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

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.

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.1105 ◽

2011 ◽

Vol 239-242 ◽

pp. 1105-1108 ◽

Cited By ~ 1

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.

Download Full-text

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

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.7.8 ◽

2011 ◽

Vol 7 ◽

pp. 46-52 ◽

Cited By ~ 40

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.

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1104.131 ◽

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.

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.83 ◽

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.

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.940.11 ◽

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.

Download Full-text

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

MRS Proceedings ◽

10.1557/proc-271-319 ◽

1992 ◽

Vol 271 ◽

Cited By ~ 3

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.

Download Full-text