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

121Sb Mössbauer Spectra of Hexafluorocumyl Alcohol Complexes of Sb(V), and of Sb(III) with Negative Quadrupole Coupling Constants

1993 ◽  
Vol 22 (12) ◽  
pp. 2037-2040 ◽  
Author(s):  
Masuo Takeda ◽  
Masashi Takahashi ◽  
Yasuo Yanagida ◽  
Satoshi Kojima ◽  
Kin-ya Akiba
Keyword(s):  
Mössbauer Spectra ◽  
Coupling Constants ◽  
Mossbauer Spectra ◽  
Quadrupole Coupling

35Cl-, 75As-NQR- und 197Au-Mößbauer-Untersuchungen an Gold(I)-chlorid-Komplexen / 35Cl-, 75As-NQR- and 197Au-Mössbauer Investigations of Gold(I)-chloride Complexes

1976 ◽  
Vol 31 (12) ◽  
pp. 1607-1610 ◽  
Author(s):  
H. Schmidbaur ◽  
D. Koth ◽  
F. E. Wagner
Keyword(s):  
Mössbauer Spectra ◽  
Coupling Constants ◽  
Chloride Complexes ◽  
Mossbauer Spectra ◽  
Sulfide Ligands ◽  
Quadrupole Coupling

35Cl and 75As NQR spectra have been recorded for six gold(I) chloride complexes with phosphine, arsine and sulfide ligands. Though no 197Au–NQR signals were detected, good 197Au-Mössbauer spectra could be obtained for the same compounds and some homologs. A discussion of the results has shown, that no consistent correlation is evident between the nature of the ligands and the 35Cl and 75As quadrupole coupling constants, 197Au isomeric shifts and quadrupole splittings.

Ab Initio Bonding, Molecular Structure, and Quadrupole Coupling Constants of Aluminum Chlorides

2001 ◽  
Vol 105 (17) ◽  
pp. 4371-4378 ◽  
Author(s):  
Gilbert J. Mains ◽  
Evangelos A. Nantsis ◽  
W. Robert Carper
Keyword(s):  
Molecular Structure ◽  
Ab Initio ◽  
Coupling Constants ◽  
Quadrupole Coupling

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.

(CH3)3CCOOSbCl4: Structure Determination by Zeeman Perturbed NQR

1986 ◽  
Vol 41 (1-2) ◽  
pp. 129-133 ◽  
Author(s):  
Maria L. S. Garcia ◽  
Edwin A. C. Lucken
Keyword(s):  
Molecular Structure ◽  
Magnetic Field ◽  
Crystal Structure ◽  
Single Crystal ◽  
Structure Determination ◽  
Organic Ligand ◽  
Coupling Constants ◽  
Zero Field ◽  
Quadrupole Coupling ◽  
Asymmetry Parameters

A single crystal of tetrachloro(0,0-pivaloylato)antimony(V) has been studied at 77 K, byZeeman perturbed 35Cl NQR, using a FT-NQR pulsed spectrometer. The four lines at zero-field, ν1 = 27.6468, ν2= 27.3070, ν3= 25.7341 and ν4= 25.3438 MHz yield eight EFG tensors in themagnetic field, related by a twofold symmetry element in the crystal. The correspondingasymmetry parameters are η1, = 0.134, η2 = 0.13, η3= 0.07, and η4 = 0.09. The molecular structurededuced from the relative orientations of the principal Z-axes of the EFG tensors confirms that thehigher quadrupole coupling constants are associated with the chlorine atoms in equatorial positions,relative to the plane of the organic ligand, as predicted from NQR powder studies. It is concludedthat the crystal structure is monoclinic with two (class m or 2) or four (class 2/m) moleculesper unit cell. The molecular packing is such that the planes formed by equatorial or axial chlorineatoms are approximately at right angles to their symmetry related images.

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.

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.

Microwave spectroscopic study on the molecular structure and the quadrupole coupling constants of thionyl chloride

1981 ◽  
Vol 73 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Sigenari Suzuki ◽  
Masabumi Yamaguchi ◽  
Masao Onda ◽  
Takesffi Sakaizumi ◽  
Osamu Ohashi ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Spectroscopic Study ◽  
Thionyl Chloride ◽  
Coupling Constants ◽  
Quadrupole Coupling
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