The 125Te Mössbauer Absorption Spectra of the Thiourea, Ethylenethiourea, and Tetramethylthiourea Derivatives of Tellurium(II) and Tellurium(IV)

1972 ◽  
Vol 50 (22) ◽  
pp. 3677-3685 ◽  
Author(s):  
B. M. Cheyne ◽  
C. H. W. Jones ◽  
P. Vasudev
Keyword(s):  
Isomer Shift ◽  
Quadrupole Splitting ◽  
Absorption Spectra ◽  
Mössbauer Spectra ◽  
Mossbauer Spectrum ◽  
Mössbauer Spectrum ◽  
Mossbauer Spectra ◽  
Derivatives Of ◽  
Bonding Scheme

The 125Te Mössbauer spectra of a number of Te(II) and Te(IV) complexes of thiourea and related derivatives have been measured. The isomer shifts and quadrupole splittings for several of the compounds are interpreted in terms of a bonding scheme utilizing three-center, two-electron bonds in which the tellurium 5p orbitals participate. The 129I Mössbauer spectrum of trans-TeEtu2129I2 is reported and the isomer shift and quadrupole splitting are shown to be consistent with the proposal that the iodine uses only a 5p orbital in bonding to the tellurium.

The 125Te Mössbauer Absorption Spectra of Tellurium Complexes with Sulfur-Containing Ligands

1975 ◽  
Vol 53 (13) ◽  
pp. 1855-1860 ◽  
Author(s):  
Robert Michael Cheyne ◽  
Colin Henry Wilson Jones ◽  
Steinar Husebye
Keyword(s):  
Crystal Structure ◽  
Absorption Spectra ◽  
Structure Data ◽  
Mössbauer Spectra ◽  
Crystal Structure Data ◽  
X Ray ◽  
Mossbauer Spectra ◽  
Distorted Octahedral ◽  
Sulfur Containing ◽  
Bonding Scheme

The 125Te Mössbauer spectra of a number of Te(II) and Te(IV) complexes with sulfur-containing ligands have been measured. The Te(II) compounds exhibit large quadrupole splittings of 12.4 to 15.2 mm s−1 and isomer shifts (125I/Cu) of + 0.33 to + 0.91 mm s−1. These data are interpreted as evidence for the incorporation of some 5s character in the bonding scheme for several of the compounds, consistent with the interpretation of X-ray crystal structure data. For the Te(IV) compounds 6, 7, and 8 coordinate molecules have been studied containing tellurium in distorted octahedral, pentagonal bipyramidal, and dodecahedral coordination.

Complexes of phthalocyaninatoiron(II) with diazoles

2001 ◽  
Vol 05 (06) ◽  
pp. 545-547 ◽  
Author(s):  
R. ETTORRE ◽  
D. MARTON ◽  
U. RUSSO ◽  
P. ZANONATO
Keyword(s):  
Isomer Shift ◽  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Mossbauer Spectra

The complexes of formula [ Fe ( Pc )( diazole )2]·n H 2 O ( Pc = phthalocyaninato dianion ; diazole = pyrazole , 3(5)-methylpyrazole, indazole and 1-phenylimidazole) have been prepared and characterized. The Mössbauer spectra of the bisadducts of [ Fe ( Pc )] with diazoles show values of isomer shift close to those of the corresponding complexes with pyridines, but somewhat smaller values of quadrupole splitting.

The influence of crystallinity on the Mössbauer spectrum of lepidocrocite

1984 ◽  
Vol 48 (349) ◽  
pp. 507-511 ◽  
Author(s):  
Enver Murad ◽  
Udo Schwertmann
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Magnetic Ordering ◽  
Particle Morphology ◽  
Magnetic Hyperfine ◽  
Mossbauer Spectrum ◽  
Neel Temperature ◽  
Hyperfine Fields ◽  
Néel Temperature ◽  
Mossbauer Spectra

AbstractParticle morphology can result in very pronounced effects of crystallinity on the Mössbauer spectra of lepidocrocite. Such effects can noticeably increase the quadrupole splitting of poorly crystallized paramagnetic lepidocrocites, making it necessary to fit two doublets of different quadrupole splittings to Mössbauer spectra of such samples, and may lower the onset of magnetic ordering from the bulk Néel temperature of 77 ±1 K to about 50 K.At 4.2 K, distributions of magnetic hyperfine fields with a limiting upper field of 460 kOe are observed. The contributions of lower fields to such distributions increase with decreasing crystallinity, producing asymmetrically broadened resonant lines.

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
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