A naked-eye, selective and sensitive chemosensor for fluoride ion

2010 ◽  
Vol 64 (6) ◽  
Author(s):  
Puhui Xie ◽  
Fengqi Guo ◽  
Weifeng Wang ◽  
Xiyang Liu
Keyword(s):  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Fluorescence Spectra ◽  
Color Change ◽  
Fluoride Ion ◽  
Absorption And Fluorescence Spectra ◽  
Strong Fluorescence ◽  
Naked Eye ◽  
Acridine Yellow ◽  
Intermolecular Charge Transfer

AbstractEffect of the addition of six different anions on the absorption and fluorescence spectra of acridine yellow G (AYG) was examined. Only the F− anion could induce a visible color change observable with naked eye and a strong fluorescence quenching with K SV of 8.3 × 104 mol−1 L in CH3CN solutions. Calculated results of the interaction between the F− anion and acridine yellow G using the B3LYP/6-31G(d) program showed that the intermolecular charge transfer through the formation of an H-bond between AYG and F− is an essential sensor mechanism.

Synthesis, Characterization and Photophysical Properties of Rhenium(I) Complexes Containing 4,5-Diazafluorene Ligan

2011 ◽  
Vol 239-242 ◽  
pp. 2612-2615
Author(s):  
Jie Xiu Wang ◽  
Feng Zhao
Keyword(s):  
Charge Transfer ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Absorption And Fluorescence Spectra ◽  
Rhenium Complexes ◽  
H Nmr ◽  
Ligand Charge Transfer

Two related tricarbonyl rhenium complexes with the formula of [Re(CO)3(L)Cl], where L=4,5-diazafluoren-9-one (Dafo-Re) and 9-(phenylamino)-4,5-diazafluoren (PADF-Re) were successfully synthesized with the aim to explore the effect of the geometry of Dafo on Rhenium(I) coordination, and characterized by1H NMR. Photophysical behaviors are investigated by UV–vis absorption and Fluorescence spectra. The two complexes Dafo-Re and PADF-Re show metal-to-ligand charge transfer absorptions at ca.391nm, ca.394 nm and emissions at ca.492nm, ca.470nm, respectively.

How to interpret absorption and fluorescence spectra of charge transfer states in an organic solar cell

2018 ◽  
Vol 5 (5) ◽  
pp. 837-848 ◽  
Author(s):  
Frank-Julian Kahle ◽  
Alexander Rudnick ◽  
Heinz Bässler ◽  
Anna Köhler
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Solar Cell ◽  
Organic Solar Cells ◽  
Organic Solar Cell ◽  
Fluorescence Spectra ◽  
Photoluminescence Spectra ◽  
Absorption And Fluorescence Spectra ◽  
Energetic Disorder

Energetic disorder is crucial to consistently model both absorption and photoluminescence spectra of charge transfer states in organic solar cells.

scholarly journals Tetraphenylethylene-Substituted Bis(thienyl)imidazole (DTITPE), An Efficient Molecular Sensor for the Detection and Quantification of Fluoride Ions

Chemosensors ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 285
Author(s):  
Ranjith Kumar Jakku ◽  
Nedaossadat Mirzadeh ◽  
Steven H. Privér ◽  
Govind Reddy ◽  
Anil Kumar Vardhaman ◽  
...  
Keyword(s):  
Density Functional ◽  
Color Change ◽  
Spectroscopic Studies ◽  
Fluoride Ion ◽  
Fluoride Ions ◽  
Functional Theory ◽  
Naked Eye ◽  
Real World Application ◽  
Molecular Sensor ◽  
Detection And Quantification

Fluoride ion plays a pivotal role in a range of biological and chemical applications however excessive exposure can cause severe kidney and gastric problems. A simple and selective molecular sensor, 4,5-di(thien-2-yl)-2-(4-(1,2,2-triphenylvinyl)-phenyl)-1H-imidazole, DTITPE, has been synthesized for the detection of fluoride ions, with detection limits of 1.37 × 10−7 M and 2.67 × 10−13 M, determined by UV-vis. and fluorescence spectroscopy, respectively. The variation in the optical properties of the molecular sensor in the presence of fluoride ions was explained by an intermolecular charge transfer (ICT) process between the bis(thienyl) and tetraphenylethylene (TPE) moieties upon the formation of a N-H—F− hydrogen bond of the imidazole proton. The sensing mechanism exhibited by DTITPE for fluoride ions was confirmed by 1H NMR spectroscopic studies and density functional theory (DFT) calculations. Test strips coated with the molecular sensor can detect fluoride ions in THF, undergoing a color change from white to yellow, which can be observed with the naked eye, showcasing their potential real-world application.

Intermolecular-charge-transfer-induced fluorescence quenching in protic solvent

2016 ◽  
Vol 1123 ◽  
pp. 49-54 ◽  
Author(s):  
Tao Lin ◽  
Xiaojun Liu ◽  
Zhidong Lou ◽  
Yanbing Hou ◽  
Feng Teng
Keyword(s):  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Protic Solvent ◽  
Intermolecular Charge Transfer

scholarly journals Synthesis of Coumarin Based Chemo-Sensors for the Detection of CN¯ Ions

2021 ◽  
pp. 18-33
Author(s):  
Satadal Sengupta ◽  
◽  
Nilasish Pal ◽  
Anwesha Bhattacharyya ◽  
◽  
...  
Keyword(s):  
Charge Transfer ◽  
Side Effects ◽  
Nucleophilic Addition ◽  
Atomic Level ◽  
Absolute Necessity ◽  
Naked Eye ◽  
Intermolecular Charge Transfer ◽  
Life Saving ◽  
The Family ◽  
High Fluorescence

In the modern day, chemistry governs the very essence of life on a sub-atomic level from simple toothpaste to life-saving drugs, we depend on the chemicals that constitute the very essence of existence itself. Therefore, the detection and study of these chemicals recognized as an absolute necessity because along with pros comes the cons, i.e., the toxicity & the notorious side effects of the very same chemicals. Thus, certain compounds called ‘Chemo-sensors’ specialise in trapping target chemical entities which could be separated later or create specific fluorescent lights, making them visible to the naked eye. One such type of ‘fluorescent chemo-sensor is the family of chemicals called Coumarins. From the topic, we come across the family of Coumarins that can help detect the Cyanide ions (CN–) following the mechanism involving nucleophilic addition and intermolecular charge transfer (ICT), resulting in high fluorescence.

scholarly journals A Naked-Eye Fluoride Ion Recognition Based Vanilin Derivative Chemosensors

2019 ◽  
Vol 2 (2) ◽  
pp. 110
Author(s):  
R Rahmawati ◽  
Bambang Purwono ◽  
Sabirin Matsjeh
Keyword(s):  
Hydrogen Bond ◽  
Color Change ◽  
Colorimetric Detection ◽  
Bond Formation ◽  
Fluoride Ion ◽  
Bonding Mechanism ◽  
Fluoride Ions ◽  
Hydrogen Bond Formation ◽  
Naked Eye ◽  
Basic Anion

Two new receptors S2 and S6 were designed and synthesized based on benzimidazole and azo-benzimidazole synthesized from vanillin for the colorimetric detection of fluoride ion. The presence of nitro group in S2 and azo in S6 makes –OH  proton (binding site) acidic and therefore it could deprotonate with addition of basic anion such as fluoride. Hydroxyl (–OH) functionality which detects basic fluoride ions via hydrogen-bonding mechanism wich is mechanism involved in the color change of receptor R2 and R6, its mean that initial hydrogen bond formation of F− ion with –OH group.

scholarly journals Synthetic control over intra- and intermolecular charge transfer can turn on the fluorescence emission of non-emissive coumarin

2016 ◽  
Vol 4 (20) ◽  
pp. 4556-4567 ◽  
Author(s):  
Byung Hak Jhun ◽  
Kei Ohkubo ◽  
Shunichi Fukuzumi ◽  
Youngmin You
Keyword(s):  
Charge Transfer ◽  
Fluorescence Emission ◽  
Synthetic Control ◽  
Photoinduced Charge Transfer ◽  
Strong Fluorescence ◽  
Turn On ◽  
Intermolecular Charge Transfer ◽  
Coumarin Compounds ◽  
Photoinduced Charge

Photoinduced charge transfer was exploited in coumarin compounds to obtain strong fluorescence emission.

scholarly journals Self-assembly behaviors of perylene- and naphthalene-crown macrocycle conjugates in aqueous medium

2019 ◽  
Vol 15 ◽  
pp. 1203-1209
Author(s):  
Xin Shen ◽  
Bo Li ◽  
Tiezheng Pan ◽  
Jianfeng Wu ◽  
Yangxin Wang ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Aqueous Medium ◽  
Self Assembly ◽  
Fluorescence Spectra ◽  
Perylene Diimide ◽  
Absorption And Fluorescence Spectra ◽  
Naphthalene Diimide ◽  
Assembly Behavior ◽  
Quenching Phenomenon

The synthesis of conjugates of perylene diimide (PDI) and naphthalene diimide (NDI) modified with two benzo-21-crown-7 ethers (B21C7) are herein described. Their self-assembly behavior in various solvents was investigated particularly in aqueous medium, due to the recently discovered hydrophilic properties of B21C7 crown macrocycle. An unexpected fluorescence quenching phenomenon was observed in the PDI-B21C7 macrocycle conjugate in chloroform. The detailed UV–vis absorption and fluorescence spectra of these PDI/NDI derivatives in different solvents as well as their morphologies were investigated.

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