Fluorescence Spectra of Europium (III) Phthalate and Naphthalate and of Samarium (111), Europium (Ill), Terbium (III) and Dysprosium (III) Dipyridyl Complexes

1964 ◽  
Vol 19 (4) ◽  
pp. 434-439 ◽  
Author(s):  
Shyama P. Sinha ◽  
Chr. Klixbüll Jørgensen ◽  
R. Pappalardo
Keyword(s):  
Energy Transfer ◽  
Aqueous Solutions ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Line Emission ◽  
Emission Spectra ◽  
Main Constituent ◽  
Solid Samples ◽  
Methanolic Solution

The line emission spectra were measured at 300 °K and 78 °K in solid samples of europium (III) phthalate and naphthalate and in the α,α'-dipyridyl complexes Sm dip2 Cl3, 2 H2O; Eu dip2 Cl3, 2 H2O; Tb dip2(NO3)3 and Dy dip2(NO3)3, H2O. The gadolinium (III) compound Gd dip2 Cl3, 2 H2O shows a typical VAN UITERT effect of energy transfer from the main constituent to Eu (III) and Tb(III) present in the concentration range 0.01-0.1 mole %. The methanolic solution of Gd(III) does not exhibit such energy transfer, whereas Eu dip2+3 and aqueous solutions, probably of Eu phthal2- and Eu naphthal2-. fluoresce strongly at room temperature. However, the latter solution tends slowly to deposit crystalline salts.

scholarly journals Investigation of Y2.1Er0.9(ScxGa1−x)5O12 Matrix Components on the Spectral Properties around 3.0 μm by Micro-Pulling-Down Method

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 138
Author(s):  
Zhijiang Che ◽  
Jian Zhang ◽  
Baiyi Wu ◽  
Qiangqiang Hu ◽  
Wenxiang Mu ◽  
...  
Keyword(s):  
Fluorescence Spectra ◽  
Room Temperature ◽  
Lattice Vibration ◽  
Emission Spectra ◽  
X Ray Diffraction ◽  
Mid Infrared ◽  
X Ray ◽  
Electron Probe Microanalyzer ◽  
The Matrix ◽  
Crystal Fibers

Single crystal fibers of 30% Er3+-doped compound of Y3(ScxGa1−x)5O12 have been grown by using the micro-pulling down (μ-PD) technique successfully. Our main purpose is to tune the fluorescence properties by adjusting the ratios of Sc3+ and Ga3+ ions inside the matrix crystals. The crystal structures of the series compounds were measured and analyzed through X-ray diffraction (XRD) measurements. The components and doping elements distributions were measured by the X-ray Fluorescence spectrometry and electron-probe microanalyzer. The absorption and mid-infrared fluorescence spectra, including the fluorescent lifetime of Er3+:4I13/2 and 4I11/2 levels were measured and compared systematically at room temperature. Spectral analysis indicated that the fluorescent lifetime of Er3+:4I13/2 tended to shorten and the emission spectra began to show a red shift when the proportion of YSG increased in the compound. Furthermore, the Raman spectra were measured to reveal the variations of lattice vibration and phonon energy.

Room Temperature Fluorescence Gas Sensor Based on Coated TiO2 Nanoparticles

2013 ◽  
Vol 543 ◽  
pp. 373-376 ◽  
Author(s):  
Nurul Huda Yusoff ◽  
Muhamad Mat Salleh ◽  
Muhammad Yahaya
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Gas Sensor ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Emission Spectra ◽  
Selective Property ◽  
Organic Vapors ◽  
Volatile Organic ◽  
Sensing Sensitivity

Room temperature fluorescence gas sensor was developed based on TiO2 nanoparticles coated with porphyrin dye thin films. The porphyrin dye used for this experiment were Iron (III) meso-tetraphenylporphine chloride (IMTPPCl) and Manganase (III) 5,10,15,20 tetra (4-pyridyl)-21H, 23H porphine chloride tetrakis (metachloride). The sensing sensitivity was due to the changes of the emission spectra produce by the thin film when expose to the organic vapors from volatile organic compounds; ethanol, acetone and 2-propanol. Both thin films show good response toward volatile organic vapors. However, TiO2 nanoparticles with porphyrin; IMTPPCl thin film shows pronounced interaction, marked fluorescence spectra and more selective property, hence useful for chemical identification purpose.

Spectra Analysis of some Europium(III)/Terbium(III) Complexes

2016 ◽  
Vol 680 ◽  
pp. 558-561
Author(s):  
Wei Yang ◽  
Qiang Li ◽  
Yan Yan Zhang ◽  
Dan Yu Jiang ◽  
Jin Feng Xia
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Rare Earth Ions ◽  
Rare Earth Complexes ◽  
Spectra Analysis ◽  
Ultraviolet Spectra ◽  
Hydroxy Quinoline

a series of Eu(III)/Tb(III) complexes with а-thenoyl trifluoroacetone (HTTA), 8-hydroxy quinoline complexes were synthesized. The UV and fluorescence spectra of these complexes at room temperature were characterized. The results revealed that different energy transfer between rare earth ions and ligands.Keywords rare earth complexes, ultraviolet spectra, fluorescence spectra

scholarly journals Solid state fluorescence of proteins in high throughput mode and its applications

F1000Research ◽  
2013 ◽  
Vol 2 ◽  
pp. 82
Author(s):  
Saurabh Gautam ◽  
Munishwar N Gupta
Keyword(s):  
Solid State ◽  
High Throughput ◽  
Fluorescence Spectra ◽  
Tertiary Structure ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Red Shift ◽  
Solid Samples ◽  
Fluorescence Emission Spectra ◽  
Simple Method

A simple method to determine fluorescence emission spectra of proteins in solid state is described. The available commercial accessories can only accommodate solid samples and hence do not allow a direct comparison between fluorescence spectra of a sample in solution and solid state form. Such comparisons are valuable to monitor the changes in protein structure when it is “dried” or immobilized on a solid surface (for biocatalysis or sensor applications). The commercially available accessories also do not allow working in a high throughput mode. We describe here a simple method for recording fluorescence emission spectra of protein powders without using any dedicated accessory for solid samples. This method works with a 96-well plate format. It enables the comparison of fluorescence spectra of a sample in a solid state with solution spectra, using comparable quantities of protein. The fluorescence emission spectra were blue-shifted (4 to 9 nm), showed an increase in the intensity for different proteins studied upon lyophilization, and were similar to what has been reported by others using available commercial accessories for solid state samples. After validating that our method worked just as well as the dedicated accessories, we applied the method to compare the fluorescence emission spectra of α-chymotrypsin in solution, precipitated form and the lyophilized powder form. α-Chymotrypsin in solution showed a λmax of 335 nm while a high-activity preparation of the same enzyme for non-aqueous media, known as enzyme precipitated and rinsed with propanol (EPRP), showed an increase in the intensity of the fluorescence emission spectra. However, there was a small red shift of 2 nm (λmax of 337 nm) in contrast to lyophilized powder which showed a λmax of 328 nm. This is due to a difference in the tertiary structure of the protein as well as the microenvironment of aromatic residues between the two preparations. We further examined the fluorescence emission spectra of green fluorescent protein (GFP) in solution and solid form. The relative fluorescence intensity of lyophilized GFP powder was decreased significantly to 17% as compared to GFP in solution, and showed a red shift of 4 nm in the emission λmax. It was found that fluorescence resonance energy transfer (FRET) between tryptophan (Trp57) and the cyclic chromophore of GFP was significantly diminished. This indicated the change in the microenvironment around the cyclic chromophore in GFP upon lyophilization.

scholarly journals Low-Temperature Luminescent Studies of Emissive Guanine Substitute for the Detection of Biopolymers

2020 ◽  
Vol 65 (4) ◽  
pp. 317
Author(s):  
V. Yu. Kudrya ◽  
V. M. Yashchuk ◽  
A. P. Naumenko ◽  
Y. Mely ◽  
Ya. O. Gumenyuk
Keyword(s):  
Energy Transfer ◽  
Low Temperature ◽  
Optical Absorption ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Band Maximum ◽  
Frozen Solution ◽  
Buffer Solutions ◽  
Long Wave ◽  
Fluorescence And Phosphorescence

The optical absorption at 300 K and the fluorescence and phosphorescence at 78 K of the emissive guanine substitute, deoxythienoguanosine, (dthG) were investigated in aqueous and TRIS-HCl-buffer solutions. Two optical absorption and fluorescence centers at room temperature were attributed to two keto-enol tautomers of dthG, which confirms previously obtained results. In contrast to room temperature, only one emission band was observed at 78 K in fluorescence spectra that was close to the long-wave fluorescence band at room temperature and could be associated with the tautomer with long-wave absorption. This phenomenon can be explained by the energy transfer by excitations in a frozen solution between two types of the optical centers mentioned above. The similar conclusion is drawn for the phosphorescence: only one tautomer phosphorescence band is observed. The spectral positions of this band maximum are essentially different for aqueous and buffer solutions (∼50 nm).

Comparison of emission spectra of CuCl2 obtained via energy transfer from O2(1Δg) with laser-induced fluorescence spectra

1991 ◽  
Vol 184 (1-3) ◽  
pp. 133-140 ◽  
Author(s):  
A.J. Bouvier ◽  
R. Bacis ◽  
J. Bonnet ◽  
S. Churassy ◽  
P. Crozet ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Emission Spectra ◽  
Laser Induced Fluorescence

Optical Spectra of Chlorophyll a and b Molecules and Complexes in PMMA and MTHF

1978 ◽  
Vol 33 (10) ◽  
pp. 1197-1205
Author(s):  
W. Hägele ◽  
D. Schmid ◽  
F. Drissler ◽  
J. Nauš ◽  
H. C. Wolf
Keyword(s):  
Energy Transfer ◽  
Chlorophyll A ◽  
Fluorescence Spectra ◽  
Emission Spectra ◽  
Optical Spectra ◽  
Chlorophyll B ◽  
High Concentration ◽  
Transfer Processes ◽  
Wide Range ◽  
Chlorophyll A And B

AbstractThe optical spectra of chlorophyll a and chlorophyll b in PMMA and MTHF were studied over a wide range of concentration (8 X 10-6-1 X 10-3 mole/l in PMMA, and 10-6-10-1 mole/l in MTHF). In the absorption spectra it is possible to identify bands which originate from chlorophyll disolvates and chlorophyll monosolvates in MTHF as well as bands which are most probably due to isolated chlorophyll molecules in PMMA. In high-concentration samples of chlorophyll in MTHF some bands may be assigned to aggregates, but based on optical results only, no particular model can be proposed. The emission spectra are strongly influenced by reabsorption and energy transfer processes. However, the so-called Qy band of isolated molecules in PMMA and of chlorophyll monosolvates in MTHF as well as the Qx and the Qy bands of chlorophyll disolvates in MTHF can be identified unequivocally in the fluorescence spectra.

scholarly journals Оптические свойства нанокластеров серебра, синтезированных в поверхностно-привитой полиакриловой кислоте при разных плотностях прививки

2019 ◽  
Vol 126 (2) ◽  
pp. 220
Author(s):  
А.А. Горбачев ◽  
Н.И. Сушко ◽  
П.П. Першукевич ◽  
О.Н. Третинников
Keyword(s):  
Polyacrylic Acid ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Substrate Surface ◽  
Emission Spectra ◽  
Silver Nanoclusters ◽  
Plastic Substrate ◽  
Absorption And Fluorescence Spectra ◽  
Grafting Density ◽  
Polymer Template

AbstractFluorescent silver nanoclusters immobilized on a plastic substrate are obtained by photoinduced template synthesis using polyacrylic acid chemically grafted to the substrate surface as a template. The electronic absorption and fluorescence spectra of nanoclusters are studied depending on the polyacrylic acid grafting density. It is found that the optical absorption and fluorescence intensities of nanoclusters monotonically increase with increasing grafting density. The position and shape of the absorption and emission spectra almost do not change. The higher the polymer template grafting density, the higher the fluorescence stability of samples during storage at room temperature.

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