Monosubstituted Derivatives of (L–L)Fe2(CO)6 (L–L = fluorocarbon bridged ligand)

1975 ◽  
Vol 53 (15) ◽  
pp. 2232-2239 ◽  
Author(s):  
Lian Sai Chia ◽  
William R. Cullen ◽  
John R. Sams ◽  
James C. Scott
Keyword(s):  
Mössbauer Spectra ◽  
Spectroscopic Studies ◽  
Bidentate Ligands ◽  
Group V ◽  
Mossbauer Spectra ◽  
First Time ◽  
Derivatives Of

The reaction of the ditertiary arsines and phosphines fnfars, fnfos, and fnAsP, (L–L), with Fe(CO)5 at 150° is a superior route to the complexes (L–L)Fe2(CO)6. Two are reported for the first time (L–L = f6fars, f8fars). The complexes react with monodentate and certain potentially bidentate ligands on u.v. irradiation to afford the monosubstituted derivatives L(L–L)Fe2(CO)5 and (L–L)'(L–L)Fe2(CO)5. Spectroscopic studies, in particular magnetically perturbed Mössbauer spectra, indicate that the site of substitution is trans to the FeA—FeB bond and cis to the two group V atoms (on FeA). Disubstitution seems to result in further displacement of CO from either FeA or FeB.

Dithiolium and diselenolium compounds of the transition metals

1969 ◽  
Vol 22 (1) ◽  
pp. 83 ◽  
Author(s):  
RL Martin ◽  
IM Stewart
Keyword(s):  
Transition Metals ◽  
Temperature Dependence ◽  
Mössbauer Spectra ◽  
Mossbauer Spectra ◽  
First Time

The preparations are reported of an extended series of compounds of the type ML2X4 where M is Mn, Fe, Co, or Ni; X is Cl or Br; and L is analytically identical with dithioacetylacetone. ��� Electronic, infrared, and Mossbauer spectra together with the temperature dependence of the magnetism (80-300�K) of these compounds establish-contrary to previous suggestions in the literature-that they should be properly formulated as tetrahalometallate salts of the 3,5- dimethyl-1,2-dithiolium cation. Simple salts of this cation (such as the iodide) have also been isolated. ��� During the course of this work salts (I- and [CoCl4]2-) of the hitherto unknown 3,5-dimethyl-1,2-diselenolium ion were synthesized and characterized for the first time.

Preparation, Mössbauer and vibrational spectra of diorganotin chromates and carbonates

1976 ◽  
Vol 54 (5) ◽  
pp. 711-717 ◽  
Author(s):  
R. G. Goel ◽  
H. S. Prasad ◽  
G. M. Bancroft ◽  
T. K. Sham
Keyword(s):  
Vibrational Spectra ◽  
Spectroscopic Data ◽  
Mössbauer Spectra ◽  
Structural Features ◽  
Mossbauer Spectra ◽  
Mössbauer Data ◽  
First Time ◽  
Polymeric Structures

Dimethyltin chromate and basic dimethyltin and diphenyltin carbonates have been isolated for the first time. Structural features of these compounds, as well as of the previously known basic dimethyltin chromate, have been investigated by examining their infrared, Raman, and Mössbauer spectra. Infrared, Raman, and Mössbauer spectra of [Me2Sn(NCS)]2O have also been examined, and by comparing its spectroscopic data with those for (Me2Sn)2OCrO4, (Me2Sn)2OCO3, and (Ph2Sn)2O(CO3), possible structures have been suggested for the latter compounds. From the combined infrared and Mössbauer data, a structure is also proposed for Me2SnCrO4. All compounds are indicated to have polymeric structures with bridging CrO42− or CO32−.

Diorganotin(IV) derivatives of monothio β-diketones

1980 ◽  
Vol 33 (5) ◽  
pp. 1137 ◽  
Author(s):  
SK Saini ◽  
VD Gupta ◽  
RC Mehrotra ◽  
RP Tripathi
Keyword(s):  
Molecular Weight ◽  
General Formula ◽  
Mössbauer Spectra ◽  
Mossbauer Spectra ◽  
Derivatives Of

Diorganotin(IV) derivatives of monothio β-diketones of the general formula R2Sn(R'CSCHCOR')2 (R = Me, Bu, Ph; R' = Ph, Me; R'' = Ph, p-FC6H4, 2-F,4-OMeC6H3) have been synthesized by the reactions of R2SnCl2 or R2SnO with monothio β-diketones. Complexes of the type, SnX2(R'CSCHCOR')2 (X = Cl, Br, OAc), have also been synthesized. These compounds have been characterized by element analyses as well as by i.r., 1H n.m.r., and Mossbauer spectra. Ebullioscopic molecular weight determinations show them to be monomeric in benzene.

Disubstituted derivatives of (L—L)Fe2(CO)6 (L—L = fluorocarbon bridged ligand)

1976 ◽  
Vol 54 (20) ◽  
pp. 3185-3191 ◽  
Author(s):  
Lian Sai Chia ◽  
William R. Cullen ◽  
John R. Sams ◽  
James C. Scott
Keyword(s):  
Iron Atom ◽  
Spectroscopic Studies ◽  
The Other ◽  
Bidentate Ligands ◽  
Mössbauer Measurements ◽  
Derivatives Of

The complexes (L—L)Fe2(CO)6 react with a range of bidentate ligands to give the complexes (L—L)′(L—L)Fe2(CO)4 ((L—L) = fluorocarbon-bridged ligand such as f4fars, f4AsP etc. (L—L)′ = fluorocarbon- and hydrocarbon-bridged ligands such as f4AsP diars etc.). Spectroscopic studies, in particular magnetically perturbed Mössbauer measurements, indicate that (L—L)′ in most complexes is chelated to one iron atom, FeA. This leaves one CO group on FeAcis to the FeA—FeB bond and three on FeB. A smaller class of derivatives appear to have (L—L)′ bridging the two iron atoms cis to the FeA—FeB bond. The sign of Vzz is positive at both iron sites in the bridged derivatives. It is negative at FeA and positive at FeB in the other complexes.

New copper(I) derivatives of organotellurium compounds: Synthesis, vibrational and 125Te Mössbauer spectra

1978 ◽  
Vol 29 ◽  
pp. L217-L220 ◽  
Author(s):  
Ian Davies ◽  
william R. McWhinnie ◽  
Nigel S. Dance ◽  
Colin H.W. Jones
Keyword(s):  
Mössbauer Spectra ◽  
Mossbauer Spectra ◽  
Derivatives Of ◽  
Organotellurium Compounds

Magnetische und Mößbauer-spektroskopische Untersuchungen von zeolithischen Eisenkontakten/ Magnetic and Mössbauer Spectroscopic Studies of Iron-Clusters in Zeolites

1975 ◽  
Vol 30 (12) ◽  
pp. 1627-1632 ◽  
Author(s):  
F. Schmidt ◽  
W. Gunsser ◽  
A. Knappwost
Keyword(s):  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Mössbauer Spectra ◽  
Bulk Material ◽  
Spectroscopic Studies ◽  
Ferrous Ions ◽  
Iron Clusters ◽  
Mossbauer Spectra

Abstract Iron clusters have been prepared within zeolite holes by reduction of zeolites containing ferrous ions. The diameter of these particles must therefore be smaller than 13 Å. They are super-paramagnetic and their Mössbauer spectra show no HFS, even at 4 K.The temperature dependence of the magnetic susceptibility of the unreduced zeolites obeys a Curie-Weiss law with peff = 4,54 μB and Θ = 105 K. The Weiss curves of the reduced samples lie distinctly below those of the bulk material.

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 Structure of Derivatives of [SCH3Fe(CO)3]2

1971 ◽  
Vol 49 (18) ◽  
pp. 2948-2952 ◽  
Author(s):  
J. P. Crow ◽  
W. R. Cullen
Keyword(s):  
Mössbauer Spectra ◽  
Methyl Group ◽  
Mossbauer Spectra ◽  
Tertiary Phosphines ◽  
Derivatives Of ◽  
Group Configuration

[SCH3Fe(CO)3]2 when separated into its two known isomers reacts with tertiary phosphines with retention of the sulfur-methyl group configuration. The reaction of the mixture of isomers of [SCH3-Fe(CO)3]2 with ditertiary phosphines and arsines has been studied. Some ligands give bridged complexes and others chelates: one ligand gives both. The p.m.r. and Mössbauer spectra of these complexes are discussed.

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