Colorimetric Anion Sensing and Color Imaging Based on Catalyzed Deprotection in a New Azonaphthol Chromophore

2006 ◽  
Vol 6 (11) ◽  
pp. 3551-3554
Author(s):  
Moon Soo Choi ◽  
Il Hoon Cho ◽  
Won Seok Lyoo ◽  
Taek Seung Lee
Keyword(s):  
Absorption Spectrum ◽  
Color Change ◽  
Hydroxyl Group ◽  
Color Imaging ◽  
Anion Sensing ◽  
Eye Color ◽  
Naked Eye

We synthesized an ortho-phenylazonaphthol compound of which hydroxyl group was protected by a thermo-labile tert-butoxycarbonyl (t-Boc) group, in which hydroxyazo- and hydrazone-tautomerism could be blocked. The chromophore obtained by protection with t-Boc group was exclusively present as a hydroxyazo tautomer and exhibited blue-shifted absorption spectrum compared to their parent azohydrazone tautomerizing chromophore. With this compound, we performed colorimetric anion sensing based on the deprotection-induced possible azohydrazone formation in dye chromophore subsequently resulting in naked-eye color change. Besides, the t-Boc protected chromophore could be used as a color imaging material via thermolysis of thermo-labile t-Boc groups resulting in formation of azohydrazone form with red shifted absorption.

A new phenothiazine-based fluorescent probe for detection of hydrazine with naked-eye color change properties

2021 ◽  
Author(s):  
Nian Rao ◽  
Yi Le ◽  
Dan Li ◽  
Yan Zhang ◽  
Qin Wang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Color Change ◽  
Eye Color ◽  
Naked Eye

scholarly journals Detection of organic amines using a ratiometric chromophoric fluorescent probe with a significant emission shift

2020 ◽  
Vol 44 (7-8) ◽  
pp. 475-481
Author(s):  
Dan Wu ◽  
Yi Liu ◽  
Fei Zheng ◽  
Shi-Qi Rong ◽  
Tao Yang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Nucleophilic Addition ◽  
High Selectivity ◽  
Color Change ◽  
Intramolecular Charge Transfer ◽  
Signaling Mechanism ◽  
Eye Color ◽  
Naked Eye ◽  
Spectrometric Measurements ◽  
Organic Amines

Taking advantages of both the well-known α,β-unsaturated structure and the special nucleophilicity of organic amines toward its acceptor moieties, intramolecular charge transfer as a signaling mechanism is used to design and synthesize a new ratiometric chromophoric fluorescent probe (BI-CA-ID) with large emission shifts toward organic amines. This probe is employed for the detection of organic amines with high selectivity and sensitivity and a “naked-eye” color change (from red to colorless). Ultraviolet–visible and fluorescence spectrometric measurements are used to determine detection limits as low as 0.024 and 0.43 μM. Furthermore, nucleophilic addition of the amine on the α,β-unsaturated of BI-CA-ID indicated that the sensing mechanism occurs via interruption of the π-conjugation.

scholarly journals A new rhodamine fluorescent OFF-ON-OFF probe for selective sensing of Fe3+ and AcO- in aqueous media and living cells

2018 ◽  
Vol 238 ◽  
pp. 04002
Author(s):  
Qinglei Liu ◽  
Huimin Liu ◽  
Yanan Lei ◽  
Yan Gao ◽  
Bing Zhao
Keyword(s):  
Fluorescence Probe ◽  
Color Change ◽  
Aqueous Media ◽  
Living Cells ◽  
Eye Color ◽  
Naked Eye ◽  
Fluorescent Response ◽  
Good Biocompatibility ◽  
Anions And Cations ◽  
Displacement Approach

A new fluorescent chemosensor for Fe3+ was developed based on a rhodamine platform. L displayed highly selective and sensitive “OFF-ON” fluorescence response and naked-eye color change to Fe3+ in aqueous solution. The resulting L-Fe3+ complex was found to act as a selective“ ON-OFF” fluorescence probe for AcO- against common anions and cations with a Fe3+ displacement approach. The detection limits of L to Fe3+ and L-Fe3+ complex to AcO- were estimated to be 6.04×10-8 mol/L and 7.51×10-8 mol/L, respectively. The good biocompatibility of L enabled the investigation of fluorescent response for Fe3+ and AcO- in living Ana-1 cells by confocal microscope.

Rhodamine–benzothiazole conjugate as an efficient multimodal sensor for Hg2+ ions and its application to imaging in living cells

2018 ◽  
Vol 42 (14) ◽  
pp. 11665-11672 ◽  
Author(s):  
Perumal Sakthivel ◽  
Karuppannan Sekar ◽  
Gandhi Sivaraman ◽  
Subramanian Singaravadivel
Keyword(s):  
Rhodamine B ◽  
Color Change ◽  
Living Cells ◽  
Fluorescence Response ◽  
Eye Color ◽  
Naked Eye ◽  
Turn On ◽  
Rhodamine B Dye

A rhodamine B dye bearing a benzothiazole conjugate is designed and synthesized, it shows a highly selective and sensitive naked-eye color change and turn-on fluorescence response to Hg2+ ions.

Moisture-Responsive Behavior in the Azophenolic Ionic Liquid Solution Accompanied by a Naked-Eye Color Change

2019 ◽  
Vol 35 (6) ◽  
pp. 624-629 ◽  
Author(s):  
Mingguang PAN ◽  
◽  
Yongsheng ZHAO ◽  
Xiaoqin ZENG ◽  
Jianxin ZOU ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Color Change ◽  
Liquid Solution ◽  
Eye Color ◽  
Naked Eye ◽  
Responsive Behavior ◽  
Ionic Liquid Solution

scholarly journals Multifunctional sensors based on liquid crystals scaffolded in nematic polymer networks

RSC Advances ◽  
2021 ◽  
Vol 11 (61) ◽  
pp. 38694-38702
Author(s):  
Xiyun Zhan ◽  
Dan Luo ◽  
Kun-Lin Yang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Temperature Change ◽  
Color Change ◽  
Polymer Network ◽  
Polymer Networks ◽  
Eye Color ◽  
Naked Eye ◽  
Nematic Polymer

Naked-eye color change as a result of temperature change or VOC exposure was demonstrated in a nematic polymer network-stabilized liquid crystal (PNLC) system.

Fluoride anion sensing using colorimetric reagents containing binaphthyl moiety and urea binding site

2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Roman Mikláš ◽  
Peter Kasák ◽  
Ferdinand Devínsky ◽  
Martin Putala
Keyword(s):  
Color Change ◽  
Colorimetric Detection ◽  
Fluoride Anion ◽  
Urea Derivatives ◽  
Anion Sensing ◽  
Naked Eye ◽  
Spectral Changes ◽  
Light Yellow ◽  
Nmr Data ◽  
Sensor Molecules

AbstractFour 1,1′-binaphthalene based bis-urea derivatives bearing aryl groups at end-on nitrogen atoms IIIa–d were synthesized as potential sensor molecules. These receptors show characteristic UV-VIS spectral changes on complexation with anions and they exhibit selective recognition of F− over other halide anions. Interaction of a fluoride anion with urea NH groups was confirmed by 1H NMR data. The presence of an electron-withdrawing nitro group in N′-aryls (receptors IIIa and IIIb) appeared to be necessary for naked-eye colorimetric detection. These receptors show dramatic color change from light-yellow to orange (IIIa) or to orange-red (IIIb) in the presence of guest fluoride anions already at concentrations of 10−5 mol dm−3 of the receptor and host.

scholarly journals Methyl-3-(2-hidroxy-5-nitrophenyl amino)-3-phenylpropanoate Based Colorimetric Sensor for Oxyanions

2020 ◽  
Vol 20 (2) ◽  
pp. 257
Author(s):  
Venty Suryanti ◽  
Fajar Rakhman Wibowo ◽  
Sekar Handayani
Keyword(s):  
Absorption Spectroscopy ◽  
Binding Sites ◽  
Color Change ◽  
Colorimetric Sensor ◽  
Anion Sensor ◽  
Anion Sensing ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Light Yellow

A colorimetric anion sensor of methyl-3-(2-hydroxy-5-nitrophenyl amino)-3-phenylpropanoate bearing –OH and –NH groups as binding sites and nitrophenyl as a signaling unit, has been successfully accomplished. The compound functioned as a colorimetric chemosensor for H2PO4– and AcO–, in particular, the sensor showed significant naked-eye detectable color change from colorless to light yellow. In contrast, no color change was detected upon addition of other anions such as SO42–, NO3–, and CIO4–. The anion sensing ability of the sensor was further investigated by UV-Vis absorption spectroscopy in acetone. Characteristic UV-Vis spectra changes were revealed upon addition of H2PO4– and AcO–.

scholarly journals Recent Advancements in Enzyme-Based Lateral Flow Immunoassays

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3358
Author(s):  
Donato Calabria ◽  
Maria Maddalena Calabretta ◽  
Martina Zangheri ◽  
Elisa Marchegiani ◽  
Ilaria Trozzi ◽  
...  
Keyword(s):  
Lateral Flow ◽  
Qualitative Information ◽  
Eye Color ◽  
Commercial Success ◽  
Color Changes ◽  
Naked Eye ◽  
Future Developments ◽  
Highly Sensitive ◽  
Critical Overview ◽  
Detection Technologies

Paper-based lateral-flow immunoassays (LFIAs) have achieved considerable commercial success and their impact in diagnostics is continuously growing. LFIA results are often obtained by visualizing by the naked eye color changes in given areas, providing a qualitative information about the presence/absence of the target analyte in the sample. However, this platform has the potential to provide ultrasensitive quantitative analysis for several applications. Indeed, LFIA is based on well-established immunological techniques, which have known in the last year great advances due to the combination of highly sensitive tracers, innovative signal amplification strategies and last-generation instrumental detectors. All these available progresses can be applied also to the LFIA platform by adapting them to a portable and miniaturized format. This possibility opens countless strategies for definitively turning the LFIA technique into an ultrasensitive quantitative method. Among the different proposals for achieving this goal, the use of enzyme-based immunoassay is very well known and widespread for routine analysis and it can represent a valid approach for improving LFIA performances. Several examples have been recently reported in literature exploiting enzymes properties and features for obtaining significative advances in this field. In this review, we aim to provide a critical overview of the recent progresses in highly sensitive LFIA detection technologies, involving the exploitation of enzyme-based amplification strategies. The features and applications of the technologies, along with future developments and challenges, are also discussed.

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