scholarly journals Variation of Quadrupole Splitting in Modified Oxyhemoglobin: A Mössbauer Effect Study

2000 ◽  
Vol 55 (1-2) ◽  
pp. 193-198 ◽  
Author(s):  
M. I. Oshtrakh ◽  
O. B. Milder ◽  
V. A. Semionkin ◽  
A. L. Berkovsky ◽  
M. A. Azhigirova ◽  
...  
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Effect Study ◽  
Heme Iron ◽  
Mossbauer Effect ◽  
Frozen Solution ◽  
Mossbauer Spectra ◽  
Human Adult ◽  
Adult Hemoglobin ◽  
Α And Β Subunits

Human adult hemoglobin modified by both pyridoxal-5'-phosphate and glutaraldehyde in the oxy-form was studied by Mössbauer spectroscopy. Mössbauer spectra were measured at 87 and 295 K (hemoglobin in lyophilized form) and at 87 K (hemoglobin in frozen solution). The values of the quadrupole splitting for modified oxyhemoglobin were found to be lower then those of oxyhemoglobin without modifications in lyophilized form and frozen solution, respectively. The Mössbauer spectra of modified oxyhemoglobin were also analyzed in terms of the heme iron inequivalence in α-and β-subunits of the tetramer. Differences of the tendencies of temperature dependencies of quadrupole splitting for modified and non-modified oxyhemoglobin in lyophilized form were shown.

Quadrupole Splitting and Paramagnetic Iron Core Structure in Iron-Dextran Complexes: A Mössbauer Effect Study

2000 ◽  
Vol 55 (1-2) ◽  
pp. 186-192
Author(s):  
M. I. Oshtrakh ◽  
V. A. Semionkin ◽  
O. B. Milder ◽  
A. B. Livshits ◽  
A. A. Kozlov
Keyword(s):  
Quadrupole Splitting ◽  
Effect Study ◽  
Core Structure ◽  
Iron Core ◽  
Iron Dextran ◽  
Mossbauer Effect ◽  
Quadrupole Split ◽  
Frozen Solution ◽  
Frozen Solutions ◽  
Forms Of Iron

The pharmaceutical^ important iron-dextran complexes (ferritin models) were studied by Mössbauer spectroscopy in frozen solution at 87 K and in lyophilized form at 297 and 87 K. The quadrupole splittings of the lyophilized forms of iron-dextran complexes measured at 297 and 87 K were slightly different. The quadrupole splittings of several complexes in lyophilized form and frozen solutions measured at 87 K were also different. Slight differences in the quadrupole split-ting were found for various iron-dextran complexes. Mössbauer spectra of iron-dextran complexes were better fitted using two quadrupole split doublets. Slight differences in the corresponding quadrupole splittings and doublet ratios were observed for various complexes.

The Features of Mössbauer Spectra of Hemoglobin in Relation to the Quadrupole Splitting and Heme Iron Stereochemistry

1998 ◽  
Vol 53 (6-7) ◽  
pp. 608-614 ◽  
Author(s):  
M. I. Oshtrakh
Keyword(s):  
Quadrupole Splitting ◽  
Line Width ◽  
Line Shape ◽  
Mössbauer Spectra ◽  
Heme Iron ◽  
Mossbauer Spectra ◽  
Lorentzian Line ◽  
Hemoglobin Tetramer ◽  
Lorentzian Line Shape ◽  
Heme Iron Stereochemistry

Abstract Mössbauer spectra of various human ferrous hemoglobins in different ligand forms demonstrated some features such as non-Lorentzian line shape for oxyhemoglobins, narrower line width for carbonmonoxide, and variations of quadrupole splitting for different hemoglobins. These features were considered in relation to the variations of quadrupole splitting and heme iron stereochemistry in different hemoglobins as well as in non-equivalent subunits of hemoglobin tetramer.

Some remarks on a recent Mössbauer effect study of the β-phase iron germanide

1976 ◽  
Vol 54 (18) ◽  
pp. 1850-1853 ◽  
Author(s):  
G. A. Fatséas
Keyword(s):  
Computer Analysis ◽  
Binomial Distribution ◽  
Mössbauer Spectra ◽  
Effect Study ◽  
Iron Site ◽  
Mossbauer Effect ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Β Phase ◽  
Line Iron

A Mössbauer study of iron germanide was published recently in this journal (Daniels, Moore, and Panda). The authors reported that they reproduced, by computer analysis, their Mössbauer spectra in terms of three six-line iron sites, rejecting our earlier results of several FeI and FeII sites identified from a model of statistical (binomial) distribution of vacancies on the iron-site positions (Fatséas, Dormann, and Brossard). We would like, in this paper, to make some remarks and also to present some of our unpublished results for eventual future discussions.

The Mössbauer spectra of hydroxycarbonate green rusts

Clay Minerals ◽  
1984 ◽  
Vol 19 (1) ◽  
pp. 77-83 ◽  
Author(s):  
E. Murad ◽  
R. M. Taylor
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Paramagnetic State ◽  
Type Structure ◽  
Natural Systems ◽  
Mossbauer Spectra ◽  
Green Rusts ◽  
Cation Arrangement ◽  
Excess Fe

AbstractMössbauer spectra of Fe2+Fe3+ and Fe2+Al hydroxycarbonates taken in the paramagnetic state were fitted using two Fe2+ and Fe3+ doublets each. These spectra can be interpreted in terms of an ordered cation arrangement in the pyroaurite-type structure. The inner Fe2+ doublet seems to be the outcome of excess Fe3+ in the samples studied. The outer Fe2+ doublet (quadrupole splitting ∼2·8 mm s−1, FWHM = 0·26 mm s−1) is relatively well-defined and can, together with the fact that this doublet disappears on oxidation, possibly serve to identify these compounds in natural systems.

119Sn Mössbauer spectroscopy of solvothermally synthesized fluorides ASnF3 (A = Na, K, Rb, Cs)

2015 ◽  
Vol 70 (10) ◽  
pp. 765-767
Author(s):  
Birgit Gerke ◽  
Thanh Thao Tran ◽  
Rainer Pöttgen ◽  
P. Shiv Halasyamani
Keyword(s):  
Mössbauer Spectroscopy ◽  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Mossbauer Spectroscopy ◽  
Lone Pair ◽  
Electric Quadrupole ◽  
119Sn Mössbauer Spectroscopy ◽  
Solvothermal Route ◽  
Mossbauer Spectra ◽  
Divalent Tin

AbstractThe complex Sn(II) fluorides ASnF3 (A = Na, K, Rb, Cs) were synthesized from the alkali fluorides and SnF2 in methanol through a solvothermal route. Their 119Sn Mössbauer spectra manifest divalent tin. The isomer shifts range from 3.09 to 2.94 mm s–1. The pronounced lone-pair character at the Sn(II) centres is expressed by strong electric quadrupole splitting (1.91–1.95 mm s–1). The two, respectively four crystallographically independent tin sites in NaSnF3, KSnF3 and RbSnF3 could not be resolved in the 119Sn spectra.

Hyperfine quadrupole splitting and mössbauer spectra for an orbital doublet

1973 ◽  
Vol 59 (2) ◽  
pp. 707-714 ◽  
Author(s):  
I. B. Bersuker ◽  
S. A. Borshch ◽  
I. Ya. Ogurtsov
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Mossbauer Spectra

Study of the interaction of Pu(IV) and Np(IV,V,VI) with Fe hydroxides to predict the behavior of actinides in environmental media

2001 ◽  
Vol 89 (2) ◽  
Author(s):  
M. S. Grigoriev ◽  
A. M. Fedosseev ◽  
A.V. Gelis ◽  
N.A. Budantseva ◽  
V.P. Shilov ◽  
...  
Keyword(s):  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Mossbauer Effect ◽  
Environmental Media ◽  
Mossbauer Spectra ◽  
Effect Method

A Mössbauer effect method was used to study the formation of mixed hydroxides in the alkaline coprecipitation of Pu(IV) or Np(IV) with Fe(III). The Mössbauer spectra of mixed

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