scholarly journals Synthesis, Crystal Structure and Fluorescence Spectrum of a Europium Compound [Eu(NO3)3(H2O)4]•(C10H9N2)2•(NO3)2

2013 ◽  
Vol 25 (15) ◽  
pp. 8418-8422
Author(s):  
Xiao-Ju Chen ◽  
Wei-Ji Hu ◽  
Yi Qin ◽  
Guo-Liang Zhao
Keyword(s):  
Crystal Structure ◽  
Fluorescence Spectrum ◽  
Europium Compound

Synthesis, Characterization and Luminescence of Europium, Terbium Complexes of 1,1'-(Pyridin-2,6-Diyl) Bis-3-P-Tolylpropane-1,3-Dione

2011 ◽  
Vol 306-307 ◽  
pp. 228-233
Author(s):  
Jin Liang Zhu ◽  
Sheng Li Liu ◽  
Liang Cai Yu ◽  
Tao Ouyang
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Fluorescence Spectrum ◽  
Ternary Complex ◽  
Luminescent Properties ◽  
Lanthanide Ions ◽  
Binary Complex ◽  
H Nmr ◽  
Terbium Complexes ◽  
Luminescent Compound

A new ligand, 1,1'-(pyridin-2,6-diyl)bis-3-p-tolylpropane-1,3-dione(H2L), was prepared and its crystal structure displays its enol isomer. The binary complex, Ln2L3·4H2O [Ln = Eu(III) and Tb(III)], were synthesized by the reaction of synthesized ligand (H2L) and Ln(III). With 1,10-phenanthroline (Phen) as the synergistic ligand, the ternary complex, Ln2L3(Phen)2 [Ln = Eu(III) and Tb(III)], were synthesized. The compounds were characterized by 1H-NMR spectroscopy, MS, IR, UV, DTA-TG and fluorescence spectrum. The luminescent properties of the ligand and its complexes were investigated and the results showed that the prepared ligand was a good luminescent compound, all complexes emitted characteristic luminescence of corresponding lanthanide ions and 1,10-phenanthroline as the synergistic ligand can obviously enhance the luminescence of Eu(III) in the ternary complex.

Crystal structure and fluorescence spectrum of 3Y2O3, WO3: Eu3+

1978 ◽  
Vol 13 (3) ◽  
pp. 175-185 ◽  
Author(s):  
Odile Beaury ◽  
Michèle Faucher ◽  
Paul Caro
Keyword(s):  
Crystal Structure ◽  
Fluorescence Spectrum

Crystal structure and fluorescence spectrum of the complex [Eu(III)(TTA)3(phen)]

2010 ◽  
Vol 17 (6) ◽  
pp. 637-643 ◽  
Author(s):  
Hu Mao-Lin ◽  
Huang Zhen-Yan ◽  
Cheng Ya-Qian ◽  
Wang Shm ◽  
Lin Juan-Juan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Fluorescence Spectrum

Synthesis, crystal-structure refinement and properties of bastnaesite-type PrF[CO3], SmF[CO3] and EuF[CO3]

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Constantin Buyer ◽  
Samira A. Schumacher ◽  
Thomas Schleid
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Aqueous Solution ◽  
Infrared Spectroscopy ◽  
Ultraviolet Radiation ◽  
Structure Refinement ◽  
Bulk Sample ◽  
Crystal Structure Refinement ◽  
Europium Compound ◽  
Red Luminescence

Abstract By adding a hot aqueous solution containing KF and K2[CO3] to another hot aquatic brine of Pr[NO3]3 ⋅ 5 H2O, Sm[NO3]3 ⋅ 5 H2O or Eu[NO3]3 ⋅ 5 H2O with a 1.3 times excess of the anion-providing solution, amorphous water-insoluble powders of PrF[CO3], SmF[CO3] and EuF[CO3] can be obtained. Through hydrothermal treatment at 210 °C for five days crystalline powders could be synthesized and their crystal structure was refined with Rietveld methods based on PXRD data. The named compounds crystallize in the bastnaesite-type structure with a = 710.912(12) pm, c = 976.811(6) pm for the praseodymium, a = 704.77(2) pm, c = 971.83(4) pm for the samarium and a = 700.734(6) pm, c = 969.066(8) pm for the europium compound, all hexagonal with Z = 6. Upon heating them, the compounds lose CO2 and fluoride oxides REFO emerge. Thermogravimetric experiments with crystalline samples show thermal stability up to 420 °C for PrF[CO3], 400 °C for SmF[CO3] and 340 °C for EuF[CO3], but decomposition below 200 °C for the amorphous ones. Infrared spectroscopy confirms only marginal portions of [OH]− instead of F− anions in all cases. The RE 3+ cations are coordinated by 9 + 2 anions at distances between 236 and 254 pm plus 326 pm to F− anions and oxygen atoms bonded to carbon as oxocarbonate anions [CO3]2−. Triggered by ultraviolet radiation, the bulk sample of EuF[CO3] shows a poor red luminescence.

A New Type of Divalent Europium Compound MEuPO4 (M = K, Rb, Cs), its Synthesis, Crystal Structure, and Properties

1992 ◽  
Vol 610 (4) ◽  
pp. 135-138 ◽  
Author(s):  
Guo-Quing Wu ◽  
Zhongjia Tang ◽  
Yongxian Yu ◽  
Pingdi Lin ◽  
M. Jansen ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure And Properties ◽  
Divalent Europium ◽  
New Type ◽  
Europium Compound

Crystal Structure Determination of Glycerol-Containing Lipids from Electron Diffraction Data. Use of Analog Compounds Based upon Configurational Isomers of Cyclopentane-1, 2, 3-TRIOL

1977 ◽  
Vol 35 ◽  
pp. 24-25
Author(s):  
Douglas L. Dorset ◽  
Anthony J. Hancock
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Diffraction Data ◽  
Structure Determination ◽  
Crystal Surface ◽  
Coherent Scattering ◽  
Crystal Structure Determination ◽  
Electron Diffraction Data ◽  
Polar Group ◽  
Axis Orientation

Lipids containing long polymethylene chains were among the first compounds subjected to electron diffraction structure analysis. It was only recently realized, however, that various distortions of thin lipid microcrystal plates, e.g. bends, polar group and methyl end plane disorders, etc. (1-3), restrict coherent scattering to the methylene subcell alone, particularly if undistorted molecular layers have well-defined end planes. Thus, ab initio crystal structure determination on a given single uncharacterized natural lipid using electron diffraction data can only hope to identify the subcell packing and the chain axis orientation with respect to the crystal surface. In lipids based on glycerol, for example, conformations of long chains and polar groups about the C-C bonds of this moiety still would remain unknown.One possible means of surmounting this difficulty is to investigate structural analogs of the material of interest in conjunction with the natural compound itself. Suitable analogs to the glycerol lipids are compounds based on the three configurational isomers of cyclopentane-1,2,3-triol shown in Fig. 1, in which three rotameric forms of the natural glycerol derivatives are fixed by the ring structure (4-7).

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

1983 ◽  
Vol 41 ◽  
pp. 518-519
Author(s):  
George G. Cocks ◽  
Louis Leibovitz ◽  
DoSuk D. Lee
Keyword(s):  
Crystal Structure ◽  
Crassostrea Virginica ◽  
Crystal Orientation ◽  
Developmental Changes ◽  
Gastrula Stage ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Stages Of Growth ◽  
Early Stages ◽  
Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

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