A Mössbauer study of organotellurium compounds. Part II. Halides, acetates, and benzoates

1976 ◽  
Vol 54 (23) ◽  
pp. 3737-3742 ◽  
Author(s):  
Frank J. Berry ◽  
Colin H. W. Jones
Keyword(s):  
The Other ◽  
Mössbauer Study ◽  
Mössbauer Data ◽  
Organotellurium Compounds

125Te Mössbauer data, measured at 4.2 K, are reported for a number of organotellurium(IV) compounds, including Ar2TeF2, ArTeF3, Ar2Te(OCOCH3)2, Ar2Te(OCOC6H5)2, where Ar = Ph, p-EtOC6H4, p-MeOC6H4, p-C7H7, and the compounds Ph2(CH3)TeI and Ph(CH3)2TeI. Evidence is presented that while the difluorides appear to be similar in structure to the other dihalides(X = Cl, Br, I), in the trifluorides the co-ordination about the tellurium is significantly different to that found in the other trihalides (X = Cl, Br, I). The iodides studied have parameters consistent with their formulation as Ph2(CH3)Te+I− and Ph(CH3)2Te+I−. The dicarboxylates have parameters similar to those of the dihalides, although the diphenyl tellurium diacetate and dibenzoate have relatively small Δ's in comparison with those of the other derivatives studied and it would appear that subtle changes in the co-ordination about tellurium occur with changes in the aryl ligand.

A Mössbauer study of organotellurium compounds. Part I

1976 ◽  
Vol 54 (20) ◽  
pp. 3234-3241 ◽  
Author(s):  
Colin H. W. Jones ◽  
Robert Schultz ◽  
William R. McWhinnie ◽  
Nigel S. Dance
Keyword(s):  
Additive Model ◽  
Mössbauer Study ◽  
Wide Range ◽  
Mössbauer Data ◽  
Organotellurium Compounds

Mössbauer data for a wide range of organotellurium compounds are reported, including compounds of the type: R2Te, Ar2Te, Ar2Te2, R2TeX2, Ar2TeX2, and ArTeX3; where R = alkyl, Ar = aryl, and X = Cl, Br, or I. The isomer shifts and quadrupole splittings are interpreted in terms of the relative populations of the tellurium 5s and 5p orbitals. The quadrupole splittings are rationalized in terms of a simple additive model, formulated within the framework of the Townes and Dailey theory.

A Mössbauer study of organotellurium compounds. Part III. Tellurium heterocycles and related compounds

1978 ◽  
Vol 56 (13) ◽  
pp. 1746-1751 ◽  
Author(s):  
Nigel S. Dance ◽  
Colin H. W. Jones
Keyword(s):  
Heterocyclic Compounds ◽  
Mössbauer Study ◽  
Ring Systems ◽  
Mössbauer Parameters ◽  
Mössbauer Data ◽  
Related Compounds ◽  
Organotellurium Compounds

Mössbauer data are reported for a number of heterocyclic compounds containing tellurium. The influence on the Mössbauer parameters of the constraints imposed by accommodating tellurium in these ring systems are discussed. The influence of the bulky aryl ligand 2-biphenylyl, C12H9—, on the Mössbauer parameters of diaryltellurium dihalides and aryltellurium trihalides has also been investigated.

Pyrophosphates of Tetravalent Elements and a Mössbauer Study of SnP2O7

1975 ◽  
Vol 53 (1) ◽  
pp. 79-91 ◽  
Author(s):  
Chung-Hsi Huang ◽  
Osvald Knop ◽  
David A. Othen ◽  
Frank W. D. Woodhams ◽  
R. Allan Howie
Keyword(s):  
Chemical Shift ◽  
Electric Field ◽  
Electric Field Gradient ◽  
The Other ◽  
Type I ◽  
Type Ii ◽  
Transition Elements ◽  
Mössbauer Study ◽  
X Ray ◽  
Ionic Compounds

Cubic M4+P2O7 pyrophosphates of Ti, Zr, Hf, Sn, and Pb have been examined by X-ray powder diffractometry and by infrared, Raman, and Mössbauer 119Sn spectroscopy. The tin compound appeared to be of Chaunac's type I (with P2O7 groups oriented at random) and could be converted to type II (with ordered P2O7 groups) by heating to high temperatures. All the other preparations were of Chaunac's type II. Evidence from lattice parameters and intensity features of the Raman spectra suggests that the cubic MP2O7 pyrophosphates fall in two groups, one containing the compounds of the typical elements (Ge, Sn, Pb) and the other, the compounds of the transition elements. No support has been found for the view that the P—O—P groupings of the pyrophosphate anion in these compounds are linear. The 119Sn chemical shift in SnP2O7 is only slightly less negative than the shift in CuSnF6.4H2O, which makes SnP2O7 one of the most ionic compounds of tetravalent tin known. The observed quadrupole splitting in the Mössbauer spectrum of SnP2O7 arises largely from the contribution of the valence term to the electric field gradient at the Sn atom.

57Fe and 125Te Mossbauer Study of LiFeCo3TeO8 and LiFeNi3TeO8

1980 ◽  
Vol 3 ◽  
Author(s):  
Andre Gerard ◽  
Fernande Grandjean ◽  
Carlo Flebus
Keyword(s):  
Structural Information ◽  
Magnetic Hyperfine ◽  
Hyperfine Fields ◽  
Mössbauer Study ◽  
Mössbauer Data

ABSTRACT57 Fe and 125 Te Mössbauer data on the spinels LiFeNi3TeO8 and LiFeCo3TeO8 are presented. Structural information relating to site occupations by Fe, valency of Fe and Te and magnetic hyperfine fields are obtained from this study.

Synthesis and structural studies of iron(II) and iron(III) sulfonates

1981 ◽  
Vol 59 (4) ◽  
pp. 669-678 ◽  
Author(s):  
John S. Haynes ◽  
John R. Sams ◽  
Robert C. Thompson
Keyword(s):  
Electronic Spectra ◽  
Lattice Structure ◽  
Magnetic Moments ◽  
The Other ◽  
Antiferromagnetic Coupling ◽  
Structural Studies ◽  
Structural Isomerism ◽  
Mössbauer Data

The iron(II) sulfonates Fe(CF3SO3)2 and Fe(p-CH3C6H4SO3)2 have been prepared and on the basis of vibrational and electronic spectra and magnetic and MÖssbauer data have been assigned a layer lattice structure involving hexacoordinated iron(II) and terdentate bridging anions. The FeO6 chromophore in these compounds is distorted by a trigonal elongation along the C3 axis. Fe(CH3SO3)2 has been obtained in two isomeric forms, one having a trigonal elongation of the FeO6 chromophore, the other a trigonal compression. No structural isomerism has been found for the other iron(II) sulfonates; however, evidence for such isomerism in methanesulfonates of cobalt(II) and zinc(II) is presented. While Fe(CF3SO3)2 and Fe(p-CH3C6H4SO3)2 appear to be magnetically dilute the presence of antiferromagnetic coupling in both forms of Fe(CH3SO3)2 is indicated. The iron(III) sulfonates, Fe(CF3SO3)3, Fe(p-CH3C6H4SO3)3, and Fe(CH3SO3)3, have been prepared and all three are magnetically concentrated exhibiting magnetic moments which are significantly less than 5.92 BM and which decrease with decreasing temperature.

MÖssbauer Study of Iron and Tin Exchanged into Victorian Brown Coal

1980 ◽  
Vol 3 ◽  
Author(s):  
J.D. Cashion ◽  
P.E. Clark ◽  
P.S. Cook ◽  
F.P. Larkins ◽  
M. Marshall
Keyword(s):  
Brown Coal ◽  
Mössbauer Effect ◽  
Local Environment ◽  
The Other ◽  
Line Broadening ◽  
Mossbauer Effect ◽  
Mössbauer Study

ABSTRACTMössbauer effect measurements have been taken of iron and tin introduced into brown coal to act as catalysts for hydrogenation. Spectra taken with 119Sn show that after introduction from solution, the tin appears as SnO2. During subsequent hydrogenation in an autoclave, some of the SnO2 is converted to β-tin and SnS. Ion-exchanged iron is shown from 57Fe measurements to occupy at least one site not populated in the native coal. Line broadening in this site and the other two original sites indicate the existence of variations in the local environment.

Mixed oxidation state compounds of antimony: a 121Sb Mössbauer study of some antimony–fluorine systems

1978 ◽  
Vol 56 (18) ◽  
pp. 2417-2421 ◽  
Author(s):  
Jack G. Ballard ◽  
Thomas Birchall ◽  
Ronald J. Gillespie ◽  
Edward Maharajh ◽  
David Tyrer ◽  
...  
Keyword(s):  
Oxidation State ◽  
Mössbauer Spectra ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Mixed Oxidation ◽  
Mössbauer Data

Antimony-121 Mössbauer spectra for [Sb2F42+][SbF6−]2 and three compounds containing the [Sb3F14−] ion are reported. The Mössbauer data are discussed in relation to their known structures. Two of the compounds give spectra which, on analysis, give η values of unity.

scholarly journals Mössbauer study of iron gall inks on historical documents

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
A. Lerf ◽  
F. E. Wagner ◽  
M. Dreher ◽  
T. Espejo ◽  
J.-L. Pérez-Rodríguez
Keyword(s):  
Middle Ages ◽  
Degradation Products ◽  
Gum Arabic ◽  
Experimental Methods ◽  
Western World ◽  
Historical Documents ◽  
Mössbauer Study ◽  
Mössbauer Data ◽  
Iron Gall ◽  
Forms Of Iron

AbstractIron gall ink was used in the Western world as a permanent writing material already in late Roman times and throughout the Middle Ages, until it became obsolete in the twentieth century. There is much interest in experimental methods to determine the state of the ink and its degradation products on historical documents. Mössbauer spectroscopy with 57Fe is such a method, and it has the particular advantage to be sensitive to the chemical bonding of iron, but this method has only rarely been applied to historical documents. In this paper we present Mössbauer data for two damaged documents from a Library in Granada and a handwritten German book from the eighteenth century. In addition to the inked parts of the manuscripts, ink-free parts were studied to determine the amount and chemical state of the iron in the papers. These new results are discussed in the context of previously published Mössbauer data. In one of the investigated documents Fe(II)-oxalate, FeC2O4·2H2O, was observed. The assignment of the various Fe3+ sites in the different documents is rather difficult and often there is a superposition of various species. Known forms of iron gallate are definitely not present on the inked papers. The observed ferric species can be remains of Fe3+ polyphenol complexes of the ink, complexes of Fe3+ with degradation products of the cellulose of the paper or gum arabic, or very small iron oxide or hydroxide nanoparticles.

An 129I Mössbauer study of organotin iodides

1981 ◽  
Vol 59 (11) ◽  
pp. 1585-1591 ◽  
Author(s):  
C. H. W. Jones ◽  
M. Dombsky
Keyword(s):  
Solid State ◽  
Additive Model ◽  
Mössbauer Study ◽  
Tetrahedral Geometry ◽  
Mössbauer Data

Iodine-129 Mössbauer data for SnI4, MeSnI3, Me2SnI2, Me3SnI, Me3SnI2−, Me3SnI.py, and Me2SnI2.2py are reported. The data are compared with available nqr data for the corresponding chlorides and bromides. The Mössbauer data are interpreted as evidence that MeSnI3, Me2SnI2, and Me3SnI are distorted from tetrahedral geometry in the solid state. The applicability of the additive model in interpreting 119Sn quadrupole splittings in these compounds is commented on.

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