119Sn Mössbauer Spectra of Sn–Ni Compounds

1975 ◽  
Vol 53 (2) ◽  
pp. 307-310 ◽  
Author(s):  
G. Michael Bancroft ◽  
K. David Butler
Keyword(s):  
Transition Metal ◽  
Mössbauer Spectra ◽  
Solvent Molecule ◽  
Mossbauer Spectra ◽  
Nickel Compounds ◽  
Mössbauer Parameters ◽  
Solvent Molecules

Sn Mössbauer spectra have been recorded for eleven tin-nickel compounds of the type Clx,Sn[NiLCp]4−x (L = CO, PPh3;x = 2,3) and Cl3SnNiL2Cp.S (S = solvent molecule). The center shifts are used to distinguish coordinated SnCl3 and uncoordinated ionic SnCl3−, respectively. In the SnCl3− compounds, the Mössbauer parameters indicate that the solvent molecules are not bonded to the Sn atom. In compounds containing Sn—Ni bonds, the center shifts and quadropole splittings show that Ni(PPh3)Cp is the best donor of the first row transition metal moieties, and that the Sn—Ni bond has the highest Sn s character. Ni(CO)Cp is a slightly poorer donor than Ni(PPh3)Cp, and the Sn—Ni bond has a smaller s character.

Mössbauer studies in transition metal chemistry. IV. Iron(II) complexes of 2-(2'-Pyridyl)benzimidazole

1978 ◽  
Vol 31 (3) ◽  
pp. 487 ◽  
Author(s):  
RL Martin ◽  
IAG Roos ◽  
DML Goodgame ◽  
AASC Machado
Keyword(s):  
Temperature Dependence ◽  
Mössbauer Spectra ◽  
Spin Crossover ◽  
Complex Cation ◽  
Octahedral Symmetry ◽  
Line Lattice ◽  
Metal Chemistry ◽  
Mossbauer Spectra ◽  
Iv Iron ◽  
Mössbauer Parameters

Mossbauer spectra of a number of compounds containing the [Fe(pyb)3]2+ complex cation [pyb, 2-(2'-pyridyl)benzimidazole] confirm that these compounds undergo a change of spin state with temperature consistent with a 5T2-1A1 spin crossover. The nature of the Mossbauer spectra and their temperature-dependence are sensitive to the associated anion and the method of preparation. ��� The temperature-dependence of the Mossbauer parameters has been used to derive information about the distortions from octahedral symmetry and it is concluded that the dimensions of the crystal-line lattice are changing slightly with temperature.

scholarly journals Organometallphosphin-substituierte Übergangsmetallkomplexe, XXVII [1] Reaktionen von Pentacarbonylmangan-und Pentacarbonylrheniumbromid mit Organoelement(rVb)phosphinen / Organometalphosphine-Substituted Transition Metal Complexes, XXVII [1] Reactions of Pentacarbonylmanganese-and Pentacarbonylrheniumbromide with Organoelement(IVb) Phosphines

1981 ◽  
Vol 36 (6) ◽  
pp. 708-712 ◽  
Author(s):  
Herbert Schumann ◽  
Heinrich Neumann
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Mössbauer Spectra ◽  
Rhenium Complexes ◽  
Tert Butyl ◽  
Mossbauer Spectra ◽  
Dirhenium Complexes

Abstract The reactions of pentacarbonyl manganese bromide and pentacarbonyl rhenium bromide with di(tert-butyl)trimethylsilyl phosphine, teri-butyl-bis(trimethylsilyl)-, -(germyl)-, -(stannyl) phosphine, as well as with tris(trimethylsilyl)-, -(germyl)-, and -(stannyl) phosphine result in the elimination of one CO ligand and the formation either of corresponding bromo-tetracarbonyl(organometalphosphine)manganese or -rhenium complexes or of corresponding octacarbonyl-bis(μ-organometalphosphido)dimanganese or -dirhenium complexes. The IR, NMR, and Mössbauer spectra are reported and discussed.

121Sb Mössbauer Spectra of Hypervalent Complexes Having an Antimony-transition Metal Bond and Partial Quadrupole Coupling Constants

2002 ◽  
Vol 57 (6-7) ◽  
pp. 631-639 ◽  
Author(s):  
Masashi Takahashi ◽  
Atsushi Ishiguro ◽  
Masaki Maeda ◽  
Masuo Takeda ◽  
Koichiro Toyota ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Transition Metal ◽  
Mössbauer Spectra ◽  
Coupling Constants ◽  
Metal Bond ◽  
Mossbauer Spectra ◽  
Electronic Feature ◽  
Quadrupole Coupling ◽  
Related Compounds ◽  
Donor Power

Antimony-121 Mössbauer spectra for hypervalent pentacoordinate antimony compounds having Sb-transition metal bond [Rf2SbMCp(CO)n {RfH = o-C6H4C(CF3)2OH- , M = Fe, Ru, Cr,Mo, W}, Rf2SbFeCp(CO)PPh3, Rf2SbFeCp(dppe)] and closely related compounds Rf2SbTol (Tol = p-CH3C6H4), Rf2SbX (X = Cl, Br) are described. The strong -donor power of the metal fragments is demonstrated by theM¨ossbauer parameters. The -donor power decreases in the order FeCp(dppe) > FeCp(CO)PPh3 > FeCp(CO)2 > RuCp(CO)2 > CrCp(CO)3 > MoCp(CO)3 > WCp(CO)3 ≫Tol. The essential trends in the molecular structure and the Berry pseudorotation are interpreted by this order. In addition, the e2qQ values for 32 hypervalent antimony compounds are successfully calculated using the additivity model for the e2qQ value. A unique electronic feature for Rf2SbX is clarified through the calculation

scholarly journals Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, III Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems ZnFeVO4-Fe3O4 / Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, III X-ray Investigation and Mössbauer Spectra of the Spinel System ZnFeVO4-Fe3O4

1981 ◽  
Vol 36 (10) ◽  
pp. 1228-1233 ◽  
Author(s):  
Erwin Riedel ◽  
Hümeyra Anik ◽  
Till Dützmann
Keyword(s):  
Mössbauer Spectra ◽  
X Ray ◽  
Lattice Constants ◽  
Mossbauer Spectra ◽  
Mössbauer Parameters ◽  
Spinel System

Abstract The spinel system Zni_zFe2:[Fei+2;Vi_I]04 has been prepared by heating mixtures of ZnFeV(>4 and Fe3Ü4 at 1000 °C. The lattice constants, the oxygen parameters and the Mössbauer parameters show that a transition from a nearly normal to an inverse distribu-tion of Fe(II) and Fe(III) exists.

M÷ssbauer studies in transition metal chemistry. I. Compounds of iron with Dithioacetylacetone (Pentane-2,4-dithione)

1971 ◽  
Vol 24 (11) ◽  
pp. 2231 ◽  
Author(s):  
RL Martin ◽  
IAG Roos
Keyword(s):  
Transition Metal ◽  
Temperature Dependence ◽  
Quadrupole Splitting ◽  
Ground State ◽  
Mössbauer Spectra ◽  
Transition Metal Chemistry ◽  
Temperature Dependent ◽  
Orbital Degeneracy ◽  
Metal Chemistry ◽  
Mossbauer Spectra

The temperature dependence of the Mossbauer spectra of some iron- containing compounds of dithioacetylacetone are reported between 4 and 293 K. ��� The quadrupole splitting ΔEq of [Fe(SacSac)3] is larger than usually observed for low-spin six-coordinated iron(III) and is ascribed to the lifting of orbital degeneracy of the 2T2 ground state by small axial and rhombic distortions. ��� The unsubstituted and phenyl-substituted dithiolium salts of [FeCl4]2- exhibit strongly temperature-dependent quadrupole splittings, which arise directly from the lifting of the orbital degeneracy of the 5E ground state due to distortion of the [FeCl4]2- tetrahedron.

A125Te Mössbauer study of hexahalotellurates, pentahalotellurates, and tetrahaloaryltellurates

1981 ◽  
Vol 59 (6) ◽  
pp. 913-917 ◽  
Author(s):  
Nigel S. Dance ◽  
Pablo Dobud ◽  
Colin H. W. Jones
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Additive Model ◽  
Single Line ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Mössbauer Parameters

The 125Te Mössbauer spectra of a number of hexahalotellurates have been measured and no significant effects of the size or symmetry of the cation on the Mössbauer parameters were observed. The mixed hexahalotellurates, M2TeX4Y2 (X, Y = Cl, Br, or I), do not exhibit a quadrupole splitting, Δ, and the trends in δ with variation in X and Y are discussed. The pentahalotellurates MTeCl5, MTeBr5, and MTeBr4Cl also yield single line spectra and this is interpreted as evidence of intermolecular bridging. The tetrahaloaryltellurates MArTeX4 and MArTeX3Y (X, Y = Cl, Br, or I) have been studied and the trends in Δ with variation X and Y are consistent with an additive model. The trends in δ are more complex.

Studies of the orthoamphiboles. IV. Mössbauer spectra of anthophyllites and gedrites

1989 ◽  
Vol 53 (370) ◽  
pp. 181-191 ◽  
Author(s):  
Anthony D. Law
Keyword(s):  
Mössbauer Spectra ◽  
Single Model ◽  
Mossbauer Spectra ◽  
Mössbauer Parameters

AbstractFitted Mössbauer spectra are presented for a set of anthophyllites and gedrites. Despite their complexity it is possible to obtain fits for gedrite spectra and the Mössbauer parameters are consistent with results for anthophyllites from this and previous studies. At least three doublets are required to fit the Fe2+absorption in gedrites; there is no single model at present to explain the behaviour of the spectra. Fe3+absorption is also resolved.

Tin-119m Mössbauer spectra of trimethyltin phosphines used as ligands in transition metal carbonyl complexes

1976 ◽  
Vol 121 (3) ◽  
pp. 321-326 ◽  
Author(s):  
H. Schumann ◽  
W.-W. du Mont ◽  
H.J. Kroth ◽  
H. Neumann ◽  
P.J. Corvan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Mössbauer Spectra ◽  
Metal Carbonyl ◽  
Carbonyl Complexes ◽  
Mossbauer Spectra ◽  
Metal Carbonyl Complexes
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