Basic halides and related species of molybdenum(III). II. Spectroscopic and magnetic properties of MoOF(H2O)3 and MoOCl(H2O)3

1976 ◽  
Vol 29 (4) ◽  
pp. 717 ◽  
Author(s):  
DJ Stabb
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Absorption Spectroscopy ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Related Species ◽  
Bound Water ◽  
Temperature Range ◽  
Field Dependent

Two basic halides of molybdenum(111), namely MoOF(H2O)3 and MoOCl(H2O)3 (some samples containing additional loosely bound water), were investigated by absorption spectroscopy in the range 200-50000 cm-1, and by magnetic susceptibility measurements over a temperature range of 100-300 K. Infrared spectra showed bands at about 670 and 1600 cm-l, but not in the range 800-1100 cm-1. Electronic spectra showed poorly defined bands superimposed on strong general absorption. Very weak paramagnetism was observed: this was field dependent. The results are interpreted to show the compounds to be oxygen-bridged polymers [MOX(H2O)3O]n, rather than species containing Mo=O or Mo-0-H groups.

Spectral and Magnetic Properties of Dithiocyanato bis (Biguanide) Chromium(III) Thiocyanate

1974 ◽  
Vol 29 (7-8) ◽  
pp. 492-494 ◽  
Author(s):  
A. Syamal
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Infrared Spectra ◽  
Magnetic Moment ◽  
Electronic Spectra ◽  
Title Compound ◽  
Ligand Field ◽  
Octahedral Structure ◽  
Modified Method ◽  
Infrared Spectral

A reinvestigation of the title compound is reported. The compound has been prepared by a modified method and characterised by infrared spectra, electronic spectra and magnetic susceptibility measurements. The infrared spectral data suggest that the two coordinated thiocyanate ions are bonded to chromium(III) through N atoms rather than the S atoms. The complex exhibits two ligand field bands at 20410 and 26660 cm-1 due to the transitions 4A2g → 4T2g and 4A2g → 4T1g (F) respectively. Electronic spectral and magnetic moment data suggest that the complex has an octahedral structure with d2sp3 bonding.

Magnetische Eigenschaften von [Cu{OCH2CH2N(C4H9)2}NCO]4 im Bereich von 10 bis 240 K / Magnetic Properties of [Cu{OCH2CH2N(C4H9)2}NCO]4 in the Temperature Range from 10 to 240 K

1998 ◽  
Vol 53 (1) ◽  
pp. 58-62
Author(s):  
W. Münch ◽  
L. Walz ◽  
M. König
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Title Compound ◽  
Temperature Range ◽  
New Phase ◽  
Exchange Parameters

The magnetic properties of the title compound were re-investigated, since a new phase below 240 K has recently been identified. The exchange parameters were evaluated from the temperature dependence of the magnetic susceptibility with a Heisenberg operator taking into account the high pseudo-symmetry of the tetrameric units observed.

Synthesis and structure of 4-methylpyridine complexes of cobalt(II) and nickel(II) hexafluorophosphate and hexafluoroarsenate

1978 ◽  
Vol 56 (7) ◽  
pp. 985-991 ◽  
Author(s):  
Raymond M. Morrison ◽  
Robert C. Thompson
Keyword(s):  
Magnetic Properties ◽  
Field Strength ◽  
Single Crystal ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Preliminary Report ◽  
Ligand Field ◽  
X Ray Diffraction ◽  
X Ray ◽  
Square Planar

The complexes M(4mepy)4A2 and M(H2O)2(4mepy)8A2 (where M is Ni or Co and A is PF6 or AsF6) have been prepared and their electronic spectra and magnetic properties studied. A preliminary report is made of single crystal X-ray diffraction studies on Ni(H2O)2(4mepy)8(PF6)2, Co(H2O)2(4mepy)8(PF6)2, and Co(4mepy)4(PF6)2. All of the complexes have structures involving complex cations and non-coordinated anions, consistent with extremely weak ligating abilities for both PF6− and AsF6−. Cations identified and characterized are the squashed tetrahedral [Co(4mepy)4]2+ ion, the square planar [Ni(4mepy)4]2+ ion, and the tetragonal [Co(4mepy)4((4mepy)2H2O)2]2+and [Ni(4mepy)4((4mepy)2H2O)2]2+ ions. The ligand field strength of 4-methylpyridine is found to be indistinguishable from that of pyridine in these complexes. Infrared spectra are reported and infrared criteria for establishing the presence of non-coordinated anions in PF6− and AsF6− complexes are suggested.

Synthesis, structure, and properties of poly-bis(μ-diethylphosphinato)copper(II)

1982 ◽  
Vol 60 (15) ◽  
pp. 2017-2022 ◽  
Author(s):  
Katherine W. Oliver ◽  
Steven J. Rettig ◽  
Robert C. Thompson ◽  
James Trotter
Keyword(s):  
Molecular Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Infrared Spectra ◽  
Field Model ◽  
Direct Methods ◽  
Coordination Geometry ◽  
Structure And Properties ◽  
Tetrahedral Coordination ◽  
Full Matrix

The preparation, magnetic properties, electronic and infrared spectra, and molecular structure of poly-bis(μ-diethylphosphinato)copper(II) are described. Crystals of poly-bis(μ-diethylphosphinato)copper(II) are triclinic, a = 7.700(1), b = 9.807(1), c = 10.101(1) Å, α = 90.48(1), β = 104.77(1), γ = 112.21(1)°, Z = 2, space group [Formula: see text]. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to R = 0.025 and Rw = 0.032 for 3491 reflections with I ≥ 3σ(I). The polymeric structure consists of Cu atoms with flattened tetrahedral coordination geometry linked by double phosphinate bridges. Mean bond lengths (corrected for libration) are: Cu—O, 1.924(3), P—O, 1.526(4), and P—C, 1.807(4) Å. Assignment of the electronic spectrum using a crystal field model gives Dq = 1665 cm−1 and Cp = 1800 cm−1. Magnetic susceptibility studies give no evidence for magnetic concentration over the temperature range 80 to 300 K.

Synthesis and Properties of Ionogels Based on 1-vinyl-3-alkylimidazolium Tetrahalogenidoferrate (III) [VAIM][FeClnBr4-n] and PMMA

2013 ◽  
Vol 702 ◽  
pp. 74-78 ◽  
Author(s):  
Yi Mei Tang ◽  
Xiao Ling Hu ◽  
Li Wei Qian ◽  
Ping Guan
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Magnetic Properties ◽  
Ionic Liquid ◽  
Magnetic Susceptibility ◽  
Alkyl Chain ◽  
Imidazole Ring ◽  
The Self ◽  
Weiss Temperature ◽  
Temperature Range

The paramagnetic ionic liquid (IL) 1-vinyl-3-alkylimidazolium tetrahalogenidoferrate (Ⅲ) [VAIM][FeClnBr4-n] (A= n-butyl, n-pentyl, n-hexyl; n=3,4 or 2, 3,4.) has been used in the synthesis of paramagnetic [VAIM][FeClnBr4-n]/PMMA ionogels. The thermal stability for the ionogels increases significantly compared with [VAIM][FeClnBr4-n] and PMMA. Magnetic susceptibility measurements were carried out in the temperature range 1.8 K–300 K. The Curie–Weiss temperature is -0.989 K, -0.669 K and -0.169 K, respectively as the alkyl chain to 3 position of imidazole ring elongate. The magnetic properties are similar to those reported for the pure IL and the self-made [VAIM][FeClnBr4-n] and are not influenced by the incorporation of paramagnetic [VAIM][FeClnBr4-n] into the PMMA matrix. The magnetic ionogel is thus an interesting material combining the mechanical properties of the polyer with the functionality of the magnetic IL, such as magnetism.

Magnetic properties of some copper(II) complexes of benzimidazolylalkanols

1973 ◽  
Vol 26 (5) ◽  
pp. 997 ◽  
Author(s):  
GJ Hamilton ◽  
E Kokot
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
General Formula ◽  
Magnetic Behaviour ◽  
Methyl Group ◽  
Temperature Range

The magnetic susceptibility in the temperature range 80-400 K is reported for copper(II) complexes of the general formula CuLX, where L is benzimidazole substituted in the 2-position by α- or β-hydroxyalkyl groups and in some cases also in the N-position by a methyl group and X is Br-, Cl-, or acetate. The magnetic behaviour of 1-(benzimidazol-2- yl)alkanolato complexes is interpreted in terms of antiferro- magnetically exchange-coupled pairs of copper atoms. The 2- (benzimidazol-2-yl)-alkanolato complex is a linear antiferromagnet.

Magnetic properties of rare earth chromium borates at high temperatures

2021 ◽  
pp. 166-170
Author(s):  
O.K. Kuvandikov ◽  
◽  
N.I. Leonyuk ◽  
V.V. Malsev ◽  
M.M. Kuzmin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Temperature Dependence ◽  
High Temperatures ◽  
Wide Temperature Range ◽  
Magnetic Moments ◽  
Chemical Formula ◽  
Temperature Range ◽  
Curie Temperatures

Temperature dependence of the magnetic susceptibility has been studied for rare-earth borates NdCr3(BO3)4, SmCr3(BO3)4 and LuCr3(BO3)4 by the Faradey method in the wide temperature range (300-1200 K). The dependence for each phase follows the Curi - Weis law. The Curie temperatures, Neel temperatures and magnetic moments corresponding to the chemical formula of the crystals, have been found.

scholarly journals Coordinating Properties of the Fluorosulfate Ion. Tetrakis(pyridine) Complexes of Zinc(II), Copper(II), and Nickel(II) Fluorosulfates

1974 ◽  
Vol 52 (18) ◽  
pp. 3218-3228 ◽  
Author(s):  
Carl S. Alleyne ◽  
Robert C. Thompson
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Metal Ions ◽  
Electronic Properties ◽  
Infrared Spectra ◽  
Copper Complex ◽  
Electronic Spectra ◽  
Nickel Complexes ◽  
Ionic Dissociation ◽  
Distorted Octahedral

Complexes of the type M(py)4(SO3F)2 (py = pyridine, M = Ni, Cu, Zn) have been prepared and characterized. Infrared spectra of all three complexes, electronic spectra and magnetic susceptibility studies of the copper and nickel complexes, and e.p.r. studies of the copper complex are reported. The complexes have tetragonally distorted octahedral structures with fluorosulfate groups coordinated to metal ions as unidentate ligands. To facilitate comparison of the coordinating action of the fluorosulfate ion with other polyatomic anions the complexes, Cu(py)4X2 (X = ClO4−, BF4−, NO3−, p-CH3C6H4SO3−, CF3CO2−) have been prepared and their electronic properties examined. The studies indicate that the coordinating strength of SO3F− towards metals is greater than ClO4−, BF4−, and NO3− but less than p-CH3C6H4SO3− and CF3CO2−. Electrical conductivity studies on solutions in acetonitrile indicate a correlation between the relative coordinating strength of the anion in a given complex and the extent to which the complex undergoes ionic dissociation in this solvent.

scholarly journals Magnetic susceptibility and related properties of rare-earth crystals

1939 ◽  
Vol 170 (940) ◽  
pp. 112-129 ◽  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Specific Heat ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Magnetic Susceptibilities ◽  
Temperature Range ◽  
The Mean

This paper has arisen from attempts to correlate the results of experiments on magnetic susceptibilities, specific heat and absorption spectra of rareearth crystals. No theory has yet been advanced which is capable of giving simultaneous quantitative numerical agreement on all these properties, nor indeed does it seem possible to develop such a theory. For reasons which we shall explain, it seems more likely that some of the data are wrong, or at least, that they have been wrongly interpreted. Many measurements have been made of the magnetic properties of hydrated rare-earth crystals. Accurate values of the mean molecular susceptibility, X , have been obtained over a temperature range from a few degrees absolute to room temperature, and the anisotropy of the susceptibility at room temperature has also been measured

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