A New Schiff’s Base Fluorescent Sensor for the Selective Detection of Mercury Ion

2011 ◽  
Vol 239-242 ◽  
pp. 1105-1108 ◽  
Author(s):  
Xue Mei Wang ◽  
Hua Yan ◽  
Yong Chen ◽  
He Bin Bao
Keyword(s):  
Fluorescent Sensor ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Mercury Ion ◽  
Fluorescence Measurement ◽  
Fluorescence Emission Spectra ◽  
H Nmr ◽  
Complex Process ◽  
Characteristic Wavelength ◽  
Ft Ir

A new Hg2+-sensing and selective fluorescent sensor, 1-(1-pyrenecarboxaldehyd e)-thiocarbohydrazone, was synthesized and characterized by elemental analysis, FT-IR and 1H NMR spectra. Its fluorescence and recognition properties to the mercury ion were studied by the fluorescence emission spectra. With adding mercury ion into solution, the fluorescence emission intensities at different characteristic wavelength changed continually. Hence the ratiometric fluorescence measurement was used for detecting the complex process. It was found that a 1:1 stoichiometry complex is formed between the mercury ion and the compound with the association constants were 2.04×105 L/mol, respectively. And the detection limits of the mercury ion were 2.52×10-8 mol/L.

Study on a New Coumarin Derivative as Fluorescent Probe for Hg2+ Ions

2014 ◽  
Vol 904 ◽  
pp. 99-102
Author(s):  
Hong Qi Li ◽  
Zhen Chen ◽  
Hao Chen ◽  
Jia Wei Zhang ◽  
Yan Tai Chen ◽  
...  
Keyword(s):  
Metal Ions ◽  
Fluorescent Probe ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Coumarin Derivative ◽  
Emission Peak ◽  
Fluorescence Emission Spectra ◽  
Maximum Emission ◽  
H Nmr ◽  
C Nmr

A new coumarin derivative L was synthesized and characterized by1H NMR,13C NMR, IR and mass spectrum. UV-Vis and fluorescence emission spectra of L without or with different anions (NO2, F, Cl, HSO3, HSO4, AcO or NO3) or metal ions were measured, which showed while addition of anions or metal ions Mg2+, Zn2+, Ca2+, Cu2+, Ni2+, Co2+, Fe3+or Al3+led to decrease in intensity of the maximum emission peak at about 480 nm, addition of Hg2+ions caused increase in intensity of the maximum emission peak, suggesting that L may act as a fluorescent probe for detection of Hg2+ions.

A Novel Method for the Preparation of Nanoaggregates of Methoxy Polyethyleneglycol Linked Chitosan

2006 ◽  
Vol 6 (9) ◽  
pp. 2867-2873 ◽  
Author(s):  
Anandrao R. Kulkarni ◽  
Yu-Hsin Lin ◽  
Hsiang-Fa Liang ◽  
Wei-Chun Chang ◽  
Wesley Wei-Wen Hsiao ◽  
...  
Keyword(s):  
Fluorescence Emission ◽  
Emission Spectra ◽  
Gel Permeation Chromatography ◽  
Aqueous Solubility ◽  
Degree Of Substitution ◽  
Critical Aggregation Concentration ◽  
Fluorescence Emission Spectra ◽  
Simple Method ◽  
Ft Ir ◽  
Sensitive Property

In the study, methoxy polyethyleneglycol (MPEG) linked chitosan (PLC) with a different degrees of substitution were prepared using a novel yet simple method in the presence of formaldehyde in a solvent of formic acid and dimethylsulfoxide (DMSO). The obtained PLC was verified by the Fourier transformed infrared (FT-IR) and carbon nuclear magnetic resonance (13C-NMR) spectroscopy and by the gel permeation chromatography (GPC). The aqueous solubility of chitosan increased after chemically linking with MPEG and was found to depend on its degree of substitution. With a proper degree of substitution of MPEG on chitosan, PLC may undergo inter- and/or intra-molecular entanglements to produce nanoaggregates. The critical aggregation concentration (CAC) of PLC was determined by the fluorescence emission spectra of pyrene and was found to be 0.003 mg/ml. Measurements of the size distribution and zeta potential of the prepared nanoaggregates were carried out using a Zetasizer. The results suggested that as the degree of MPEG substitution increased, the size and polydispersity index of the prepared nanoaggregates decreased. The prepared nanoaggregates showed a pH-sensitive property and thus may be suitable for the development of drug delivery devices for tumors.

scholarly journals A new fluorescent chemosensor for fluoride anion based on a pyrrole–isoxazole derivative

2011 ◽  
Vol 7 ◽  
pp. 46-52 ◽  
Author(s):  
Zhipei Yang ◽  
Kai Zhang ◽  
Fangbin Gong ◽  
Shayu Li ◽  
Jun Chen ◽  
...  
Keyword(s):  
Density Functional ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Fluoride Anion ◽  
Fluorescence Emission Spectra ◽  
Functional Theory ◽  
Binding Motifs ◽  
H Nmr ◽  
Isoxazole Derivative ◽  
Fluoride Detection

Molecules containing polarized NH fragments that behave as anion-binding motifs are widely used as receptors for recognition and sensing purposes in aprotic solvents. We present here a new example of a receptor, 3-amino-5-(4,5,6,7-tetrahydro-1H-indol-2-yl)isoxazole-4-carboxamide (receptor 1), which contains pyrrole, amide and amino subunits. This receptor shows both changes in its UV–vis absorption and fluorescence emission spectra upon the addition of F−, resulting in highly selectivity for fluoride detection over other anions, such as Cl−, Br−, I−, HSO4 −, H2PO4 − and AcO− in CH3CN. 1H NMR titration, time-dependent density functional theory (TDDFT) calculations and other experiments confirm that the sensing process is brought about by deprotonation of the pyrrole-NH in receptor 1.

Influence of trimethoxy-substituted positions on fluorescence of heteroaryl chalcone derivatives

2011 ◽  
Vol 65 (6) ◽  
Author(s):  
Thitipone Suwunwong ◽  
Suchada Chantrapromma ◽  
Hoong-Kun Fun
Keyword(s):  
Aldol Condensation ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Fluorescent Properties ◽  
Fluorescence Emission Spectra ◽  
Strong Emission ◽  
X Ray ◽  
Methoxy Groups ◽  
Phenyl Rings ◽  
Ft Ir

AbstractThree series of heteroaryl chalcones, (E)-1-(2-pyridyl)-3-(X)prop-2-en-1-one (Ia-Ic), (E)-1-(2-thienyl)-3-(X)prop-2-en-1-one (IIa-IIc), and (E)-1-(2-furyl)-3-(X)prop-2-en-1-one (IIIa-IIIc), where X = 2,4,5-trimethoxyphenyl (for series a), X = 2,4,6-trimethoxyphenyl (for series b), and X = 3,4,5-trimethoxyphenyl (for series c) were synthesised using basic catalysed aldol condensation and characterised using 1H NMR and FT-IR spectroscopies. Compound IIa was also characterised by single crystal X-ray analysis. The absorption and fluorescence emission spectra of these compounds revealed that the absorption and fluorescence depended on the heterocycle rings and trimethoxysubstituted phenyl rings linked to the enone system. The position of methoxy groups substantially affected the fluorescent properties. Compounds Ia-IIIa containing the 2,4,5-trimethoxyphenyl moiety exhibited the red-shift phenomenon and strong emission fluorescence.

Synthesis and Optical Properties of some Novel Bis-1,3,4-Oxadiazoles

2015 ◽  
Vol 1104 ◽  
pp. 131-135
Author(s):  
Hua Liu ◽  
Lin Lu ◽  
Dun Jia Wang
Keyword(s):  
Optical Properties ◽  
Fluorescence Spectra ◽  
Fluorescence Emission ◽  
Chloroform Solution ◽  
Emission Spectra ◽  
Pyridine Derivatives ◽  
Fluorescence Emission Spectra ◽  
H Nmr ◽  
Uv Illumination ◽  
Oxadiazole Derivatives

Three 2,6-bis (1,3,4-oxadiazol-2-yl) pyridine derivatives were synthesized and their structures were conformed by1H NMR, FTIR, MS techniques and elemental analysis. The UV–Vis absorption and fluorescence emission spectra of these compounds were investigated in chloroform solution. The results showed that these bis-1,3,4-oxadiazole derivatives had broad and strong absorption at 278−302 nm in the UV–Vis spectra and exhibited fluorescence emission at 338 −367 nm under UV illumination in fluorescence spectra. It was found that the nature of the substituents at benzene ring in bis-1,3,4-oxadiazole derivatives had a significant impact on their photoluminescence behaviors.

A Fluorescence Ratiometric Probe for Imaging of Acidic pH in Living Cells

2013 ◽  
Vol 864-867 ◽  
pp. 83-87
Author(s):  
Ling Liang Long ◽  
Yan Jun Wu ◽  
Lin Wang
Keyword(s):  
Fluorescence Emission ◽  
Emission Spectra ◽  
Living Cells ◽  
Acidic Ph ◽  
X Ray Diffraction ◽  
Fluorescence Emission Spectra ◽  
H Nmr ◽  
Ph Imaging ◽  
Visible Effect ◽  
Ratiometric Probe

A new fluorescent probe 1, bearing a pyridine group as receptor for H+and a coumarin dye as fluorophore, was synthesized and characterized by1H NMR,13C NMR, ESI-Ms and single crystal X-ray diffraction analysis. The probe exhibited fluorescence ratiometric response to acidic pH. With decreasing of the pH from 8.32 to 2.49, the fluorescence emission spectra exhibited large red shift from 541 to 631 nm, with the emission ratios (I541/I631) changed dramatically from 25.9 to 0.08, and the pKavalue was calculated to be 5.45. Probe 1 exhibited high selectivity to pH, other interference species including metal ions and amino acid exerted no visible effect on probe 1 detecting pH. The intracellular pH imaging applications proved that the probe is suitable for monitoring acidic pH fluctuations in living cells.

The Synthesis of Polyethersulfone (PES) and its Derivatives as Polymer Light Emitting Diode (PLED) Material

2019 ◽  
Vol 811 ◽  
pp. 126-132
Author(s):  
Cyntia Stiani Anggraini ◽  
Deana Wahyuningrum ◽  
Anita Alni
Keyword(s):  
Light Emitting Diode ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Fluorescence Emission Spectrum ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
H Nmr ◽  
Ft Ir ◽  
Polymer Light Emitting Diode ◽  
Polymer Application

Nowadays some types of polymer are being developed as Polymer Light Emitting Diode (PLED) materials because they have some advantages compared to small molecule organic light emitting diode (SM-OLED). Polymers which have numerous conjugated double bonds can be used as PLED materials, such as the polyethersulfone (PES) and its derivatives. Therefore, further research on the synthesis of PES and its derivatives is needed to explore their potential as PLED materials. In this research, the synthesis of polyethersulfone has been performed utilizing Microwave Assisted Organic Synthesis (MAOS) method and subsequently the synthesized PES was being transformed into the nitrated PES (PES-NO2) and the aminated PES (PES-NH2) utilizing the conventional method (reflux). Polymer structure is elucidated through FT-IR and 1H-NMR spectrum. Polymer application as PLED material is characterized by fluorescence emission spectrum. The maximum wavelengths in the fluorecence emission spectra of polymer in NMP were 444 nm for PES, 356 nm and 444 nm for PES-NO2, also 440 nm for PES-NH2.Based on the various analyses of data, the synthesis of PES, PES-NO2, and PES-NH2 has been successfully performed and all of polymers have the potent to be used as PLED materials because of its ability to emit light (blue) in the visible area.

scholarly journals CdTe Quantum Dots Embedded in Multidentate Biopolymer Based on Salep: Characterization and Optical Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ghasem Rezanejade Bardajee ◽  
Zari Hooshyar
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Fluorescence Emission Spectra ◽  
Cdte Qds ◽  
Transmission Electron ◽  
Ft Ir

This paper describes a novel method for surface modification of water soluble CdTe quantum dots (QDs) by using poly(acrylic acid) grafted onto salep (salep-g-PAA) as a biopolymer. As-prepared CdTe-salep-g-PAA QDs were characterized by Fourier transform infrared (FT-IR) spectrum, thermogravimetric (TG) analysis, and transmission electron microscopy (TEM). The absorption and fluorescence emission spectra were measured to investigate the effect of salep-g-PAA biopolymer on the optical properties of CdTe QDs. The results showed that the optical properties of CdTe QDs were significantly enhanced by using salep-g-PAA-based biopolymer.

Optical Properties and Zinc Nitride Thin Films Prepared Using Magnetron Reactive Sputtering

2014 ◽  
Vol 940 ◽  
pp. 11-15
Author(s):  
Jun Qin Feng ◽  
Jun Fang Chen
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Near Infrared ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Sem Images ◽  
Fluorescence Emission Spectra ◽  
Glass Substrates ◽  
Zinc Nitride ◽  
Direct Band

Zinc nitride films were deposited by ion sources-assisted magnetron sputtering with the use of Zn target (99.99% purity) on 7059 glass substrates. The films were characterized by XRD, SEM and EDS, the results of which show that the polycrystalline zinc nitride thin film can be grown on the glass substrates, the EDS spectrum confirmed the chemical composition of the films and the SEM images revealed that the zinc nitride thin films have a dense structure. Ultraviolet-visible-near infrared spectrophotometer was used to study the transmittance behaviors of zinc nitride thin films, which calculated the optical band gap by Davis Mott model. The results of the fluorescence emission spectra show the zinc nitride would be a direct band gap semiconductor material.

Stress and Phase Transformation Phenomena in Oxide Films: Real-Time Spectroscopic Measurements

1992 ◽  
Vol 271 ◽  
Author(s):  
Gregory J. Exarhos ◽  
Nancy J. Hess
Keyword(s):  
Phase Transformation ◽  
Applied Pressure ◽  
Oxide Films ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Film Deposition ◽  
Optical Methods ◽  
Fluorescence Emission Spectra ◽  
Line Intensities ◽  
Deposition Parameters

ABSTRACTIn situ optical methods are reviewed for characterization of phase transformation processes and evaluation of residual stress in solution-deposited metastable oxide films. Such low density films most often are deposited as disordered phases making them prone to crystallization and attendant densification when subjected to increased temperature and/or applied pressure. Inherent stress imparted during film deposition and its evolution during the transformation are evaluated from phonon frequency shifts seen in Raman spectra (TiO2) or from changes in the laser-induced fluorescence emission spectra for films containing rare earth (Sm+3:Y3Al5O12) or transition metal (Cr+3 :Al2O3) dopants. The data in combination with measured increases in line intensities intrinsic to the evolving phase are used to follow crystallization processes in thin films. In general, film deposition parameters are found to influence the crystallite ingrowth kinetics and the magnitude of stress and stress relaxation in the film during the transformation. The utility of these methods to probe crystallization phenomena in oxide films will be addressed.

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