scholarly journals Synthesis, structure and magnetic properties of tetrakis-μ-carboxylato-bis(dodecylnicotinato)dicopper(II) complexes; crystal and molecular structure of the decyl carboxylate derivative

2000 ◽  
Vol 56 (4) ◽  
pp. 666-672 ◽  
Author(s):  
Marcia Rusjan ◽  
Zulema Chaia ◽  
Oscar E. Piro ◽  
Daniel Guillon ◽  
Fabio D. Cukiernik
Keyword(s):  
Molecular Structure ◽  
Magnetic Properties ◽  
Copper Ions ◽  
Lone Pair ◽  
Magnetic Behavior ◽  
Coupling Constant ◽  
X Ray Diffraction ◽  
Carboxylate Groups ◽  
Lamellar Phases ◽  
Oxygen Lone Pair

Dodecylnicotinate bis-adducts of binuclear copper carboxylates, of the general formula Cu2(O2CC n − 1H2n − 1)4(C5H4NCOOC12H25)2, were synthesized for n = 10, 12, 14, 16, 18 and 20, and their crystal structure, thermal behavior and magnetic properties studied. The molecular structure of the decyl derivative has been determined from single-crystal X-ray diffraction data. The dimer is centrosymmetric with the CuII ions in a square-pyramidal coordination with four O-alkyl O atoms [average d(Cu—O) 1.960 (6) Å] in the basal plane and the nicotine N atom at apical positions [d(Cu—N) 2.183 (3)  Å]. The copper ions, 2.615 (1) Å apart, are bridged by four O-alkyl carboxylate groups. Both the n = 20 and n  =  18 homologues exhibit lamellar phases, which can be related to the supramolecular arrangement found in the n = 10 derivative. The magnetic behavior of the decyl and octadecyl dimers was studied in the 2–300 K temperature range. They exhibit a strong intramolecular antiferromagnetic interaction (Cu–Cu superexchange coupling constant J  = −347 cm−1 for the decyl derivative), which can be attributed to a large overlap of the metal 3d orbitals and the oxygen lone pair orbitals of the linking carboxylate groups.

The Effect of Partial Substitution of Non-Magnetic Impurity Zn on the Magnetic Moments of Eu1.88Ce0.12Cu1-yZnyO4+α-δ

2021 ◽  
Vol 1028 ◽  
pp. 15-20
Author(s):  
Muhammad Abdan Syakuur ◽  
Yati Maryati ◽  
Togar Saragi ◽  
Risdiana
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Impurity ◽  
Magnetic Moments ◽  
Magnetic Behavior ◽  
Partial Substitution ◽  
X Ray Diffraction ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Volume Unit

Structure and magnetic properties of electron-doped superconducting cuprates have been investigated in order to study the effect of magnetic impurity to its physical properties. Here, we reported structure and magnetic properties of Eu1.88Ce0.12Cu1-yZnyO4+α-δ (ECCZO) with y = 0 and 0.03. The properties of ECCZO have been studied from X-ray diffraction data and temperature dependence of magnetic susceptibility data, to elucidate the effect of partial substitution of non-magnetic impurity Zn for Cu to its structure, Tc and the value of magnetic moments per unit volume extracted from susceptibility data in normal state. Magnetic-susceptibility measurements were carried out down to 2 K on-field cooling at 5 Oe for Eu1.88Ce0.12Cu1-yZnyO4+a-d with y = 0 and 0.03. For ECCZO sample with y = 0 and d = 0.0669 indicated the change of magnetic behavior from paramagnetic to diamagnetic below 12 K which is addressed to the Tc onset of this samples. Diamagnetic behavior is observed starting from about 12 K. Above 12 K, all samples show paramagnetic behavior with the values of the magnetic moment in every volume unit increased with increasing Zn.

A quasi-tetrahedral tetracopper cluster with syn-anti bridging carboxylate groups: crystal and molecular structure and magnetic properties

1990 ◽  
Vol 29 (21) ◽  
pp. 4240-4246 ◽  
Author(s):  
Enrique Colacio ◽  
Jean Pierre Costes ◽  
Raikko Kivekas ◽  
Jean Pierre Laurent ◽  
Jose Ruiz
Keyword(s):  
Molecular Structure ◽  
Magnetic Properties ◽  
Crystal And Molecular Structure ◽  
Carboxylate Groups

X-ray diffraction study of copper(I) thiourea complexes formed in sulfate-containing acid solutions

2000 ◽  
Vol 56 (6) ◽  
pp. 993-997 ◽  
Author(s):  
O. E. Piro ◽  
R. C. V. Piatti ◽  
A. E. Bolzán ◽  
R. C. Salvarezza ◽  
A. J. Arvia
Keyword(s):  
Molecular Structure ◽  
Diffraction Study ◽  
Crystal And Molecular Structure ◽  
Copper Ions ◽  
Acid Solutions ◽  
Inversion Center ◽  
Tetrahedral Coordination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thiourea Complex

The formation of three different copper(I) thiourea complexes in sulfate-containing acid solutions was observed. The ratio between CuI and thiourea (tu) in these complexes depends on the amount of thiourea and copper sulfate in the solution. The crystal and molecular structure of a new complex, [Cu_2(tu)_6](SO_4)\cdotH_2O, was determined, and the formation and structures of [Cu_2(tu)_5](SO_4)\cdot3H_2O and [Cu_4(tu)_7](SO_4)_2\cdotH_2O were confirmed. The compound [Cu_2(tu)_6](SO_4)\cdotH_2O crystallizes in the P\overline 1 space group, with a = 11.079 (2), b = 11.262 (1), c = 12.195 (2) Å, \alpha = 64.84 (1), \beta = 76.12 (1), \gamma = 66.06 (1)°, and Z = 2. The Cu-thiourea complex is arranged as a CuI tetranuclear ion, [Cu_4(tu)_{12}]^{4+}, sited on a crystallographic inversion center. All copper ions are in a tetrahedral coordination with thiourea ligands and located at alternate sites on an eight-membered, crown-like ring.

scholarly journals Structural, Spectroscopic, Thermal, and Magnetic Properties of a New Dinuclear Copper Coordination Compound with Tiglic Acid

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2148
Author(s):  
Marcin Świątkowski ◽  
Suneel Lanka ◽  
Agnieszka Czylkowska ◽  
Katarzyna Gas ◽  
Maciej Sawicki
Keyword(s):  
Magnetic Properties ◽  
Coordination Compound ◽  
Copper Ions ◽  
Water Solution ◽  
Antiferromagnetic Coupling ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Tiglic Acid ◽  
Hirshfeld Analysis ◽  
Coordination System

The first coordination compound of copper and tiglic acid named tetrakis(μ-tiglato)bis(tiglic acid)dicopper(II) was synthesized and crystallized from water solution. Its structure was determined and analyzed based on X-ray diffraction measurement. The paddle-wheel coordination system of the investigated compound was compared with other similar copper structures known in the literature. The Hirshfeld analysis was used for the detailed analysis of intermolecular interaction. The new compound was also characterized in terms of infrared absorption, thermal, and magnetic properties. The antiferromagnetic coupling of copper ions was found.

Reaktive E=C (p-p)π-Systeme, XL. / Reactive E=C(p-p)π Systems, XL.

1995 ◽  
Vol 50 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Thomas Albers ◽  
Joseph Grobe ◽  
Duc Le Van ◽  
Bernt Krebs ◽  
Mechtild Läge
Keyword(s):  
Molecular Structure ◽  
Main Product ◽  
Chloroform Solution ◽  
Lone Pair ◽  
Secondary Amines ◽  
Molar Ratio ◽  
Electronic Interaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Compounds

The reaction of bis(trifluoromethyl)arsane 2 with secondary amines R2NH in a molar ratio of 1:3 at -60 °C allows the preparation of trifluoromethyl arsaalkenes of the type F3CAs=C(F)NR2 in moderate yields (15-35%) [NR2 = NMe2 (3a), NMeEt (3b), NEt2 (3c)]. The main product of the reaction of 2 with Me2NH is the 1,1-diamino compound F3CAs=C(NMe2)2 (4a). With ethyl(isopropyl)- or di(isopropyl)amine the corresponding derivatives F3CAs=C(F)NEt(iPr) (3d) and F3CAs=C(F)N(iPr)2 (3e), respectively, are formed only in traces (3d), or not at all (3 e). However, 3d and 3e can be prepared by reacting perfluoro-2-arsapropene with the corresponding secondary amines. The new compounds 3 a to 3 e can be stored at 20 °C in chloroform solution for hours without decomposition and show Z configuration without exception. The molecular structure of 1-(diethylamino)-1,3,3,3-tetrafluoro-2-arsapropene 3c, determined by an X-ray diffraction study on single crystals, indicates a strong electronic interaction of the lone pair on nitrogen with the AsC double bond. This results in a trigonal planar arrangement at the nitrogen atom, a strongly shortened sp2-CN-bond (1.312 Å), an elongated AsC distance (1.867 Å), and an almost planar skeleton of the molecule.

scholarly journals A 3D Silverton-Type Polyoxomolybdate Based on {PrMo12O42}: Synthesis, Structure, Photoluminescence and Magnetic Properties

2021 ◽  
Vol 9 ◽  
Author(s):  
Yanxin Zhao ◽  
Xiaopeng Sun ◽  
Yanfang Ji ◽  
Hui Kong ◽  
Shumin Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Variable Temperature ◽  
Three Dimensional ◽  
Magnetic Behavior ◽  
X Ray Diffraction ◽  
Red Emission ◽  
X Ray ◽  
Variable Temperature Magnetic Susceptibility ◽  
Elemental Analyses ◽  
Inorganic Building Block

A three-dimensional (3D) Silverton-type polyoxomolybdate (POMo) with the formula of NH4{Mn4[PrMo12O42]}·18H2O (1) was successfully isolated and well characterized by single crystal X-ray diffraction, X-ray powder diffraction pattern, infrared spectrum, thermogravimetric and elemental analyses. The inorganic building block {PrMo12O42} has formed 3D frameworks via the {MnO6} linker. The excitation of compound 1 in solid state at 375 nm displays red emission. Moreover, variable temperature magnetic susceptibility measurements indicate that the magnetic behavior in compound 1 is dominated by antiferromagnetic interactions.

scholarly journals Nanostructure-Related Magnetic Properties of Various Mesoporous Cobalt Oxide and Cobalt Ferrite Spinel Phases

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Magnetic Properties ◽  
Cobalt Oxide ◽  
Cobalt Ferrite ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spinel Phases ◽  
Ferrite Spinel

Nanostructure-related magnetic properties are investigated systematically for various mesoporous cobalt oxide (Co3O4) and cobalt ferrite (CoFe2O4) spinel phases. Synthesis of thematerials by nanocasting offers the opportunity to obtain materials which are different from each other with respect to both specific surface area and crystallite size. As a result, the respective contributions of two types of interfaces, namely, “solid–gas” and “solid–solid” interfaces, to the magnetic ordering can be distinguished. Structural characterization of the porous materials by X-ray diffraction, N2 physisorption, and electron microscopy as well as investigation of the magnetic behavior (field-dependent magnetization and temperaturedependentsusceptibility) are presented.

Distorted amides as models for activated peptide N-C=O units. 2. The synthesis, hydrolytic profile, and molecular structure of 3,4-dihydro-2-oxo-1,4-propanoquinoline

1990 ◽  
Vol 68 (10) ◽  
pp. 1732-1739 ◽  
Author(s):  
Qingping Wang ◽  
A. J. Bennet ◽  
R. S. Brown ◽  
B.D. Santarsiero
Keyword(s):  
Molecular Structure ◽  
Rate Constant ◽  
Lone Pair ◽  
Protonated Form ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amide Hydrolysis ◽  
Mechanism Of Hydrolysis

A distorted anilide (3,4-dihydro-2-oxo-1,4-propanoquinoline (3)) has been synthesized, its structure determined by X-ray diffraction, and its hydrolysis profile from pH 0–13 investigated. The amide unit in 3 is distorted in that the N lone pair is twisted 35° and tilted 15° out of optimum conjugation with the C=O II system. Due to this distortion, 3 hydrolyses rapidly in H2O at 25 °C. The pH/rate constant profile exhibits domains consistent with OH− attack on 3[Formula: see text] and H2O attack on a protonated form of 3[Formula: see text]; pKa (3-H+) = 0.56). The kinetic pKa is most consistent with an N-protonated form. It is also shown that this mechanism of hydrolysis is common to the series of bridged anilides consisting of 3, 3,4-dihydro-2-oxo-1,4-ethanoquinoline (1), and 2,3,4,5-tetrahydro-2-oxo-1,5-ethanobenzazepine (2). Keywords: distorted amide, hydrolysis, X-ray structure.

Magnetic Study of Nanoferritas CoFe2O4 Obtained by Reaction of Combustion

2014 ◽  
Vol 798-799 ◽  
pp. 402-406
Author(s):  
Polyana Tarciana Araújo Santos ◽  
Pascally M.A. Guerra de Araújo ◽  
Ana Cristina Figueiredo de Melo Costa ◽  
Daniel R. Cornejo
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
High Intensity ◽  
Magnetic Measurements ◽  
Spinel Ferrite ◽  
Magnetic Behavior ◽  
Ferrite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Peaks

The present work aims to study the magnetic properties of nanoferrita cobalt obtained by combustion reaction. The structural feature as well as the magnetic behavior when in the presence of a magnet and magnetic measurements was investigated. The resulting samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), magnetic behavior when in the presence of a magnet and magnetic measurements. The results indicated the phase single the spinel ferrite CoFe2O4, with high intensity of diffraction peaks indicating that the samples are crystalline and nanoparticle formation. The characteristic bands of spinel were observed for nanoferritas CoFe2O4. The ferrite nanoparticles were strongly attracted when in presence the magnet presenting a saturation magnetization of 58.0 emu/g, coercivity of 1.14 kOe.

Studies of rhenium–carboxylate complexes. III. The crystal and molecular structure of tetra-μ-n-butyratodirhenium(III) diperrhenate

1970 ◽  
Vol 48 (2) ◽  
pp. 219-224 ◽  
Author(s):  
C. Calvo ◽  
N. C. Jayadevan ◽  
C. J. L. Lock ◽  
R. Restivo
Keyword(s):  
Molecular Structure ◽  
Crystal And Molecular Structure ◽  
The Other ◽  
Formula Unit ◽  
X Ray Diffraction ◽  
Rhenium Atom ◽  
X Ray ◽  
3 Dimensional ◽  
Carboxylate Groups ◽  
R Value

One of the compounds obtained by the reaction of rhenium(III) chloride with n-butyric acid while exposed to oxygen has been shown by single crystal X-ray diffraction to be tetra-μ-n-butyratodi-rhenium(III) diperrhenate. The crystals are triclinic with lattice parameters a = 7.836(8) Å, b = 10.746(8) Å, c = 8.773(8) Å, α = 88.9(1)°, β = 106.5(1)°, and γ = 98.0(1)°. The space group is [Formula: see text] and there is one formula unit per cell. A total of 1593 independent reflections were examined and the structure was refined by full 3-dimensional least-squares to an R value of 0.123. Two rhenium environments are found, one consisting of a dimer unit bridged by 4 carboxylate groups and the other a per-rhenate group. This latter group, showing a mean Re—O distance of 1.75 Å, shares an oxygen atom with a rhenium atom in the dimer unit, and this Re—O bond length is 2.18 Å long. The structure results from packing of short chains, consisting of the dimer unit and the 2 perrhenate groups, running roughly parallel to the [111] direction.

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