 6 can hardly permeate the cell membrane though they show extremely similar structure with compounds 2-4.Compound 1 can selectively image lipid droplets by selecting the wavelength of excitation light.With the specificity for lysosomes,2 and 4 have been used in long-term time-lapses imaging of lysosomal dynamics and tracking the process of lysosome-lysosome interaction,fusion and movement.The effect of hydrogen-containing amino substituent on the cell membrane permeability of fluorescent molecules is promising for the development of better biocompatible probes.
Zhifeng LiQinglong QiaoNing XuKai AnWenchao JiangYi TaoPengjun BaoYinchan ZhangZhaochao Xu
关键词:1,8-NAPHTHALIMIDELYSOSOME
一种基于萘酰亚胺并噁嗪的CN-探针
2024年
虽然氰离子的检测分析方法有多种,但仍存在着一些不足的地方,如响应时间较长、灵敏度不高,离子选择性也有待改善,或者在检测前须采取其他方法先处理干扰离子等。合成了一类含有萘酰亚胺基团的噁嗪光致变色化合物,表现出良好的光致变色性能,同时也对氰离子具有很好的识别性能、高选择性、良好的抗干扰能力、很低的检测极限和快速的响应时间,对于氰离子的在线检测也有着潜在的应用价值。
柳锦琦夏仁汝袁丽媛陆靖一陈骑敏任家强王薇
关键词:氰离子萘酰亚胺
Molecular Engineering of Naphthalimide Methylcyclohexane Luminogen:Unraveling J^(*)-Aggregation Pattern and Sensing Melamine in Aqueous Media
2024年
Naphthalimide methylcyclohexane(NMICY)luminogen that features molecular conformation-directed aggregation-induced emission was prepared,and its pure equatorial conformer was isolated and wellcharacterized via various techniques,including single-crystal X-ray diffraction(SC-XRD)analysis.In NMICY,the methyl cyclohexane substituent adapted the most stable chair conformation,preventing intermolecularπ-πinteractions among the naphthalimide cores.Careful analysis of the self-assembly behavior indicated that an uncommon J^(*)-aggregation pattern was predominant for NMICY that exhibited∼450 nm emission in crystal as well as in the aggregated state[λmax=455 nm,фPL=23.22%,fw=99.9%in water or water-dimethylformamide mixture].NMICY self-assembled into cube-shaped 2D-nanoarchitecture as characterized by fieldemission scanning electron microscopy,atomic force microscopy,and dynamic light scattering(Zavg=143 nm,∼20 nm height)studies while also displaying unique optical properties in the aggregated state.The supramolecular self-assembly and aggregated state structure-property relationship in aqueous media of NMICY were optimized,and a facile strategy for the detection of melamine in milk and an aqueous solution of milk powder is reported with a limit of detection value of 0.184 ppm(milk)and 0.101 ppm(milk powder),achieved via the rare acceptor-excited photoinduced electron transfer mechanism.Furthermore,a smartphone-based,portable,and uncomplicated sensing platform was developed that simplifies the melamine detection process.
Kavita NarangParameswar Krishnan Iyer
4-取代1,8-萘酰亚胺类荧光探针的研究进展
2024年
荧光光谱法是一种针对定量低浓度分析物检测的技术手段。近年来的研究进展表明,1,8-萘酰亚胺、罗丹明B、香豆素、喹啉等荧光团具有潜在的研究和应用价值。其中对1,8-萘酰亚胺衍生物的研究不断增加,因为它们具有强吸收和发射波长、高光稳定性、大的Stokes位移、较高的荧光量子产率以及4位结构易于修饰等优点。近年来,新型4-取代1,8-萘酰亚胺类荧光探针的设计和制备受到了广泛的关注。综述了4-取代1,8-萘酰亚胺类荧光探针的研究进展,通过在1,8-萘酰亚胺单元的C-4位置引入不同的给电子或接受电子基团,可以实现改变1,8-萘酰亚胺类荧光探针的荧光性能。
李辉李兆云
关键词:荧光探针
基于萘二酰亚胺衍生物的离子识别聚集诱导发光(AIE)材料的设计合成及其性能研究
2024年
萘二酰亚胺(NDI)虽然具有诸多优良特性,但是萘二酰亚胺类衍生物的诸多缺点却限制了其应用。因此,改进萘二酰亚胺类衍生物的缺点有着非常重要的意义,将能够促进其得到有效应用。以二(2-乙基己基)-4,9-二溴-萘四羧酸二酰亚胺分子作为核心骨架,通过合理的结构修饰,进一步加大以NDI芳香核为基本单元的共轭结构,系统研究他们的分子结构、固态及离子识别性能。
袁筱琬
关键词:离子识别
N-取代萘二酰亚胺乙酸类衍生物的合成及生物活性
2024年
采用活性基团拼接法,以1,8-萘二甲酸酐为基本骨架,合成了3个具有植株生长调节功能的新型萘二酰亚胺乙酸类衍生物,并经1H NMR、元素分析确定了化合物的结构。室内生物活性测试结果显示:目标化合物4a在质量浓度为1 mg/L时,对绿豆种子的发芽促进率达到254.55%,芽长促进率达到136.36%,根长促进率达到75.00%;在4℃、质量浓度为0.67 mg/L时,对小麦种子的发芽促进率达到240%。目标化合物4a表现出优异的抗低温胁迫和植物生长调节活性。
田朝瑜李振杰孔衍傅吉尧孙鉴昕田庆功
关键词:新化合物植物生长调节活性
基于1,8-萘酰亚胺的Ag^(+)荧光探针的合成及应用
2023年
通过N-丁基-4,5-二氨基-1,8-萘酰亚胺与2-噻吩甲醛缩合,构建了一种基于分子内电荷转移(ICT)的荧光探针NAPH-1(6-氨基-2-丁基-7-((噻吩-2-基亚甲基)氨基)-1H-苯并[de]异喹啉-1,3(2H-二酮)),其结构经^(1)H NMR、^(13)C NMR、HRMS和元素分析确证。探究了该探针对Ag^(+)选择性、荧光滴定、淬灭常数、检测限等性能。研究结果表明,NAPH-1对Ag^(+)呈现出荧光淬灭效应,猝灭常数为2.96×10^(5)L·mol^(-1)。值得关注的是,NAPH-1表现出对Ag^(+)较好的选择性和响应性,检测限为0.32μmol·L^(-1)。水样中测定结果表明,NAPH-1可以作为一种潜在的Ag^(+)检测工具。
周五潘远江曹语吴爱斌舒文明余维初
关键词:荧光探针萘酰亚胺
萘酰亚胺类荧光探针金属离子荧光体系的构建被引量:1
2023年
随着工业废水排放问题社会关注度的提升,近几年检测金属离子的研究也愈发受到关注。人体正常生命活动需要多种金属元素的协同,但过量的金属元素将会对人的健康造成巨大的威胁。铁是人体必须的金属元素,与多种生理活动有密不可分的关系,如免疫及各种催化反应,但过量的铁摄入会导致铁中毒。铝被应用于污水处理、食物加工等方面,但过量的铝会使人发生一系列的代谢紊乱,加速衰老,并对脑细胞造成损伤。因此为确保人民的人身安全和身体健康,设计制备一种反应灵敏,高响应,使用方便,反应时间短的用于金属离子检测的探针是十分必要的。
周小暄吕坤妍孙静文张杨李安琪吕玉光
关键词:萘酰亚胺荧光探针金属离子
基于1,8-萘酰二胺的具有近红外吸收的π-共轭有机太阳能电池给体材料的分子设计
2023年
为了提高有机太阳能电池(Organic solar cells, OSCs)给体材料的光吸收效率,本文设计了系列以噻吩异靛蓝分子片段为中心,不同芳香杂环为π-桥,1,8-萘酰二胺(1,8-Naphthalimide, NI)分子片段为端基的新型π-共轭化合物作为有机太阳能电池给体材料.利用量子化学中的密度泛函理论和含时密度泛函理论方法,对所设计的化合物的光学和电子性质进行了研究,探究分子结构与光谱和电子性质之间的联系.计算结果表明,通过在母体化合物中引入不同的π-桥,可以有效调节所设计分子的前线分子轨道能级、能隙和光谱性质.但是,其对设计分子的几何结构影响不大.设计的化合物分子均具有窄的能隙,在可见光和近红外光谱(NIR)区都有强吸收,这有利于提高有机太阳能电池光吸收效率.前线分子轨道能级分析发现,部分设计的化合物能级与典型富勒烯受体材料相匹配,可选用传统PCBM,bisPCBM和PC_(71)BM作为受体材料,另一部分设计化合物,则应考虑选用其他的太阳能电池受体材料.研究结果表明,本文所设计的化合物可作为具有红光或NIR区有强吸收的高效太阳能电池给体材料应用于太阳能电池中.本研究为开发和合成新型高效有机太阳能给体材料提供理论依据.
崔克宇孙涛石静敏王良
关键词:前线分子轨道有机太阳能电池吸收光谱

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蒋伟
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