scholarly journals Recent Advance in Structural Studies under Extreme Conditions. Time-Resolved Observation of Solid-State Reaction by Rapid Data Collection and Structure Analysis.

1999 ◽  
Vol 41 (1) ◽  
pp. 82-91 ◽  
Author(s):  
Hidehiro UEKUSA
Keyword(s):  
Solid State ◽  
Data Collection ◽  
Structure Analysis ◽  
Solid State Reaction ◽  
Extreme Conditions ◽  
Structural Studies ◽  
Time Resolved

scholarly journals Time- and Temperature-Dependent Luminescence of Manganese Ions in Ceramic Magnesium Aluminum Spinels

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 420
Author(s):  
Nicholas Khaidukov ◽  
Angela Pirri ◽  
Maria Brekhovskikh ◽  
Guido Toci ◽  
Matteo Vannini ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Broad Band ◽  
Solid State Reaction Method ◽  
Luminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Manganese Ions ◽  
Time Resolved ◽  
Synthesis Conditions ◽  
Magnesium Aluminum Spinel

Samples of magnesium aluminum spinel ceramics doped with manganese ions were prepared by a high-temperature solid-state reaction method; their potential as red-emitting phosphors was analyzed using a time-resolved luminescence spectroscopy technique, from room temperature to 10 K. It was found that in the red spectral range, the luminescence spectra of manganese ions in the MgAl2O4 spinel showed a narrow band peaking at 651 nm due to the emission of Mn4+ and a broader emission band in the region of 675 ÷ 720 nm; the ratio of intensities for these bands depends on the synthesis conditions. By applying a special multi-step annealing procedure, the MgAl2O4:Mn4+ phosphor containing only tetravalent manganese ions, Mn4+, was synthesized. Broad-band far-red emission observed from MgAl2O4:Mn and Mg1.25Al1.75O3.75F0.25:Mn phosphors, prepared by a conventional method of a solid-state reaction, was interpreted as coming from Mn3+ ions.

Time resolved characterization of the solid-state reaction between polycarbonate and primary amine

2018 ◽  
Vol 98 ◽  
pp. 313-320 ◽  
Author(s):  
Cordelia Zimmerer ◽  
Lisa Ziegler ◽  
Gert Heinrich ◽  
Gerald Steiner
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Primary Amine ◽  
Time Resolved

scholarly journals Millisecond mix-and-quench crystallography (MMQX) enables time-resolved studies of PEPCK with remote data collection

IUCrJ ◽  
2021 ◽  
Vol 8 (5) ◽  
Author(s):  
Jonathan A. Clinger ◽  
David W. Moreau ◽  
Matthew J. McLeod ◽  
Todd Holyoak ◽  
Robert E. Thorne
Keyword(s):  
Data Collection ◽  
Protein Dynamics ◽  
Time Resolution ◽  
Phosphoenolpyruvate Carboxykinase ◽  
Structural Studies ◽  
Widespread Application ◽  
Entry Barrier ◽  
Time Resolved ◽  
Oxaloacetic Acid ◽  
Serial Crystallography

Time-resolved crystallography of biomolecules in action has advanced rapidly as methods for serial crystallography have improved, but the large number of crystals and the complex experimental infrastructure that are required remain serious obstacles to its widespread application. Here, millisecond mix-and-quench crystallography (MMQX) has been developed, which yields millisecond time-resolved data using far fewer crystals and routine remote synchrotron data collection. To demonstrate the capabilities of MMQX, the conversion of oxaloacetic acid to phosphoenolpyruvate by phosphoenolpyruvate carboxykinase (PEPCK) is observed with a time resolution of 40 ms. By lowering the entry barrier to time-resolved crystallography, MMQX should enable a broad expansion in structural studies of protein dynamics.

scholarly journals Synthesis and Solid-state Structures of 1,3- and 1,4-Bis(diethylgallyl) benzene

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1375-1380
Author(s):  
Joseph Izundu ◽  
Peter Jutzi ◽  
Beate Neumann ◽  
Henning Sielemann ◽  
Hans-Georg Stammler
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Structural Studies ◽  
X Ray ◽  
Coordination Behavior ◽  
Redistribution Reactions ◽  
Solid State Structures

The compounds 1,3-bis(diethylgallyl)benzene (3) and 1,4- bis(diethylgallyl)benzene (6) were prepared by reaction of the corresponding chloromercuriobenzenes with an excess of triethylgallium by applying pressure and higher temperatures. These compounds very easily undergo redistribution reactions in solution and in the solid state. Extremely air-sensitive crystals suitable for an X-ray crystal structure analysis were obtained from triethylgallium as solvent. The structural studies revealed the presence of tetra-coordinated carbon and gallium atoms in symmetric aryl-diethylgallyl bridging units. The coordination behavior of 3 and 6 in the solid state is quite different from that of the corresponding methyl-substituted compounds

Synthesis and structural characterization of luminescent materials. The elpasolite Cs2NaTbCl6

2002 ◽  
Vol 17 (1) ◽  
pp. 10-12 ◽  
Author(s):  
V. Poblete ◽  
G. Navarro ◽  
V. Martin ◽  
M. Alvarez
Keyword(s):  
Thermal Analysis ◽  
Solid State ◽  
Powder Diffraction ◽  
Structural Characterization ◽  
Solid State Reaction ◽  
Luminescent Materials ◽  
Controlled Atmosphere ◽  
Structural Studies ◽  
Refinement Method

In this work we report the synthesis and structural characterization of the elpasolite Cs2NaTbCl6, belonging to the space group Fm3m. The synthesis is by solid state reaction, in controlled atmosphere. By means of thermal analysis (DTA/TGA), the best crystallization temperatures were obtained: 772.2 °C for 2 hours. Structural studies are carried out by means of DRX-powder diffraction and application of the Rietveld profiles refinement method, for the 32 diffraction lines analyzed. The following crystallographic parameters are obtained: a0=10.7636 (Å), Z=4, M=660.44, V=1247.0 (Å)3, Dx=3.519, and Dexp=3.52±0.01.

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