Chromogenic ‘naked eye’ and fluorogenic ‘turn on’ sensor for mercury metal ion using thiophene-based Schiff base

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 65731-65738 ◽  
Author(s):  
Divya Singhal ◽  
Neha Gupta ◽  
Ashok Kumar Singh
Keyword(s):  
Schiff Base ◽  
Binding Affinity ◽  
Metal Ion ◽  
Limit Of Detection ◽  
Electrochemical Behaviour ◽  
Naked Eye ◽  
Turn On

2-((3-Methylthiophen-2-yl)methyleneamino)benzenethiol (Probe 1) is selective for Hg2+. The binding affinity of Hg2+ with Probe 1 was confirmed by DFT and electrochemical behaviour. The limit of detection was 20 μM with 2 : 1 stoichiometry of 1 + Hg2+ complex.

Synthesis of Mesoporous Silica Monoliths — A Novel Approach Towards Fabrication of Solid-State Optical Sensors for Environmental Applications

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660014 ◽  
Author(s):  
D. Prabhakaran ◽  
C. Subashini ◽  
M. Akhila Maheswari
Keyword(s):  
Solid State ◽  
Mesoporous Silica ◽  
Optical Sensors ◽  
Metal Ion ◽  
Limit Of Detection ◽  
Mesoporous Structure ◽  
High Specific Surface Area ◽  
Solution Ph ◽  
Silica Monoliths ◽  
Naked Eye

Mesoporous silica monoliths are an attractive area of research owing to their high specific surface area, uniform channels and mesoporous size (2–30[Formula: see text]nm). This paper deals with the direct templating synthesis of a mesoporous worm-like silica monolithic material using F127 — a triblock copolymer, by micro-emulsion technique using trimethyl benzene (TMB), as the solvent. The synthesized silica monolith is characterized using SEM-EDAX, XRD, BET, NMR and FT-IR. The monolith shows an ordered worm-like mesoporous structure with tuneable through pores, an excellent host for the anchoring of chromo-ionophores for the naked-eye metal ion-sensing. The mesoporous monoliths were loaded with 4-dodecyl-6-(2-pyridylazo)-phenol (DPAP) ligand through direct immobilization, thereby acting as solid-state naked-eye colorimetric ion-sensors for the sensing toxic Pb[Formula: see text] ions at parts-per-billion (ppb) level in various industrial and environmental systems. The influence of various experimental parameters such as solution pH, limiting ligand loading concentration, amount of monolith material, matrix tolerance level, limit of detection and quantification has been studied and optimized.

A Colorimetric and “Turn-On” Fluorescent Chemosensor for Metal Ion Based on Rhodamine Derivative

2014 ◽  
Vol 955-959 ◽  
pp. 267-270
Author(s):  
Hao Zhang ◽  
Xi Jiang
Keyword(s):  
Schiff Base ◽  
High Throughput ◽  
Chemical Sensors ◽  
High Throughput Screening ◽  
Metal Ion ◽  
Important Species ◽  
Rhodamine Derivative ◽  
Turn On ◽  
Highly Sensitive ◽  
Rhodamine Derivatives

The recognition and sensing of biologically and environmentally important species has emerged as a significant goal in the field of chemical sensors in recent years1. Fluorogenic methods in conjunction with suitable probes are preferable approaches for the measurement of these analytes because fluorimetry is rapidly performed, is nondestructive, is highly sensitive, is suitable for high-throughput screening applications2,3. We synthesized rhodamine derivatives compounds by a Schiff base reaction.

A hydrazine-based thiocarbamide probe for colorimetric and turn-on fluorometric detection of PO43− and AsO33− in semi-aqueous medium

2018 ◽  
Vol 42 (8) ◽  
pp. 6236-6246 ◽  
Author(s):  
Rakesh Purkait ◽  
Suvendu Maity ◽  
Chittaranjan Sinha
Keyword(s):  
At Risk ◽  
Aqueous Medium ◽  
West Bengal ◽  
Limit Of Detection ◽  
Fluorometric Detection ◽  
Naked Eye ◽  
Turn On

20% of the population in West Bengal, India is at risk to fatal levels of arsenic. Easy detection of As(iii) is demonstrated by the naked eye using a hydrazine-based thiocarbamide reagent. Limit of detection is 15 nM (AsO33−) at pH 8–12.

A naked-eye colorimetric sensor for methanol and ‘turn-on’ fluorescence detection of Al3+

2019 ◽  
Vol 43 (47) ◽  
pp. 18582-18589 ◽  
Author(s):  
Virendra Kumar ◽  
Subhankar Kundu ◽  
Bahadur Sk ◽  
Abhijit Patra
Keyword(s):  
Schiff Base ◽  
Fluorescence Detection ◽  
Cost Effective ◽  
Colorimetric Sensor ◽  
Naked Eye ◽  
Turn On ◽  
Schiff Base Compound ◽  
Base Compound

A multifunctional Schiff base compound, NRSB, having a rhodanine scaffold was fabricated by a simple and cost-effective protocol.

scholarly journals Trivalent Cations Detection of Magnetic-Sensitive Microcapsules by Controlled-Release Fluorescence Off-On Sensor

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1801
Author(s):  
Bo-Wei Du ◽  
Ching-Chang Lin ◽  
Fu-Hsiang Ko
Keyword(s):  
Magnetic Field ◽  
Controlled Release ◽  
Quantum Interference ◽  
Metal Ion ◽  
Limit Of Detection ◽  
Tap Water ◽  
One Pot ◽  
Turn On ◽  
Trivalent Cations ◽  
Fluorescence Turn On

A pyrene-based derivative, 2-((pyrene-1-ylmethylene)amino)ethanol (PE) nanoparticle, was encapsulated via water-in-oil-in-water (W/O/W) double emulsion with the solvent evaporation method by one-pot reaction and utilized as a fluorescence turn-on sensor for detecting Fe3+, Cr3+, and Al3+ ions. Magnetic nanoparticles (MNPs) embedded in polycaprolactone (PCL) were used as the magnetic-sensitive polyelectrolyte microcapsule-triggered elements in the construction of the polymer matrix. The microcapsules were characterized by ultraviolet–visible (UV–Vis) and photoluminescence (PL) titrations, quantum yield (Φf) calculations, 1H nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and superconducting quantum interference device magnetometry (SQUID) studies. This novel responsive release of the microcapsule fluorescence of the turn-on sensor for detecting trivalent cations was due to the compound PE and the MNPs being incorporated well within the whole system, and an effective thermal and kinetic energy transfer between the core and shell structure efficiently occurred in the externally oscillating magnetic field. The magnetic-sensitive fluorescence turn-on microcapsules show potential for effective metal ion sensing in environmental monitoring and even biomedical applications. Under the optimal controlled-release probe fluorescence conditions with high-frequency magnetic field treatment, the limit of detection (LOD) reached 1.574–2.860 μM and recoveries ranged from 94.7–99.4% for those metals in tap water.

scholarly journals Synthesis and Spectral Studies of Schiff Base Receptor for Fluorescence Detection of Hg(II)

2019 ◽  
Vol 31 (3) ◽  
pp. 527-532 ◽  
Author(s):  
Chinnadurai Anbuselvan
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Spectral Studies ◽  
Titration Method ◽  
Film Sensor ◽  
Sensitivity And Selectivity ◽  
Metal Ion Detection

In this study, a fluorescent film probe with a structure centered on a Schiff base viz. (N1′,N2′)-N1,N2-bis(2-amino-3,5-dibromobenzylidene)-1,2-diamine (DAB) was synthesized. The probe was used as a fluorescence chemosensor for transition metal ion detection in an aqueous medium. Fluorescence was measured through fluorescence spectroscopy, and the emission maximum of the proposed sensor was 552 nm. Furthermore, the proposed film sensor exhibited a high sensitivity and selectivity toward Hg2+ ions. The limit of detection (LOD) of chemosensor, which was calculated using the fluorescence titration method, found to be 2.11 μM at 552 nm. The fluorescence spectroscopic data evidenced the potential of the proposed sensor for application in the detection and determination of Hg2+ ions in deionized water without the interference from other metal ions.

scholarly journals A Naked-Eye Visible Colorimetric and Ratiometric Chemosensor Based on Schiff Base for Fluoride Anion Detection

2020 ◽  
Author(s):  
Liu Yang ◽  
Yu-Long Liu ◽  
Cheng-Guo Liu ◽  
Ying Fu ◽  
Fei Ye
Keyword(s):  
Schiff Base ◽  
Limit Of Detection ◽  
Fluoride Anion ◽  
Dmso Solution ◽  
Binding Model ◽  
Anion Detection ◽  
Real Samples ◽  
Color Changes ◽  
Naked Eye ◽  
Ratiometric Probe

A dual-platform colorimetric and ratiometric chemosensor, namely 6-(2-hydroxynaphthalen)-N-n-butyl-naphthalimide (HNA), based on Schiff base constructed from N-n-butyl-4-amino-1,8-naphthalimide and 2-hydroxy-1-naphthaldehyde has been designed and fabricated for detecting fluoride anion (F−) in DMSO solution. HNA is a colorimetic and ratiometric probe with superior selectivity and sensitivity. The color changes of HNA from yellow to purple was observed by the naked eyes in the presence of F−. The absorbance in the UV-Vis spectra of HNA was decreasing in 422 nm, while gradually increasing in 583 nm by adding F−. The limit of detection (LOD) of HNA for detecting F− is low to 0.61 μM and the binding model of HNA and F− is in 3:2 stoichiometry. Meanwhile, HNA can be used to detect F− in real samples. Finally, the mechanism of HNA for the detection of F− was investigated. The present work indicated that HNA would be a superior potential chemosensor in monitoring F− selectively and sensitively.

Efficient Preconcentration of Cu2+, Zn2+ and Fe3+ with an Agarose-Schiff Base Sorbent

2007 ◽  
Vol 72 (7) ◽  
pp. 908-916 ◽  
Author(s):  
Payman Hashemi ◽  
Hatam Hassanvand ◽  
Hossain Naeimi
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Ion ◽  
Good Accuracy ◽  
Kinetic Studies ◽  
Sample Volume ◽  
Effects Of Ph ◽  
Glass Column ◽  
High Concentrations ◽  
Ph Range

Sorption and preconcentration of Cu2+, Zn2+ and Fe3+ on a salen-type Schiff base, 2,2'- [ethane-1,2-diylbis(nitrilomethylidyne)]bis(2-methylphenol), chemically immobilized on a highly crosslinked agarose support, were studied. Kinetic studies showed higher sorption rates of Cu2+ and Fe3+ in comparison with Zn2+. Half-times (t1/2) of 31, 106 and 58 s were obtained for sorption of Cu2+, Zn2+ and Fe3+ by the sorbent, respectively. Effects of pH, eluent concentration and volume, ionic strength, buffer concentration, sample volume and interferences on the recovery of the metal ions were investigated. A 5-ml portion of 0.4 M HCl solution was sufficient for quantitative elution of the metal ions from 0.5 ml of the sorbent packed in a 6.5 mm i.d. glass column. Quantitative recoveries were obtained in a pH range 5.5-6.5 for all the analytes. The volumes to be concentrated exceeding 500 ml, ionic strengths as high as 0.5 mol l-1, and acetate buffer concentrations up to 0.3 mol l-1 for Zn2+ and 0.4 mol l-1 for Cu2+ and Fe3+ did not have any significant effect on the recoveries. The system tolerated relatively high concentrations of diverse ions. Preconcentration factors up to 100 and detection limits of 0.31, 0.16 and 1.73 μg l-1 were obtained for Cu2+, Zn2+ and Fe3+, respectively, for their determination by a flame AAS instrument. The method was successfully applied to the metal ion determinations in several river water samples with good accuracy.

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