Probing the electronic structure of a copper(ii) complex by CW- and pulse-EPR spectroscopy

2017 ◽  
Vol 46 (26) ◽  
pp. 8458-8475 ◽  
Author(s):  
Zoi G. Lada ◽  
Yiannis Sanakis ◽  
Catherine P. Raptopoulou ◽  
Vassilis Psycharis ◽  
Spyros P. Perlepes ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Epr Spectroscopy ◽  
Pulse Epr

The electronic structure of a mononuclear octahedral copper(ii) complex has been studied using CW EPR spectroscopy and other advanced methods including Davies ENDOR and HYSCORE (1H and 13C) spectroscopy.

EPR Spectroscopy Elucidates the Electronic Structure of [FeV(O)(TAML)] Complexes

2021 ◽  
Author(s):  
Yujeong Kim ◽  
Jin Kim ◽  
Linh. K. Nguyen ◽  
Yong-Min Lee ◽  
Wonwoo Nam ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Epr Spectroscopy ◽  
Macrocyclic Ligands ◽  
Spin Hamiltonian ◽  
Pulse Epr ◽  
Hamiltonian Parameters

Multifrequency, multitechnique pulse EPR spectroscopy was employed to unravel the spin Hamiltonian parameters of 17O in the [FeV=O] moiety with two different tetraamido macrocyclic ligands (TAMLs), [FeV(O)(TAML-1)]– (1, H4(TAML-1) =...

scholarly journals Characterizing SPASM/twitch Domain-Containing Radical SAM Enzymes by EPR Spectroscopy

2021 ◽  
Author(s):  
Aidin R. Balo ◽  
Lizhi Tao ◽  
R. David Britt
Keyword(s):  
Epr Spectroscopy ◽  
Continuous Wave ◽  
Spectroscopic Studies ◽  
Paramagnetic Species ◽  
Paramagnetic Resonance ◽  
Iron Sulfur Cluster ◽  
Radical Sam Enzymes ◽  
Iron Sulfur ◽  
Pulse Epr ◽  
Multiple Domains

AbstractOwing to their importance, diversity and abundance of generated paramagnetic species, radical S-adenosylmethionine (rSAM) enzymes have become popular targets for electron paramagnetic resonance (EPR) spectroscopic studies. In contrast to prototypic single-domain and thus single-[4Fe–4S]-containing rSAM enzymes, there is a large subfamily of rSAM enzymes with multiple domains and one or two additional iron–sulfur cluster(s) called the SPASM/twitch domain-containing rSAM enzymes. EPR spectroscopy is a powerful tool that allows for the observation of the iron–sulfur clusters as well as potentially trappable paramagnetic reaction intermediates. Here, we review continuous-wave and pulse EPR spectroscopic studies of SPASM/twitch domain-containing rSAM enzymes. Among these enzymes, we will review in greater depth four well-studied enzymes, BtrN, MoaA, PqqE, and SuiB. Towards establishing a functional consensus of the additional architecture in these enzymes, we describe the commonalities between these enzymes as observed by EPR spectroscopy.

scholarly journals EPR Spectroscopy Study of the Radical Cation Cluster (η⁵-C₅H₅)(CO)₅ReFePt(μ₃-C=CHPh)(η²-Ph₂P(CH₂)₂PPh₂)

2019 ◽  
pp. 573-579
Author(s):  
Nikolay G. Maksimov ◽  
Victor V. Verpekin ◽  
Dmitry V. Zimonin ◽  
Galina V. Burmakina ◽  
Oleg S. Chudin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Low Temperature ◽  
Radical Cation ◽  
Unpaired Electron ◽  
Iron Atom ◽  
Epr Spectroscopy ◽  
Binuclear Complex ◽  
Chemical Oxidation ◽  
Spectroscopy Study ◽  
Model Spectrum

The chemical oxidation of the cluster CpReFePt(μ3-C=CHPh)(CO)5(dppe) (Cp = η5-C5H5, dppe = η2- Ph2P(CH2)2PPh2) resulted in a radical cation [CpReFePt(μ3-C=CHPh)(CO)5(dppe)]+• that is sufficiently stable only at low temperature. An electronic structure of the radical cation was studied by EPR and following parameters were obtained by comparison of the experimental and model spectrum: gx = 2.070 gy = 2.0295 gz = 1.997; Ax(31P) = 17 Ay(31P) = 49 Az(31P) = 35 (Gs);Ax(195Pt) = 62 Ay(195Pt) = 45 Az(195Pt) = 105 (Gs). An unpaired electron is seen to be mainly concentrated on the iron atom (85-90%) and partially on the platinum atom (10-15%). Further transformation of the radical cation led to the formation of the binuclear complex Cp(CO)2RePt(μ-C=CHPh)(dppe) and the Fe-carbonyl fragment

Characterization of the electronic structure of defect in quartz by pulsed EPR spectroscopy

2012 ◽  
Vol 376 (32) ◽  
pp. 2195-2199 ◽  
Author(s):  
Pengbo Feng ◽  
Ya Wang ◽  
Xing Rong ◽  
Ji-Hu Su ◽  
Chenyong Ju ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Epr Spectroscopy ◽  
Pulsed Epr

scholarly journals High-resolution measurement of long-range distances in RNA: pulse EPR spectroscopy with TEMPO-labeled nucleotides

2016 ◽  
Vol 7 (5) ◽  
pp. 3172-3180 ◽  
Author(s):  
Karin Halbmair ◽  
Jan Seikowski ◽  
Igor Tkach ◽  
Claudia Höbartner ◽  
Deniz Sezer ◽  
...  
Keyword(s):  
High Resolution ◽  
Long Range ◽  
Epr Spectroscopy ◽  
Base Pair ◽  
Distance Measurements ◽  
Model Free ◽  
High Resolution Measurement ◽  
Resolution Measurement ◽  
Pair Separation ◽  
Pulse Epr

Distance measurements in RNAs by pulse EPR with TEMPO-labeled nucleotides allow for model free conversion of distances into base-pair separation.

Direct EPR detection of atomic nitrogen in an atmospheric nitrogen plasma jet

2020 ◽  
Vol 22 (7) ◽  
pp. 3875-3882
Author(s):  
Arpad Mihai Rostas ◽  
Loic Ledernez ◽  
Lisa Dietel ◽  
Lorenz Heidinger ◽  
Michael Bergmann ◽  
...  
Keyword(s):  
Real Time ◽  
Epr Spectroscopy ◽  
Relaxation Times ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Atmospheric Nitrogen ◽  
Atomic Nitrogen ◽  
Pulse Epr

A nitrogen plasma generated by a self-designed microplasma device was analyzed by cw and pulse EPR spectroscopy in real time. Nitrogen atoms were detected and characterized in terms of spectral widths, relaxation times and actual concentrations.

Control over Fe3+ speciation in colloidal ZnO nanocrystals

2015 ◽  
Vol 3 (17) ◽  
pp. 4352-4358 ◽  
Author(s):  
Dongming Zhou ◽  
Kevin R. Kittilstved
Keyword(s):  
Electronic Structure ◽  
Epr Spectroscopy ◽  
Ground State ◽  
Zno Nanocrystals ◽  
Nanocrystal Growth

The ground state electronic structure of Fe3+ dopants in colloidal ZnO nanocrystals is studied by EPR spectroscopy and reveals multiple Fe3+ coordination environments during nanocrystal growth.

scholarly journals The Electronic Structure of the Cys-Tyr•Free Radical in Galactose Oxidase Determined by EPR Spectroscopy†

Biochemistry ◽  
2008 ◽  
Vol 47 (25) ◽  
pp. 6637-6649 ◽  
Author(s):  
Yuk-Ki Lee ◽  
Mei M. Whittaker ◽  
James W. Whittaker
Keyword(s):  
Electronic Structure ◽  
Free Radical ◽  
Epr Spectroscopy ◽  
Galactose Oxidase

scholarly journals Ligation of D1-His332 and D1-Asp170 to the Manganese Cluster of Photosystem II fromSynechocystisAssessed by Multifrequency Pulse EPR Spectroscopy†

Biochemistry ◽  
2011 ◽  
Vol 50 (34) ◽  
pp. 7390-7404 ◽  
Author(s):  
Troy A. Stich ◽  
Gregory J. Yeagle ◽  
Rachel J. Service ◽  
Richard J. Debus ◽  
R. David Britt
Keyword(s):  
Photosystem Ii ◽  
Epr Spectroscopy ◽  
Manganese Cluster ◽  
Pulse Epr

A Pulse EPR and ENDOR Investigation of the Electronic Structure of a σ-Carbon-Bonded Cobalt(IV) Corrole

2002 ◽  
Vol 106 (10) ◽  
pp. 2801-2811 ◽  
Author(s):  
Jeffrey Harmer ◽  
Sabine Van Doorslaer ◽  
Igor Gromov ◽  
Martin Bröring ◽  
Gunnar Jeschke ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Pulse Epr
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