Magnetic susceptibility of Tri-Coordinated copper(II) complexes

1957 ◽  
Vol 10 (4) ◽  
pp. 386 ◽  
Author(s):  
M Kishita ◽  
Y Muto ◽  
M Kubo
Keyword(s):  
Magnetic Susceptibility ◽  
Chemical Analysis ◽  
Copper Atom ◽  
Room Temperature ◽  
Copper Complexes ◽  
Magnetic Moments ◽  
The Other ◽  
Acetate Monohydrate ◽  
Magnetic Susceptibilities ◽  
Cupric Acetate

The magnetic susceptibilities of salicylal-o-hydroxybenzylamine Cu(II), salicylal-o-hydroxyanil Cu(II), acetylacetone-mono-(0-hydroxyanil) Cu(II), and benzoylacetone- mono-(0-hydroxyanil) Cu(II), as well as their pyridinates, have been measured by the Gouy method at room temperature. The effective magnetic moments calculated from the . data of the pyridine-free complexes per one copper atom are smaller than the theoretical moment, 1.73 B.M., for one odd electron. Although it has been presumed from the method of synthesis, the chemical analysis of the complexes, and the tridentate nature of the ligand molecules that the copper atoms of the chelates have the unusual coordination number 3, the subnormal magnetic moments suggest the presence of dimeric molecules, in which two copper atoms are very close to each other as in cupric acetate monohydrate. On the other hand, the pyridinates have normal magnetic moments expected for tetra-coordinated copper complexes.

Magnetic properties and structure of some copper(II) complexes of pyridine and quinoline N-oxides

1967 ◽  
Vol 20 (11) ◽  
pp. 2403 ◽  
Author(s):  
SJ Gruber ◽  
CM Harris ◽  
E Kokot ◽  
SL Lenzer ◽  
TN Lockyer ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Moments ◽  
Paramagnetic Complex ◽  
Water Molecules ◽  
Acetate Monohydrate ◽  
Binuclear Copper ◽  
Kcal Mole ◽  
Ferromagnetic Interaction ◽  
Magnetic Susceptibilities

The magnetism of various copper(II) complexes of pyridine and quinoline N-oxides1 has been further investigated. The compounds Cu(C5H5NO)nX2 (where n = 4 or 6, X = ClO4; n = 2, X = Cl, Br, NCS; n = 1, X = Cl, Br, CH3COO) and Cu(C9H7NO)nX2 where n = 4, X = ClO4; n = 2, X = Cl, Br, NO3; n = 1, X = Cl, Br, CH3COO) have been studied. The variation of the magnetic susceptibilities of most of these compounds is reported over a temperature range. The variation of the magnetic susceptibility with temperature for the weakly paramagnetic complex Cu(C5H5NO)Cl2 is discussed in terms of the binuclear oxygen-bridged structure previously postulated.1 The compound exhibits anti-ferromagnetic interaction between pairs of copper(II) atoms with a singlet-triplet separation of 2.1 kcal/mole. The compounds Cu(C5H5NO)2Cl2, Cu(C5H5NO)Br2, and Cu(C9H7NO)X2 (X = Cl, Br) are more weakly paramagnetic due to a larger singlet-triplet separation. The compound Cu(C5H5NO)2Br2 possesses a higher paramagnetic susceptibility than those of the previous compounds, and its magnetic properties are consistent with a dimeric structure involving a singlet- triplet separation of 0.7 kcal/mole. The copper(II) acetate adducts, Cu(CH3COO)2,L (L = C5H5NO or C9H7NO), possess very similar magnetic properties to binuclear copper(II) acetate monohydrate and presumably possess a similar structure, with the N-oxides replacing the water molecules. These compounds exhibit singlet-triplet energies of c. 1 kcal/mole similar to values reported for a large number of copper(II) alkanoates. The compounds Cu(C5H5NO)2(NCS)2, Cu(C5H5NO)4(ClO4)2, Cu(C5H5NO)6- (ClO4)2, Cu(C9H7NO)2X2 (X = Cl, Br, NO3), all obey the Curie-Weiss law and possess mean magnetic moments of 1.89, 1.80, 1.93, 1.88, 1.96, and 1.88 B.M. (corrected for θ values of -12, -7, -8, + -4, and -16�) respectively.

Magnetic susceptibility and the structure of Tri-coordinated copper(II) Complexes

1958 ◽  
Vol 11 (3) ◽  
pp. 309 ◽  
Author(s):  
M Kishita ◽  
Y Muto ◽  
M Kubo
Keyword(s):  
Magnetic Susceptibility ◽  
Copper Atom ◽  
Copper Complexes ◽  
Magnetic Moments ◽  
Three Dimensional ◽  
Preceding Paper ◽  
Exchange Effect ◽  
Planar Configuration ◽  
Copper Chelates ◽  
Close Distance

The magnetic susceptibilities of 2-hydroxynaphthaldehyde-(1)-[2-hydroxyanil] Cu(II), 5-nitrosalicylalanthranilic acid Cu(II), 5-bromosalicylalanthranilic acid Cu(II), 2-hydroxyformazylbenzene Cu(II), and 2-oarboxyformazylbenzene Cu(II), as well as their monopyridino-compounds, have been measured by the Gouy method at 25 �C. From the data of magnetic susceptibility, the effective magnetic moments were calculated per one copper atom in these chelates. Some of the pyridine-free complexes show magnetic moments that are smaller than the theoretical moment, 1.73 B.M., for one odd electron, while others have normal magnetic moments. Taking into account four other tri-coordinated copper chelates reported in a preceding paper, two alternative suggestions were made as follows. First, the subnormal moments resulting from the close distance of approach of two copper atoms in dimer molecules can be correlated with the planar configuration of chelate rings involving a copper atom. On the other hand, when a three-dimensional ring exists, the approach of two copper atoms to such a small distance as to cause an appreciable exchange effect is hindered by steric effects, resulting in the normal magnetic moment for this type of tri-coordinated complexes. Secondly, those pyridine-free tri-coordinated copper complexes showing normal moments have a carbonyl group, the oxygen atom of which may take part in the coordination about a copper atom.

scholarly journals Preparation and Spectral Study of New Complexes of Some Metal Ions with 3,5-Dimethyl-1H-Pyrazol-1-yl Phenyl Methanone

2011 ◽  
Vol 8 (4) ◽  
pp. 1005-1011
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Molar Conductivity ◽  
The Other ◽  
Octahedral Structure ◽  
Tetrahedral Structure ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Many complexes of 3,5-dimethyl-1H-pyrazol-1-yl phenyl methanone with Cr(III), Co(II), Ni(II), Cu(II) and Cd(II) were synthesized and characterized by FT-IR, UV/visible spectra, elemental analysis, room temperature magnetic susceptibility and molar conductivity. Cd(II) complex was expected to have tetrahedral structure while all the other complexes were expected to have an octahedral structure.

One-dimensional phthalocyanine-based conductor with S = 3/2 isotropic magnetic centers

2014 ◽  
Vol 18 (08n09) ◽  
pp. 814-823 ◽  
Author(s):  
Yusuke Takita ◽  
Hiroyuki Hasegawa ◽  
Yukihiro Takahashi ◽  
Jun Harada ◽  
Akinori Kanda ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Room Temperature ◽  
Magnetic Moments ◽  
Antiferromagnetic Interaction ◽  
Magnetoresistance Effect ◽  
Conduction Path ◽  
Local Moments ◽  
One Dimensional ◽  
Cr System

The axially ligated phthalocyanine conductor of TPP [ Cr ( Pc )( CN )2]2 (TPP = tetraphenylphosphonium and Pc = phthalocyaninato) with d3 (S = 3/2) metal Cr III has been successfully prepared. The crystal is completely isomorphous with those of the Co and Fe analogs, and the degree of π–π interaction is almost the same in these three salts. The electrical conductivity at room temperature of the Cr system is almost the same with that of the Fe system in which S = 1/2 magnetic centers embedded in the conduction path, and the temperature dependence reveals the development of the charge disproportionation reflecting the existence of magnetic moments. Magnetic susceptibility of the Cr system shows Curie-like behavior with isotropic local moments of S = 3/2. In contrast with the Fe system, only weak antiferromagnetic interaction operates between the localized d-spins. The resistance decreases when magnetic fields are applied, but the magnetoresistance effect is not so large compared with the Fe system, indicating that the π– d interaction in the Cr system is somewhat different from that in the Fe system.

Magnetism, electronic spectra, and structure of transition metal alkoxides. II. The preparation and magnetism of iron(III) alkoxides

1966 ◽  
Vol 19 (3) ◽  
pp. 363 ◽  
Author(s):  
RW Adams ◽  
RL Martin ◽  
G Winter
Keyword(s):  
Room Temperature ◽  
Benzene Solution ◽  
Magnetic Moments ◽  
Exchange Interactions ◽  
Metal Alkoxides ◽  
Antiferromagnetic Exchange ◽  
Crystal Data ◽  
Magnetic Susceptibilities ◽  
X Ray ◽  
The Core

The iron(III) alkoxides, Fe(OMe)3, Fe(OEt)3, and Fe(Obun)a have been prepared by a procedure alternative to those previously described in the literature. The trimeric nature of the three compounds in benzene is confirmed by cryoscopy, and preliminary X-ray single crystal data for the ethoxide are consistent with trimeric entities in the solid. The temperature variation of the magnetic susceptibilities for the three compounds follows the Curie-Weiss law between 90 and 300�K but with large values of θ=- 200�K. The unusually low magnetic moments vary markedly with temperature, and at room temperature remain depressed in benzene solution at peer μeff 4.4 B.M. This anomalous behaviour is ascribed to the presence of weak antiferromagnetic exchange interactions within the cluster of iron atoms which forms the core of the trimeric species Fe3(0R)9. The compounds are sensitive both to hydrolysis and to heating. Hydrolysis decreases and pyrolysis increases the magnetic susceptibility. This provides a convenient method for following the progress of both types of reaction.

scholarly journals The study of the magnetic properties of matter strong magnetic fields.—I.—The balance and its properties

1931 ◽  
Vol 131 (816) ◽  
pp. 224-243 ◽  
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Fields ◽  
Room Temperature ◽  
Direct Method ◽  
Magnetic Moments ◽  
Zeeman Effect ◽  
Inhomogeneous Magnetic Field ◽  
Present Communication ◽  
Strong Magnetic Fields ◽  
Short Times

In several previous communications the author has described a method by which magnetic fields up to 300,000 gauss could be obtained for a duration of time of the order of 1/100 of a second. It was shown that these magnetic fields, in spite of the shortness of their duration, can be applied to the study of different phenomena such as the change of resistance, the Zeeman effect, and others. The present paper describes a number of investigations which have been made on different substances, extending the application of intense magnetic fields to the study of magnetic susceptibility and magnetostriction. The interest in measuring the susceptibility of different substances in strong magnetic fields lies mainly in seeing whether the linear law of magnetisation for ordinary para- and diamagnetic substances holds for higher fields, and also in the investigation of the saturation of paramagnetic bodies at low temperatures, with a view to determining the elementary magnetic moments. In the present communication a method of measuring the magnetic susceptibility is described and experimental results are given which verify the linear law of magnetisation for several paramagnetic and diamagnetic substances. The saturation of iron and nickel in strong fields is also studied. As will be seen later, the possibility of making these measurements in such a small fraction of time results from the increased magnitude of the phenomenon itself. The most direct method for measuring the magnetic susceptibility is to record the force on a magnetised body in an inhomogeneous magnetic field. In the usual experiments at room temperature this force is only a few hundred dynes, but when fields reach the magnitude of 300 kilogauss the force becomes several grams, and is then sufficiently large to be measured with fair accuracy even in short times of the order of 1/100 of a second. In this paper a special type of balance will be described by which these measurements are made possible.

Exchange interactions in antiferromagnetic salts of iridium II. Magnetic susceptibility measurements

1959 ◽  
Vol 250 (1260) ◽  
pp. 97-109 ◽  
Keyword(s):  
Magnetic Susceptibility ◽  
Exchange Interaction ◽  
Ammonium Salt ◽  
Potassium Salt ◽  
Room Temperature ◽  
Exchange Interactions ◽  
Nearest Neighbour ◽  
Paramagnetic Resonance ◽  
Magnetic Susceptibilities ◽  
Isotropic Exchange

Measurements have been made of the magnetic susceptibilities of ammonium and potassium chloroiridates at temperatures between room temperature and 1°K. The results obtained at high temperatures have been analysed into a susceptibility following a Curie-Weiss law together with temperature-independent terms. The values of the isotropic exchange inter­actions between neighbouring iridium ions deduced from the Weiss constant agree well with those calculated from paramagnetic resonance measurements. At lower temperatures the magnetic susceptibilities become almost independent of temperature over a certain range and then fall sharply at the antiferromagnetic transtion points (2.16 °K for the ammonium salt, 3.08°K for the potassium salt). These results are discussed in term s of the exchange interaction between nearest- and next-nearest-neighbour iridium ions.

Dithiochelates of the biscyclopentadienylvanadium(IV) moiety. I. Biscyclopentadienylvanadium(IV) xanthates

1972 ◽  
Vol 25 (10) ◽  
pp. 2085 ◽  
Author(s):  
AT Casey ◽  
JR Thackeray
Keyword(s):  
Magnetic Susceptibility ◽  
Room Temperature ◽  
Magnetic Moments ◽  
Aqueous Media ◽  
Crystalline Solids

The first xanthates of vanadium(1V) to be isolated have been prepared in aqueous media from op2VClz and NaS2COR (R = CH3, C2H5, i-C3H7, C4H9, and C6H11). The purple crystalline solids are monomeric 1 : 1 electrolytes in solution and believed to be of the form (see diagram in text) Room temperature magnetic moments are c.1.65 B.M. and the magnetic susceptibility follows the Curie law. Infrared, electronic, and e.s.r. spectra are reported.

MAGNETIC SUSCEPTIBILITY MEASUREMENTS IN MINNESOTA PART II: ANALYSIS OF FIELD RESULTS

Geophysics ◽  
1953 ◽  
Vol 18 (2) ◽  
pp. 383-393 ◽  
Author(s):  
Harold M. Mooney ◽  
Rodney Bleifuss
Keyword(s):  
Magnetic Susceptibility ◽  
Chemical Analysis ◽  
Magnetic Separation ◽  
The Other ◽  
Volume Percent ◽  
Rock Types ◽  
Magnetite Content

75 samples of 7 rock types have been analyzed for magnetite content by magnetic separation and chemical analysis, making allowance for iron which occurs as ilmenite, hematite, and silicates. Magnetic susceptibility shows a clear dependence on magnetite content but with too much scatter to permit prediction of one from the other. For small magnetite content V (in volume percent), susceptibility k is roughly given by [Formula: see text] cgs. Based on 200 outcrops of 11 rock types, the approximate mean susceptibility of basalt and diabase is [Formula: see text], of rhyolite and gabbro [Formula: see text], of acid intrusives including granite [Formula: see text], of greenstone [Formula: see text], and of slates [Formula: see text]. Variability is high for acid intrusives, intermediate for basalt, rhyolite, and greenstone, and lower for diabase, gabbro, and slate.

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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