Probing Variable Amine/Amide Ligation in NiIIN2S2Complexes Using Sulfur K-Edge and Nickel L-Edge X-ray Absorption Spectroscopies: Implications for the Active Site of Nickel Superoxide Dismutase

2008 ◽  
Vol 47 (7) ◽  
pp. 2649-2660 ◽  
Author(s):  
Jason Shearer ◽  
Ahmad Dehestani ◽  
Franklin Abanda
Keyword(s):  
Superoxide Dismutase ◽  
Active Site ◽  
X Ray ◽  
Nickel Superoxide Dismutase ◽  
X Ray Absorption

S K-Edge X-ray Absorption Spectroscopic Investigation of the Ni-Containing Superoxide Dismutase Active Site:  New Structural Insight into the Mechanism

2004 ◽  
Vol 126 (10) ◽  
pp. 3018-3019 ◽  
Author(s):  
Robert K. Szilagyi ◽  
Peter A. Bryngelson ◽  
Michael J. Maroney ◽  
Britt Hedman ◽  
Keith O. Hodgson ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Active Site ◽  
Spectroscopic Investigation ◽  
X Ray ◽  
Structural Insight ◽  
X Ray Absorption ◽  
Insight Into

X-ray absorption edge fine structure spectroscopy of the active site haem of cytochrome c

Nature ◽  
1979 ◽  
Vol 277 (5692) ◽  
pp. 150-151 ◽  
Author(s):  
A. LABHARDT ◽  
C. YUEN
Keyword(s):  
Fine Structure ◽  
Cytochrome C ◽  
Absorption Edge ◽  
Active Site ◽  
X Ray ◽  
X Ray Absorption

The Structure of the Active Site H-Cluster of [FeFe] Hydrogenase from the Green AlgaChlamydomonas reinhardtiiStudied by X-ray Absorption Spectroscopy

Biochemistry ◽  
2009 ◽  
Vol 48 (22) ◽  
pp. 5042-5049 ◽  
Author(s):  
Sven Stripp ◽  
Oliver Sanganas ◽  
Thomas Happe ◽  
Michael Haumann
Keyword(s):  
Absorption Spectroscopy ◽  
Active Site ◽  
X Ray ◽  
X Ray Absorption

Microporous Framework Induced Synthesis of Single-Atom Dispersed Fe-N-C Acidic ORR Catalyst and Its in Situ Reduced Fe-N4 Active Site Identification Revealed by X-ray Absorption Spectroscopy

ACS Catalysis ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 2824-2832 ◽  
Author(s):  
Meiling Xiao ◽  
Jianbing Zhu ◽  
Liang Ma ◽  
Zhao Jin ◽  
Junjie Ge ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Active Site ◽  
Single Atom ◽  
X Ray ◽  
Site Identification ◽  
X Ray Absorption

Electronic Structures of Non-Pt Carbon Alloy Catalysts for Polymer Electrolyte Membrane Fuel Cells Revealed by Synchrotron Radiation Analyses

2011 ◽  
Vol 1318 ◽  
Author(s):  
Masaharu Oshima ◽  
Hideharu Niwa ◽  
Makoto Saito ◽  
Masaki. Kobayashi ◽  
Koji Horiba ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Active Site ◽  
Electronic Structures ◽  
Polymer Electrolyte Membrane ◽  
Pt Catalysts ◽  
X Ray ◽  
Electrolyte Membrane ◽  
X Ray Absorption ◽  
Alloy Catalysts

ABSTRACTThe oxygen reduction reaction (ORR) mechanism of non-Pt catalysts was elucidated by investigating electronic structures of carbon alloy catalysts (CACs) for polymer electrolyte membrane fuel cells (PEMFC). For metal phthalocyanine-based carbon alloy catalysts with 1-2% of nitrogen and less than 0.1% of Co or Fe, photoelectron spectroscopy, X-ray absorption spectroscopy (XAS), and X-ray Absorption Fine Structure (XAFS) have revealed that Co or Fe metal sites are not the ORR active site, whereas the carbon atoms adjacent to graphitic nitrogens at a zigzag edge of graphite may act as the ORR active site, which is in good agreement with first principles calculations. These studies have also revealed that the zigzag edges, detected as a XAS shoulder component, are well evolved for catalysts pyrolyzed at 600°C, which show the maximum ORR activity. Based on these analyses, we have realized significantly improved carbon alloy based ORR performance, up to about 70 % of that with Pt catalysts. Further, to analyze the electronic structure of CACs during operation, we constructed a new in situ soft X-ray emission spectroscopy system with very high energy resolution (ΔE) of 120 meV at 640 eV at the University of Tokyo beamline BL07LSU in SPring-8.

Superoxide dismutase, a study of the electronic properties of the copper and zinc by x-ray absorption spectroscopy

Biochemistry ◽  
1978 ◽  
Vol 17 (10) ◽  
pp. 1842-1846 ◽  
Author(s):  
W. E. Blumberg ◽  
J. Peisach ◽  
P. Eisenberger ◽  
J. A. Fee
Keyword(s):  
Superoxide Dismutase ◽  
Electronic Properties ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Copper And Zinc ◽  
X Ray Absorption

Reactivity of the laccase trinuclear copper active site with dioxygen: an x-ray absorption edge study

1990 ◽  
Vol 112 (6) ◽  
pp. 2243-2249 ◽  
Author(s):  
James L. Cole ◽  
Grace O. Tan ◽  
Edward K. Yang ◽  
Keith O. Hodgson ◽  
Edward I. Solomon
Keyword(s):  
Absorption Edge ◽  
Active Site ◽  
X Ray ◽  
X Ray Absorption

An extended x-ray absorption fine structure investigation of the structure of the active site of lactoperoxidase

Biochemistry ◽  
1993 ◽  
Vol 32 (11) ◽  
pp. 2780-2786 ◽  
Author(s):  
C. S. Chang ◽  
R. Sinclair ◽  
S. Khalid ◽  
I. Yamazaki ◽  
S. Nakamura ◽  
...  
Keyword(s):  
Fine Structure ◽  
Active Site ◽  
Structure Investigation ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption
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