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.

Studies of metal halides. Magnetic properties of some molybdenum(III) binuclear complex halides

1969 ◽  
Vol 22 (1) ◽  
pp. 121 ◽  
Author(s):  
IE Grey ◽  
PW Smith
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Binuclear Complex ◽  
Magnetic Behaviour ◽  
Metal Halides ◽  
Metal Interaction ◽  
Metal Metal ◽  
Halide Complexes

The variation of magnetic susceptibility with temperature for a number of binuclear halide complexes of molybdenum of formula A3IMo2X9 (A = Cs, Et4N, Et3NH; X = Cl, Br) has been studied over the range 90-400�K. The magnetic behaviour is consistent with that expected for magnetically isolated exchange-coupled pairs of molybdenum atoms. The coupling is interpreted as occurring mainly by direct metal-metal interaction rather than superexchange.

scholarly journals Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes

2020 ◽  
Vol 6 (2) ◽  
pp. 20
Author(s):  
Carlos Rojas-Dotti ◽  
Adrián Sanchis-Perucho ◽  
Marta Orts-Arroyo ◽  
Nicolás Moliner ◽  
Ricardo González ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
General Formula ◽  
Crystal Packing ◽  
Variable Temperature ◽  
Magnetic Behaviour ◽  
Octahedral Geometry ◽  
Organic Cations ◽  
Ac Magnetic Susceptibility ◽  
Halide Ions ◽  
Triclinic System

Two mononuclear ReIV complexes of general formula (PPh4)2[ReX6] [PPh4+ = tetraphenylphosphonium cation, X = Br (1) and I (2)] have been prepared and structurally and magnetically characterised. Both compounds crystallise in the triclinic system with space group Pī. Their structures are made up of hexahalorhenate(IV), [ReX6]2−, anions, and bulky PPh4+ cations. Each ReIV ion in 1 and 2 is six-coordinate and bonded to six halide ions in a quasi regular octahedral geometry. In their crystal packing, the [ReX6]2− anions are well separated from each other through the organic cations, generating alternated anionic and cationic layers, and no intermolecular Re−X···X−Re interactions are present. Variable-temperature dc magnetic susceptibility measurements performed on microcrystalline samples of 1 and 2 show a very similar magnetic behaviour, which is typical of noninteracting mononuclear ReIV complexes with S = 3/2. Ac magnetic susceptibility measurements reveal the slow relaxation of the magnetisation in the presence of external dc fields for 1 and 2, hence indicating the occurrence of the field-induced single-ion magnet (SIM) phenomenon in these hexabromo- and hexaiodorhenate(IV) complexes.

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.

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.

scholarly journals Electrochemical, Electrocatalytic, and Magnetic Properties of Vanadium-Containing Polyoxometalates

2021 ◽  
Vol 7 (12) ◽  
pp. 157
Author(s):  
Joseph Dika Manga ◽  
Anne-Lucie Teillout ◽  
Eric Rivière ◽  
Pedro de Oliveira ◽  
Israël Martyr Mbomekallé
Keyword(s):  
Oxidative Stress ◽  
Magnetic Properties ◽  
General Formula ◽  
Low Temperatures ◽  
Magnetic Behaviour ◽  
Ph Values ◽  
Ph Dependency ◽  
Paramagnetic Behaviour ◽  
Electro Oxidation ◽  
Interesting Species

Mono-substituted vanadium-containing Dawson-type polyoxometalates having the general formula α1-[VIVW17X2O62]8− and α2-[VIVW17X2O62]8−, with X = As or P, were synthesised and subject to a comprehensive electrochemical study comprising the pH dependency. These POMs exhibit an electrocatalytic behaviour towards the oxidation of thiols (namely cysteine), rendering them interesting species for mimicking oxidative stress situations, at physiological pH values. The efficiency of the electro-oxidation was assessed with thiols of different nature, and the substrate that responded best was used to compare the electrocatalytic capabilities of the POM series. The magnetic behaviour of these POMs was also evaluated and compared to their analogues, α1- and α2-[VVW17X2O62]7− (X = As or P), at low temperatures and showed, as expected, a paramagnetic behaviour of VIV based compounds.

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 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 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

The magnetic properties of the Tris(2-methyl-1,10-phenanthroline)iron(II) ion

1968 ◽  
Vol 21 (1) ◽  
pp. 83 ◽  
Author(s):  
HA Goodwin ◽  
RN Sylva
Keyword(s):  
Magnetic Properties ◽  
Thermal Equilibrium ◽  
Magnetic Moments ◽  
Anomalous Behaviour ◽  
Ligand Field ◽  
Temperature Dependent ◽  
Methyl Group ◽  
Temperature Range ◽  
Effective Strength

The magnetism of the salts [Fe mephen3]X2 (X = I-, ClO4-, BF4-, PF6-; mephen = 2-methyl- 1,l0-phenanthroline) has been investigated over the temperature range c. 100-300�K. The compounds exhibit anomalous behaviour, and this has been qualitatively interpreted as being the result of the presence of nearly equi-energetic ground terms 1A1 and 5T2 of the complexed iron(11) ion, a thermal equilibrium between these terms causing the magnetic moments to be markedly temperature dependent. This behaviour is apparently the result of the sterie hindrance to the coordination of an iron(11) ion induced by the presence of the methyl group in the ligand and the consequent lowering of the effective strength of the ligand field. The colour of the salts varies with temperature, and this has been discussed in terms of π-bonding between the iron(11) ion and the ligand.

Some magnetic properties of metals. V. Magnetic behaviour of a cylindrical system of electrons for all magnetic fields

1953 ◽  
Vol 216 (1124) ◽  
pp. 118-142 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Wave Function ◽  
Magnetic Susceptibility ◽  
Uniform Magnetic Field ◽  
Magnetic Behaviour ◽  
The Other ◽  
Cylindrical System ◽  
Different Types ◽  
Large Systems

The Wentzel-Kramers-Brillouin method is used to solve the Schrödinger equation for an electron moving in a uniform magnetic field H , the boundary of the system being a cylinder with its axis lying along the direction of the field. It is found that there are two entirely different types of wave-function possible, one type leading to the small Landau diamagnetism of large systems discussed in part I of this series, the other to the larger diamagnetism of small systems discussed in part IV. Taking into account the occupied states of both types, the steady (non-periodic) contributions to the magnetic susceptibility are derived for all fields in both the low- and high-temperature limits, and for most fields at intermediate temperatures.

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