HBBP－对硝基苯腙的合成及其阴离子识别研究

本文设计合成了一种基于1-羟基-4-溴二苯甲酮对硝基苯腙（HBBP－对硝基苯腙）的比色阴离子受体1。此受体以羟基和腙单元为识别位点,以硝基苯基为信号报告基团。向受体1的DMSO溶液中加入AcO-、H2PO4-和F-的DMF后,溶液颜色由浅黄色变为棕红色,而加入所研究的其它阴离子则无变化或变化不大,从而实现受体对AcO-、H2PO4-和F- 这三种离子的裸眼识别。本文又利用紫外-可见吸收光谱、荧光光谱考察了其与AcO-、H2PO4-、F-、Cl-、Br-和I-阴离子的识别作用。     

一种双腙受体的合成及阴离子识别性能研究

设计合成了一种含双腙类阴离子受体1(5-甲基双水杨醛-2,4-二硝基苯腙)。用紫外-可见吸收光谱、荧光光谱考察了其与AcO-,H2PO4-,F-,Cl-,Br-和I-阴离子的作用。当加入AcO-、F-和H2PO4-时,受体分子1的吸收光谱发生明显的红移,与此同时溶液颜色由浅粉色变为紫色,而加入其他阴离子则无变化。通过在DMSO-d6核磁滴定实验进一步研究受体1和F-相互作用的本质。     

基于苯腙类衍生物的阴离子光学传感器的研究

本文设计合成了一种简单的比色阴离子受体1,5,5'-亚甲基双水杨醛-2,4-二硝基苯腙。利用UV-vis光谱和荧光光谱研究了受体1与阴离子AcO-,H2PO4-,F-,Cl-,Br-和I-的相互作用。当加入AcO-,F-和H2PO4-时,受体分子的吸收光谱发生明显的红移,与此同时溶液颜色由浅黄色变为红色,而加入其他阴离子则无变化。最后通过1HNMR滴定进一步研究了1与阴离子AcO-的相互作用的本质。     

酰腙类衍生物作为阴离子荧光探针的研究

本文设计合成了含偶氮酰腙类受体分子1,2-羟基-5-(4-硝基苯偶氮基)苯甲醛-p-硝基苯甲酰腙。用UV-Vis和荧光光谱考察了其与AcO-、H2PO4-、F-、Cl-、Br-和I-阴离子的作用。当加入AcO-、F-和H2PO4-时,受体分子的吸收光谱发生明显的红移,同时溶液颜色由无色变为紫红色。更为重要的是受体1对阴离子表现出荧光光谱的比率变化。最后通过在DMSO-d6中的核磁滴定实验研究受体1和F-相互作用的本质。     

2-羟基-1-萘甲醛缩N-氨基-N′-苯甲酰基硫脲的合成及其阴离子识别性能

2-羟基-1-萘甲醛与水合肼缩合制得2-羟基-1-萘甲醛腙(2);2与硫氰酸铵和苯甲酰氯反应合成了2-羟基-1-萘甲醛缩N-氨基-N′-苯甲酰基硫脲(1),其结构经1H NMR,IR和MS表征。通过UV检测研究了1(DMSO溶液)对8种阴离子的识别作用。当1的DMSO溶液中存在F-,AcO-或H2PO4-时,颜色均由无色变为黄色,同时UV谱图发生显著变化;而加入C l-,B r-,I-,NO3-或HSO4-时,颜色及其UV谱图均无明显变化。结果表明1在DMSO溶液中对F-,AcO-或H2PO4-具有识别作用。     

新型2-(2-氨基-4,5-二硝基苯基亚胺)甲基-6-羟甲基-4-甲基苯酚的合成及其对与阴离子的识别性能

以2,6-二羟基对甲基苯酚为起始原料,设计并合成了新型阴离子受体2-(2-氨基-4,5-二硝基苯基亚胺)甲基-6-羟甲基-4-甲基苯酚(1),其结构经1H NMR,IR和MS表征。通过UV测试了1对六种阴离子的识别作用。1在DMSO溶液中对F-,AcO-和H2PO4-具有比色识别作用,结合常数Ka大小顺序为F->AcO->H2PO4-,同时UV谱图发生显著变化。而1对Cl-,Br-,I-和HSO4-,颜色和UV-Vis谱图均无明显变化。结果表明,1在DMSO溶液中对F-,AcO-和H2PO4-有识别作用。     

Anion Recognition Using Novel and Colorimetric Tweezer Receptors:1,3-Phenylenedi(carbonylhydrazone) in Aqueous-organic Binary Solvents

本文设计合成了2种新型的间苯二甲酰腙类钳形受体。在DMSO和DMSO-H2O混合溶液中,通过紫外可见光谱分别考察了受体分子3a对F-, Cl-, Br-, I-, AcO-, HSO4-, H2PO4-和ClO4-的相互作用。结果表明,在DMSO溶液中,受体3a对F-,CH3COO-和H2PO4-有显著识别效果,溶液颜色由无色变为黄色,实现裸眼检测。在15%H2O-85%DMSO含水体系中,3a可高选择性识别CH3COO-。1H NMR滴定表明过量F-的加入使受体分子3a发生脱质子作用,探讨了主客体之间的作用机理。并直接用于水相中无机醋酸盐的直接显色检测。     

基于酰腙和酚羟基的阴离子受体的合成及其在含水介质中的阴离子比色识别性能

设计合成了一系列基于羟基和氨基的酰腙类受体分子.利用紫外-可见吸收光谱及1HNMR考察了其与F-,Cl-,Br-,I-,CH3COO-,H2PO4?,HSO4?,ClO?4等阴离子的作用.结果表明,该类受体分子在DMSO溶液中能较好地比色识别F-,CH3COO-,H2PO4?,其中受体2在含水介质中[V(DMSO)∶V(H2O)=7∶3]能选择性比色识别CH3COO-.1HNMR滴定实验研究了受体分子与阴离子之间的作用,结果表明受体分子与阴离子之间以氢键作用方式相结合.     

新型含酚羟基Schiff碱化合物的比色阴离子传感器

设计合成了一种含酚羟基Schiff碱类受体1-羟基-4-氯-二苯甲酮-2,4-硝基苯腙受体分子1.利用紫外-可见吸收光谱、荧光光谱考察了其与AcO -,H2PO4-,F-,Cl-,Br-,I-等阴离子的作用.当加入AcO -,F-和H2PO4-时,导致紫外光谱的可见光区明显变化(大约130nm红移),同时伴随着从亮黄色到粉红色的“裸眼”颜色变化.通过在DMSO-d6核磁滴定实验进一步研究了探针1和F-相互作用的本质.     

两种阴离子识别受体的合成及识别研究

两种同时包含酚羟基和二酰胺基团的的阴离子识别受体被设计和合成,通过紫外-可见光谱研究了受体分子和不同阴离子客体间的识别作用。研究结果发现,受体分子1在干燥的DMSO溶液中能选择性识别AcO-,其识别顺序为:AcO->F->H2PO4->Cl-,Br-,I-;受体分子2显示出对F-较强的识别作用,其识别顺序为:F->AcO->H2PO4-,Cl-,Br-,I-。同时通过紫外-可见光谱和核磁滴定实验,研究了只包含二酰胺基团的受体分子3对阴离子的识别作用,发现起识别作用的是二酰胺基团,但这种作用力非常小,不能有效地进行阴离子识别。进一步通过核磁共振滴定实验和理论研究,证实受体分子1和2在有效的阴离子识别过程中,酚羟基比酰胺基团起着更为重要的作用。     

Synthesis of Schiff Base Bearing Phenolic Hydroxy Group and Its Anion Recognition

A new anion receptor bearing phenolic hydroxy group based on 3,5-ditertbutylsalicylaldehyde-p-nitrophenylhydrazone (1) was designed and synthesized. Upon addition of AcO^- and F^-, the receptor exhibited visible color changes from deep yellow to purple. However, no obvious color changes were observed on addition of the other anions tested (H₂PO₄^-, Cl^-, Br^-, I^-). The binding properties of the receptor with anions such as AcO^- and F^- were investigated by UV-Vis and fluorescent titrations. The result indicated that the receptor 1 had a higher affinity to AcO^- and F^- and a 1:1 host-guest complex was formed through H-bond interactions between 1 and anions.     

A novel neutral receptor for selective recognition of H2PO 4 −

A new urea-based receptor was designed to selectively recognize H₂PO₄⁻ among other anions (such as F^-, Cl^-, Br^-, I^-, OH^-, AcO^-) in organic solvent (DMSO) through intermolecular hydrogen bonding. Addition of anions to the receptor caused changes in UV–vis spectrum which provided the first indication of its anion binding ability. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.     

基于含偶氮酚羟基席夫碱新型简单比色传感器

A novel N-(2-hydroxy-5-chlorodibenzophenone)-N0-[2-hydroxy-5-azophenyl-benzaldehyde]-1,2-diaminobenzene receptor has been synthesized by simple steps with good yields. The anion recognition properties were studied by ultraviolet-visible spectroscopy. The resultsshowed that the receptor had a higher affinity to F^-, AcO^-, and H₂PO₄^-, but no evident binding with Cl^-, Br^-, and I^-. Upon addition of the three former anions to the receptors in DMSO, the solution exhibited an obvious color change from colorless to yellow, which could be observed by the naked eye, thus the receptor could act as a fluoride ion sensor even in the presence of other halide ions. The UV-Vis data indicates that a 1:1 stoichiometric complex is formed through hydrogen bonding interactions between receptor and anions.     

A novel anion receptor employing the pyrrole and amide moieties in the cooperative binding of anions

A novel anion receptor 1 based on pyrrole and amide moieties was designed, synthesized and characterized by X-ray crystallography, ¹H NMR, ESI-MS and so on. Its anions (such as AcO^?, F^?, Cl^? and H₂PO₄ ^?) binding properties was studied in detail by the ¹H NMR titrations in DMSO-d ₆ .     

芳酰基硫脲受体的合成及对阴离子识别研究

设计合成了3种芳酰基硫脲受体分子. 利用紫外-可见吸收光谱考察了其与F^－, Cl^－, Br^－, AcO^－, HSO₄^－, H₂PO₄^－等阴离子的作用. 结果表明该类受体分子与阴离子形成氢键配合物. 加入F^－, AcO^－时, 溶液立刻由无色变为黄色, 而加入其它阴离子则无变化, 从而实现对这两种阴离子的裸眼识别. 结果表明受体分子与阴离子间形成1∶1型的配合物. ¹H NMR滴定及质子溶剂效应为受体分子与阴离子间的氢键作用本质提供了直接依据.     

Tunability of anion binding strength based on acyl-thiourea receptors containing isatin group

Some acyl-thiourea derivatives containing isatin group were synthesized and their interactions with anions were investigated using UV–vis spectroscopy and ¹H NMR titrations in DMSO and DMSO-d₆, respectively. These compounds have a same molecular framework, functionalising with different groups lead to different anion binding strength of these receptors. Receptor 1 showed a higher binding affinity for AcO⁻ than for F⁻, due to the cooperative multiple hydrogen bond interactions of AcO⁻ with the acyl-thiourea group and N–H group in the indole unit of receptor 1. Displacing the N–H proton in the indole unit with –CH₃ group, receptor 2 showed no obviously discriminative responses for F⁻, AcO⁻ and H₂PO₄⁻ due to lack of such additional binding. In the case of receptor 3, which was functionalised with strong electron-withdrawing group, it showed selectively chromogenic response for F⁻ based on double deprotonation of the receptor in DMSO, whereas AcO⁻ and H₂PO₄⁻ induced single deprotonation only.     

Simple indole-based colorimetric sensors with electron-withdrawing chromophores: Tuning selectivity in anion sensing

Three simple colorimetric anion sensors (1, 2, and 3) containing anthrone, 1,3-indanedione, and malononitrile as signaling chromophores and an indole binding site have been designed and synthesized. The introduction of electron-withdrawing groups can not only provide chromogenic signal output, but also tune the sensitivity and selectivity of indole-based anion sensors by electron push–pull features. Their anion binding and sensing properties were investigated in detail by dramatic color changes, UV–vis absorption, and ¹H NMR. As results revealed, sensor 1 showed high selectivity for F⁻ over AcO⁻ and H₂PO₄⁻ with a distinct change in color due to the deprotonation of indole NH group. The excellent selectivity of 1 for F⁻ can be attributed to the fitness in the acidity of its NH-group, which is tuned to be able to distinguish the subtle difference in the affinity of F⁻, AcO⁻, and H₂PO₄⁻ to NH proton.     

Novel N,N＇-Diacylhydrazine-Based Colorimetric Receptors for Selective Sensing of Fluoride and Acetate Anions

Three novel and simple N,N＇-diacylhydrazine-based colorimetric receptors have been prepared. The binding properties of the receptors to anions such as F^-, Cl^-, Br^-, AcO^-, HSO4^- and HEPO4^- in acetonitrile solution were examined by UV-Vis spectroscopy methods, which show high sensitivity and selectivity to F^- and AcO^- over other anions. The results indicated that a 1 ： 1 stoichiometry complex was formed between the receptors and the anions, while ^1H NMR titrations confirmed hydrogen binding interaction between the receptors and the anions.     

Selective “naked-eye” sensing of acetate ion based on conformational flexible amide-pyridinium receptor

A simple pincer-shape anion receptor L1 containing amide-pyridinium as binding unit was synthesized and its anion binding properties were investigated by UV–Vis, NMR titration spectra and molecular simulation. L1 displayed better affinity toward AcO^? ion with visible color change compared with other investigated anions, including F^?, H₂PO₄ ^?, Cl^?, Br^?, I^?, NO₃ ^? and HSO₄ ^? ions. The selectivity was ascribed to the synergistic effects arising from hydrogen bonding, electrostatic interaction and induced-fit process.