A [3Fe–3S]3+ cluster with exclusively μ-sulfide donors

2016 ◽  
Vol 52 (6) ◽  
pp. 1174-1177 ◽  
Author(s):  
Yousoon Lee ◽  
Ie-Rang Jeon ◽  
Khalil A. Abboud ◽  
Ricardo García-Serres ◽  
Jason Shearer ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Ground State ◽  
Hyperfine Coupling ◽  
Mossbauer Spectroscopy ◽  
Variable Temperature ◽  
Coupling Constants ◽  
Hyperfine Coupling Constants ◽  
Mößbauer Spectroscopy ◽  
Pyramidal Geometry ◽  
Anisotropic Hyperfine

A [3Fe–3(μ-S)]3+ cluster is reported in which each ferric center has a distorted trigonal pyramidal geometry, with an S = 1/2 ground state for the cluster and unusually anisotropic hyperfine coupling constants as determined by variable temperature magnetometry and Mössbauer spectroscopy.

Calculation of hyperfine coupling constants of the CN and CP ground state radicals

1993 ◽  
Vol 98 (9) ◽  
pp. 7012-7019 ◽  
Author(s):  
Berta Fernández ◽  
Poul Jo/rgensen ◽  
Jack Simons
Keyword(s):  
Ground State ◽  
Hyperfine Coupling ◽  
Coupling Constants ◽  
Hyperfine Coupling Constants

Nanostructural Studies by MÖssbauer Spectroscopy

1994 ◽  
Vol 332 ◽  
Author(s):  
Georgia C. Papaefthymiou
Keyword(s):  
Mössbauer Spectroscopy ◽  
Spin Structure ◽  
Mossbauer Spectroscopy ◽  
Variable Temperature ◽  
Structural Parameters ◽  
Nanoscale Systems ◽  
Mößbauer Spectroscopy ◽  
Dynamical Spin ◽  
Microscopic Picture

ABSTRACTApplication of 57Fe MÖssbauer spectroscopy to the determination of magnetic structural parameters relevant to nanostructural studies is discussed. Variable temperature and applied magnetic field strength investigations are considered in order to illustrate the power of the technique in rendering a microscopic picture of the internal spin structure and dynamical spin relaxation phenomena associated with nanoscale systems. Examples from biology and chemistry, where iron aggregates of nanometer dimensions are encountered, are presented.

Iron phases identified in bentonite from the Lieskovec deposit (Slovakia) by variable-temperature Mössbauer spectroscopy

Clay Minerals ◽  
2008 ◽  
Vol 43 (1) ◽  
pp. 107-115 ◽  
Author(s):  
P. Komadel ◽  
A. S. Anastácio ◽  
S. Andrejkovičová ◽  
J. W. Stucki
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Variable Temperature ◽  
Fine Fraction ◽  
Morin Transition ◽  
Hyperfine Parameters ◽  
Mößbauer Spectroscopy ◽  
Fe Content ◽  
Wet Chemical ◽  
Low Charge

AbstractThe clay-mineral fraction of samples from a bentonite deposit in the Zvolenská kotlina Basin (Slovakia), formed by the alteration of andesitic pyroclastics, was dominated by Fe-bearing montmorillonite of relatively low charge. The total Fe content of the samples ranged from 3.58 to 5.81 wt.% Fe. Variable-temperature Mössbauer spectroscopy revealed that structural Fe(III) in smectite accounts for 70–90% of the total Fe in the unfractionated samples. No structural Fe(II) was observed by Mössbauer spectroscopy, but a small amount was detected by wet chemical analysis. The remainder of the Fe is present in oxide and/or oxyhydroxide phases dominated by poorly ordered goethite and hematite. The hyperfine parameters of the Mössbauer spectra for the raw bentonite are consistent with structural Fe(III) in an aluminosilicate phase mixed with varying quantities of hematite, goethite and possibly maghemite. Except in the fine fraction of sample L28, the hematite failed to undergo the Morin transition, as shown by the negative values for quadrupole splitting at 298 K and 6 K.

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