Exafs Analysis of Ionomers

1986 ◽  
Vol 79 ◽  
Author(s):  
Y. S. Ding ◽  
H. K. Pan ◽  
R. A. Régister ◽  
S. L. Cooper
Keyword(s):  
Fine Structure ◽  
Exafs Spectroscopy ◽  
Zinc Cation ◽  
X Ray ◽  
Exafs Analysis ◽  
Absorption Fine ◽  
Carboxylate Groups ◽  
X Ray Absorption ◽  
Oxygen Atoms

AbstractExtended x-ray absorption fine structure (EXAFS) spectroscopy has beensuccessfully applied to the analysis of the ionic domain microstructure inzinc and rubidium neutralized ionomers. In dehydrated zinc neutralizedionomers, the zinc cation was found to be tetrahedrally coordinated to oxygenatoms. For ionomers with hydrocarbon backbones, these oxygen atoms mayoriginate from the sulfonate or carboxylate groups. For ionomers withperfluorinated backbones, some of the oxygen atoms may be ascribed to watercoordination as well. In fully hydrated zinc neutralized ionomers, thezinc cation exists as Zn( H2O)62+. In contrast, the fully hydrated monovalentrubidium neutralized ionomers exhibited a highly disordered environmentabout the cation.

scholarly journals Solvent-dependent nuclearity, geometry and catalytic activity of [(SPhos)Pd(Ph)Cl]2

2017 ◽  
Vol 46 (22) ◽  
pp. 7223-7231 ◽  
Author(s):  
John B. Brazier ◽  
Mark A. Newton ◽  
Elena M. Barreiro ◽  
Luis A. Adrio ◽  
Leticia Naya ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Catalytic Activity ◽  
Fine Structure ◽  
Nmr Spectroscopy ◽  
Dft Calculations ◽  
Palladium Complex ◽  
Exafs Spectroscopy ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

The nuclearity and structures of the palladium complex [(SPhos)Pd(Ph)Cl]2 in the solid and solution states are revisited using a combination of Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, NMR spectroscopy, mass spectrometry, DFT calculations and trapping experiments.

Structural investigation of supported Cun clusters under vacuum and ambient air conditions using EXAFS spectroscopy

2016 ◽  
Vol 6 (18) ◽  
pp. 6942-6952 ◽  
Author(s):  
S. Peredkov ◽  
S. Peters ◽  
M. Al-Hada ◽  
A. Erko ◽  
M. Neeb ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structural Analysis ◽  
Structural Investigation ◽  
Ambient Air ◽  
Exafs Spectroscopy ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

Structural analysis of deposited nanoclusters using extended X-ray absorption fine structure (EXAFS) spectroscopy.

Noninvasive Quantitative Chromium(III) Speciation in Neat Solid Mixtures by Extended X-ray Absorption Fine Structure Spectroscopy

1995 ◽  
Vol 49 (6) ◽  
pp. 808-812 ◽  
Author(s):  
M. M. Lamoureux ◽  
J. C. Hutton ◽  
D. L. Styris ◽  
R. L. Gordon
Keyword(s):  
Fine Structure ◽  
Coordination Sphere ◽  
Correlation Coefficients ◽  
Exafs Spectroscopy ◽  
Simple Correlation ◽  
X Ray ◽  
Absorption Fine ◽  
K 12 ◽  
Optimized Conditions ◽  
X Ray Absorption

A procedure that uses extended X-ray absorption fine structure (EXAFS) spectroscopy for quantitative chromium(III) speciation in neat solid mixtures is described. The procedure uses the full, filtered EXAFS, e.g., 4 ≤ k ≤ 12 Å−1, rather than the smaller k-range associated with a single coordination sphere. Concentration is determined by a simple correlation of full, filtered EXAFS of standards with full, filtered EXAFS of mixtures. Under optimized conditions, calibration curves for mixtures of Cr2O3 and Cr(NO3)3·9H2O have slopes of 1.002, respective intercepts of −0.7% and 0.5%, and correlation coefficients of 0.9991. Fluorescence EXAFS from mixtures must be compared to fluorescence EXAFS from standards, and the matrices and thicknesses of standards and mixtures must be closely matched. Transmission EXAFS of standards must be obtained to correct for self-absorption effects.

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