Study of structure of tetranuclear cluster of Fe with fluoroacetic acid by means of M�ssbauer spectroscopy and x-ray structure temperature analysis

1985 ◽  
Vol 26 (2) ◽  
pp. 197-201 ◽  
Author(s):  
R. A. Stukan ◽  
V. I. Ponomarev ◽  
V. P. Nifontov ◽  
K. I. Turt� ◽  
L. O. Atovmyan
Keyword(s):  
Temperature Analysis ◽  
Fluoroacetic Acid ◽  
Tetranuclear Cluster ◽  
X Ray ◽  
Ssbauer Spectroscopy

scholarly journals Development of X-ray Diffractometer for High Temperature Analysis.

Materia Japan ◽  
1995 ◽  
Vol 34 (6) ◽  
pp. 783-785 ◽  
Author(s):  
Toru Fujimura ◽  
Jun-ichi Shimomura ◽  
Shuji Gomi ◽  
Michio Katayama ◽  
Yuji Kobayashi
Keyword(s):  
High Temperature ◽  
Temperature Analysis ◽  
X Ray

On the Reaction of C(PPh3)2 with [Co2(CO)8]: Formation and Structure of an Unusual Tetranuclear Cluster

2007 ◽  
Vol 62 (3) ◽  
pp. 413-418 ◽  
Author(s):  
Wolfgang Petz ◽  
Kirstin Wenck ◽  
Bernhard Neumüller
Keyword(s):  
Electron Donor ◽  
High Yield ◽  
Triclinic Space Group ◽  
Tetranuclear Cluster ◽  
Space Group ◽  
X Ray ◽  
Bonding Mode

The reaction of the carbodiphosphorane C(PPh3)2 (1) with [Co2(CO)8] results in the formation of the salt-like complex (HC{PPh3}2)[Co(CO)4] (2) in high yield if THF is used as the solvent. The proton of the cation stems from THF degradation. When the reaction is carried out in toluene, the tetranuclear cluster [Co4(CO)10(PPh3)(μ4-CCPPh3)] (3) is formed in low yield as the only complex which could be identified by X-ray analysis. The solvate 3 ·C7H8 crystallizes in the triclinic space group P1̄ with a = 1040.8(2), b = 1387.4(2), c = 1923.0(2) pm, α = 71.96(1)°, β = 88.69(1)°, γ = 71.46(1)°, Z = 2. The structure of the cluster with 64 CVE is that of a “spiked triangle” in which the triphenylphosphonioacetylide CCPPh3 acts as a six-electron donor and the bonding mode is that of a μ4-η2 coordination.

scholarly journals Epr Spectrum Angular Dependences In Liyf4 Crystal / Epr Spektru Leņķiskās Atkarības Liyf4 Kristālā

2012 ◽  
Vol 49 (6-I) ◽  
pp. 49-54
Author(s):  
A. Antuzevics ◽  
A. Fedotovs ◽  
U. Rogulis
Keyword(s):  
Room Temperature ◽  
Temperature Analysis ◽  
Epr Spectrum ◽  
Spectral Parameters ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Crystal Growth Process ◽  
Before And After ◽  
Impurity Ion ◽  
Electron Paramagnetic

Abstract Electron paramagnetic resonance (EPR) measurements have been made for two perpendicular planes in a LiYF4 crystal before and after x-ray irradiation at room temperature. Analysis of the EPR spectrum angular dependence shows the presence of two defects - an impurity ion, which was embedded during the crystal growth process, and an x-ray induced defect with the g-factor of approx. 2.0. Spectral parameters and possible defect models are discussed.

XRD Multi-Temperatures Study of N,N'-bis(2-Hydroxyethyl)Benzene-1,4-Dicarboxamide

2010 ◽  
Vol 163 ◽  
pp. 256-259
Author(s):  
Gabriela Bednarek ◽  
Maria Nowak ◽  
Joachim Kusz ◽  
Jerzy Ossowski
Keyword(s):  
Crystal Structure ◽  
Density Functional Theory ◽  
Dft Calculations ◽  
Chemical Reactions ◽  
Title Compound ◽  
Density Functional ◽  
Temperature Analysis ◽  
Functional Theory ◽  
X Ray ◽  
The Stability

N,N’ – bis – (2– hydroxy – ethylene) – terephthalamide (BHETA) has been obtained by aminolysis of polyethylene terephthalate (PET) using excess of monoethanoloamine and it has been physicochemically characterized [1]. In this paper there are shown the results of the multi-temperature X-ray measurement which were performed to provide information about the stability of the structure. Detailed temperature analysis of the crystal structure allows us to determine properties of the compound which is very important product of recycling PET wastes in order to use it for further chemical reactions. The structure of the title compound was also modelled by density functional theory (DFT) calculations.

Two-component temperature analysis of OSO-5 X-ray flare data

Solar Physics ◽  
1973 ◽  
Vol 28 (1) ◽  
pp. 169-174 ◽  
Author(s):  
J. R. H. Herring ◽  
I. J. D. Craig
Keyword(s):  
Temperature Analysis ◽  
X Ray ◽  
Two Component ◽  
Component Temperature

scholarly journals The Synthesis and Study of Tetranuclear Cluster [Fe4O2(CCl3COO)8(THF)2(DMF)(H2O)]⋅THF

2006 ◽  
Vol 1 (1) ◽  
pp. 77-83
Author(s):  
Denis Prodius ◽  
Valeriu Mereacre ◽  
Shova Sergiu ◽  
Maria Gdaniec ◽  
Yurii Simonov ◽  
...  
Keyword(s):  
Coordination Number ◽  
Magnetic Measurements ◽  
The Novel ◽  
Antiferromagnetic Exchange ◽  
Spin Hamiltonian ◽  
Magnetic Studies ◽  
Tetranuclear Cluster ◽  
X Ray ◽  
Infra Red ◽  
Fitting Parameters

The novel bis(μ3-oxo) tetranuclear trichloracetate cluster, [Fe4O2(CCl3COO)8(THF)2(DMF)(H2O)]⋅THF (1), has been synthesised and subsequently characterised by X-ray structure analysis, magnetic measurements and infra red (IR). The structure of cluster is “butterfly” type. The Fe···Fe separation has the value of 2.883(1) - 3.441(7) Å. The coordination number of iron (III) is 6. Magnetic studies reveal the presence of an antiferromagnetic exchange in the parallelogram skeletons of the tetranuclear species. Using the spin Hamiltonian H = -2Jwb(Ŝ1Ŝ2 + Ŝ2Ŝ3 + Ŝ3Ŝ4 + Ŝ4Ŝ1) - 2JbbŜ2Ŝ4v+ gμβ(Ŝ1z + Ŝ2z +Ŝ3z + Ŝ4z)B, the fitting parameters Jbb = - 14.3 cm-1, Jwb = - 32.1 cm-1 , g = 2.07, ρparam. -5 impur. = 4.2 %, ΘCurie-Weiss const. = -0.5 K and R = 6.8·10 were obtained.

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