Preparation and Characterization of Stable Molecular Glasses of Europium(III) Acyl-Alaninate Complexes

2018 ◽  
Vol 271 ◽  
pp. 34-39 ◽  
Author(s):  
Naren Gerile ◽  
H. Alata ◽  
Tian Xiao ◽  
Ta Na Bao ◽  
Ojin Tegus
Keyword(s):  
Structural Information ◽  
Glassy State ◽  
Europium Complexes ◽  
Molecular Glasses ◽  
Xrd Diffraction ◽  
Polarizing Microscope ◽  
Chemical Reaction Method ◽  
The Eu ◽  
Eu Complexes

Working with acylaminocarboxylate ligands, we used ethanol and water as a solvent, and the europium complexes were prepared using a chemical reaction method in solution. The elements were analyzed and characterized by polarizing microscope and XRD, respectively. The surfaces of complexes in the solid state were observed by polarizing microscope morphology. XRD diffraction data confirms the periodic long range order/disorder structure of these europium complexes. We also found that diversified material was easily formed by the rare earth complexes. Using the above tests, the structural information of the Eu complexes in the glassy state, liquid crystal glassy state and crystalline states was obtained

scholarly journals Luminescence Properties of Mesoporous Silica Nanoparticles Encapsulating Different Europium Complexes: Application for Biolabelling

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
S. Lechevallier ◽  
J. Jorge ◽  
R. M. Silveira ◽  
N. Ratel-Ramond ◽  
D. Neumeyer ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Europium Complexes ◽  
Full Characterization ◽  
Dye Release ◽  
Silica Wall ◽  
The Eu ◽  
Eu Complexes

In this work we have synthesized and characterized new hybrid nanoplatforms for luminescent biolabeling based on the concept of Eu3+complexes encapsulation in mesoporous silica nanoparticles (≈100 nm). Eu complexes have been selected on the basis of their capability to be excited at 365 nm which is a currently available wavelength, on routine epifluorescence microscope. For Eu complexes encapsulation, two different routes have been used: the first route consists in grafting the transition metal complex into the silica wall surface. The second way deals with impregnation of the mesoporous silica NPs with the Eu complex. Using the second route, a silica shell coating is realized, to prevent any dye release, and the best result has been obtained using Eu-BHHCT complex. However, the best solution appears to be the grafting of Eu(TTA)3-Phen-Si to mesoporous silica NPs. For this hybrid, mSiO2-Eu(TTA)3(Phen-Si) full characterization of the nanoplatforms is also presented.

Photoluminescence Properties of Europium Complexes Encapsulated into MSBA-15

2013 ◽  
Vol 760-762 ◽  
pp. 483-486
Author(s):  
Su Wen Li ◽  
Ming Yue
Keyword(s):  
Crystal Field ◽  
Relative Intensity ◽  
Electron Transition ◽  
Emission Lines ◽  
Photoluminescence Properties ◽  
Europium Complexes ◽  
The Eu ◽  
Eu Complexes ◽  
Pure Complex

The Eu complexes-Eu (TTA)3phen (TTA: thenoyltrifluoroacetone, phen: 1,10-phenanthroline) were encapsulated, uniformly distributed into the channels of the modified SBA-15 (labeled with MSBA-15), and structurally characterized. The photoluminescence properties of the encapsulated complexes were systematically studied in contrast to the pure complexes. The results indicate that the excitation bands assigned to the π-π* electron transition of the ligands for Eu3+complexes in encapsulated complexes were split into different components, and the5D0-7F0transitions became partly allowed. The emission lines for the5D0-7F2transitions became broader and the relative intensity for different crystal field components varied greatly in comparison to the pure complex. Most importantly, the photostability and thermostability of the emissions improved considerably.

Synthesis and Luminescence Properties of Three Europium Complexes with Phenanthroline Derivatives and β-Diketonates

2012 ◽  
Vol 455-456 ◽  
pp. 671-676
Author(s):  
Chao Long Yang ◽  
Jian Xin Luo ◽  
Li Yan Liang ◽  
Man Geng Lu
Keyword(s):  
Quantum Efficiency ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
Europium Complexes ◽  
Element Analysis ◽  
H Nmr ◽  
Characteristic Emission ◽  
Ft Ir ◽  
The Eu ◽  
Eu Complexes

Three novel Eu-complexes based on phenanthroline derivatives as second ligands have been synthesized and characterized by element analysis, 1H NMR, FT-IR, UV-vis, and PL. The luminescence spectra presented characteristic emission lines of Eu3+ ion. The results of luminescence spectra indicated that the Eu3+ ion occupied only a single site, and the ligand filed surrounding the Eu3+ ion was highly polarizable. Meanwhile, all complexes exhibited relative high luminescence quantum efficiency (η). Among these Eu-complexes, the complex Eu (DBM)3HPIP exhibited the lowest quantum efficiency due to the presence of O-H oscillators in this complex, the result indicated different phenanthroline derivatives as second ligands can significantly influence the luminescence properties of Eu-complexes.

Structural Characterization of Complex Bacterial Glycolipids by Fourier Transform Mass Spectrometry

2005 ◽  
Vol 11 (5) ◽  
pp. 535-546 ◽  
Author(s):  
Anna Kondakov ◽  
Buko Lindner
Keyword(s):  
Mass Spectrometry ◽  
Fourier Transform ◽  
Structural Information ◽  
Adaptive Immune System ◽  
Ion Cyclotron Resonance ◽  
Bacterial Membranes ◽  
Multiphoton Dissociation ◽  
The One ◽  
And Function

Bacterial glycolipids are complex amphiphilic molecules which are, on the one hand, of utmost importance for the organization and function of bacterial membranes and which, on the other hand, play a major role in the activation of cells of the innate and adaptive immune system of the host. Already small alterations to their chemical structure may influence the biological activity tremendously. Due to their intrinsic biological heterogeneity [number and type of fatty acids, saccharide structures and substitution with for example, phosphate ( P), 2-aminoethyl-(pyro)phosphate groups ( P-Etn) or 4-amino-4-deoxyarabinose (Ara4N)], separation of the different components are a prerequisite for unequivocal chemical and nuclear magnetic resonance structural analyses. In this contribution, the structural information which can be obtained from heterogenous samples of glycolipids by Fourier transform (FT) ion cyclotron resonance mass spectrometric methods is described. By means of recently analysed complex biological samples, the possibilities of high-resolution electrospray ionization FT-MS are demonstrated. Capillary skimmer dissociation, as well as tandem mass spectrometry (MS/MS) analysis utilizing collision-induced dissociation and infrared multiphoton dissociation, are compared and their advantages in providing structural information of diagnostic importance are discussed.

A ligand field theory-based methodology for the characterization of the Eu 2+ [Xe]4f 6 5d 1 excited states in solid state compounds

2015 ◽  
Vol 622 ◽  
pp. 120-123 ◽  
Author(s):  
Amador García-Fuente ◽  
Fanica Cimpoesu ◽  
Harry Ramanantoanina ◽  
Benjamin Herden ◽  
Claude Daul ◽  
...  
Keyword(s):  
Field Theory ◽  
Solid State ◽  
Excited States ◽  
Ligand Field ◽  
Ligand Field Theory ◽  
The Eu

scholarly journals Investigations of M3Al8O15:Eu3+,Dy3+ (M = Ba, Ca, Mg) phosphors

2016 ◽  
Vol 34 (2) ◽  
pp. 412-417
Author(s):  
Esra Öztürk
Keyword(s):  
Electron Microscopy ◽  
Solid State Reaction Method ◽  
Morphological Characterization ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Three Samples ◽  
Scanning Electron ◽  
The Eu

AbstractIn this work, aluminate type phosphorescence materials were synthesized via the solid state reaction method and the photoluminescence (PL) properties, including excitation and emission bands, were investigated considering the effect of trace amounts of activator (Eu3+) and co-activator (Dy3+). The estimated thermal behavior of the samples at certain temperatures (> 1000 °C) during heat treatment was characterized by differential thermal analysis (DTA) and thermogravimetry (TG). The possible phase formation was characterized by X-ray diffraction (XRD). The morphological characterization of the samples was performed by scanning electron microscopy (SEM). The PL analysis of three samples showed maximum emission bands at around 610 nm, and additionally near 589 nm, 648 nm and 695 nm. The bands were attributed to typical transitions of the Eu3+ ions.

Micro-Scale Flow Simulations and Permeability Estimation of Cleat Networks in Coal

2016 ◽  
Vol 846 ◽  
pp. 42-47
Author(s):  
J. Busse ◽  
S. Galindo Torres ◽  
Alexander Scheuermann ◽  
L. Li ◽  
D. Bringemeier
Keyword(s):  
Gas Flow ◽  
Structural Information ◽  
Porous Matrix ◽  
Groundwater Levels ◽  
Micro Scale ◽  
Wide Range ◽  
Boltzmann Method ◽  
The Impact ◽  
Flow Experiments

Coal mining raises a number of environmental and operational challenges, including the impact of changing groundwater levels and flow patterns on adjacent aquifer and surface water systems. Therefore it is of paramount importance to fully understand the flow of water and gases in the geological system on all scales. Flow in coal seams takes place on a wide range of scales from large faults and fractures to the micro-structure of a porous matrix intersected by a characteristic cleat network. On the micro-scale these cleats provide the principal source of permeability for fluid and gas flow. Description of the behaviour of the flow within the network is challenging due to the variations in number, sizing, orientation, aperture and connectivity at a given site. This paper presents a methodology to simulate flow and investigate the permeability of fractured media. A profound characterization of the geometry of the cleat network in micrometer resolution can be derived by CT-scans. The structural information is fed into a Lattice Boltzmann Method (LBM) based model that allows the implementation of virtual flow experiments. With the application of suitable hydraulic boundary conditions the full permeability tensor can be calculated in 3D.

scholarly journals Synthesis of homoleptic, divalent lanthanide (Sm, Eu) complexes via oxidative transmetallation

2019 ◽  
Vol 48 (45) ◽  
pp. 16869-16872 ◽  
Author(s):  
Thaige P. Gompa ◽  
Ningxin Jiang ◽  
John Bacsa ◽  
Henry S. La Pierre
Keyword(s):  
Europium Complexes ◽  
Divalent Lanthanide ◽  
Eu Complexes

Divalent samarium and europium complexes with bulky 3-coordinate bis(tris-tert-butoxysilyl)amides are synthesized through oxidative transmetallation.

scholarly journals Atomic-level characterization of protein–protein association

2019 ◽  
Vol 116 (10) ◽  
pp. 4244-4249 ◽  
Author(s):  
Albert C. Pan ◽  
Daniel Jacobson ◽  
Konstantin Yatsenko ◽  
Duluxan Sritharan ◽  
Thomas M. Weinreich ◽  
...  
Keyword(s):  
Structural Information ◽  
Protein Complexes ◽  
Md Simulations ◽  
Atomic Level ◽  
Conformational Ensemble ◽  
Native State ◽  
Protein Interfaces ◽  
Study Association ◽  
Functionally Diverse

Despite the biological importance of protein–protein complexes, determining their structures and association mechanisms remains an outstanding challenge. Here, we report the results of atomic-level simulations in which we observed five protein–protein pairs repeatedly associate to, and dissociate from, their experimentally determined native complexes using a molecular dynamics (MD)–based sampling approach that does not make use of any prior structural information about the complexes. To study association mechanisms, we performed additional, conventional MD simulations, in which we observed numerous spontaneous association events. A shared feature of native association for these five structurally and functionally diverse protein systems was that if the proteins made contact far from the native interface, the native state was reached by dissociation and eventual reassociation near the native interface, rather than by extensive interfacial exploration while the proteins remained in contact. At the transition state (the conformational ensemble from which association to the native complex and dissociation are equally likely), the protein–protein interfaces were still highly hydrated, and no more than 20% of native contacts had formed.

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