scholarly journals Scrutinizing metal–ligand covalency and redox non-innocence via nitrogen K-edge X-ray absorption spectroscopy

2019 ◽  
Vol 10 (19) ◽  
pp. 5044-5055 ◽  
Author(s):  
James T. Lukens ◽  
Ida M. DiMucci ◽  
Takashi Kurogi ◽  
Daniel J. Mindiola ◽  
Kyle M. Lancaster
Keyword(s):  
Transition Metals ◽  
Absorption Spectroscopy ◽  
Coordination Complexes ◽  
X Ray ◽  
Inner Sphere ◽  
Aminyl Radical ◽  
X Ray Absorption ◽  
Radical Ligand ◽  
Metal Ligand

A series of nitrogen K-edge XAS data obtained for coordination complexes of diverse transition metals is used to calibrate computational pre-edge peak energies and to afford estimates of metal–ligand covalencies. The approach is extended to probe an inner-sphere aminyl radical ligand.

Identification of Transition Metal Sites in Fused SiO2 by X-Ray Absorption Spectroscopy

1985 ◽  
Vol 61 ◽  
Author(s):  
Farrel W. Lytle ◽  
Robert B. Greegor
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Absorption Spectroscopy ◽  
Optical Data ◽  
Site Symmetry ◽  
X Ray ◽  
Hydrolysis Method ◽  
Fused Quartz ◽  
X Ray Absorption ◽  
Good Agreement

ABSTRACTX-ray absorption spectroscopy is used to determine valence and site symmetry for all the 3d transition metals in fused quartz prepared by the flame hydrolysis method. The results are compared with optical data on the same samples with generally good agreement.

scholarly journals Trends in reactivity of electrodeposited 3d transition metals on gold revealed byoperandosoft x-ray absorption spectroscopy during water splitting

2016 ◽  
Vol 50 (2) ◽  
pp. 024002 ◽  
Author(s):  
J J Velasco-Vélez ◽  
Travis E Jones ◽  
Verena Pfeifer ◽  
Chung-Li Dong ◽  
Yu-Xun Chen ◽  
...  
Keyword(s):  
Transition Metals ◽  
Water Splitting ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Absorption

Study of the L2,3 edges of 3d transition metals by X-ray absorption spectroscopy

2008 ◽  
Vol 517 (2) ◽  
pp. 1000-1004 ◽  
Author(s):  
G. Akgül ◽  
F. Aksoy ◽  
A. Bozduman ◽  
O.M. Ozkendir ◽  
Y. Ufuktepe ◽  
...  
Keyword(s):  
Transition Metals ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Absorption

Probing covalency in halogen bonds through donor K-edge X-ray absorption spectroscopy: polyhalides as coordination complexes

2017 ◽  
Vol 203 ◽  
pp. 79-91 ◽  
Author(s):  
Chantal L. Mustoe ◽  
Mathusan Gunabalasingam ◽  
Darren Yu ◽  
Brian O. Patrick ◽  
Pierre Kennepohl
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Absorption Spectroscopy ◽  
Coordination Complexes ◽  
Halogen Bonds ◽  
X Ray ◽  
Secondary Interactions ◽  
Coordination Bonds ◽  
X Ray Absorption ◽  
Degree Of Charge Transfer

The properties of halogen bonds (XBs) in solid-state I2X−and I4X−materials (where X = Cl, Br) are explored using donor K-edge X-ray absorption spectroscopy (XAS) to experimentally determine the degree of charge transfer in such XB interactions. The degree of covalency in these bonds is substantial, even in cases where significantly weaker secondary interactions are observed. These data, in concert with previous work in this area, suggests that certain halogen bonds have covalent contributions to bonding that are similar to, and even exceed, those observed in transition metal coordinate bonds. For this reason, we suggest that XB interactions of this type be denoted in a similar way to coordination bonds (X → Y) as opposed to using a representation that is the same as for significantly less covalent hydrogen bonds (X⋯Y).

Actinide uptake by transferrin and ferritin metalloproteins

2005 ◽  
Vol 93 (11) ◽  
Author(s):  
Christophe Den Auwer ◽  
I. Llorens ◽  
Philippe Moisy ◽  
C. Vidaud ◽  
F. Goudard ◽  
...  
Keyword(s):  
Transition Metals ◽  
Protein Binding ◽  
Binding Site ◽  
Absorption Spectroscopy ◽  
Metal Cation ◽  
Iron Transport ◽  
Intramolecular Interactions ◽  
X Ray ◽  
And Storage ◽  
X Ray Absorption

SummaryIn order to better understand the mechanisms of actinide uptake by specific biomolecules, it is essential to explore the intramolecular interactions between the cation and the protein binding site. Although this has long been done for widely investigated transition metals, very few studies have been devoted to complexation mechanisms of actinides by active chelation sites of metalloproteins. In this field, X-ray absorption spectroscopy has been extensively used as a structural and electronic metal cation probe. The two examples that are presented here are related to two metalloproteins in charge of iron transport and storage in eukaryote cells: transferrin and ferritin. U(VI)O

scholarly journals Resolving the Ultrafast Changes of Chemically Inequivalent Metal–Ligand Bonds in Photoexcited Molecular Complexes with Transient X-ray Absorption Spectroscopy

ACS Omega ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 6375-6381 ◽  
Author(s):  
Jianxin Zhang ◽  
Xiaoyi Zhang ◽  
Karina Suarez-Alcantara ◽  
Guy Jennings ◽  
Charles A. Kurtz ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Molecular Complexes ◽  
X Ray ◽  
X Ray Absorption ◽  
Metal Ligand
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