Crystal Structures and Magnetic Properties of (2,2'-Dipyridyl)-(3-methoxysalicylaldiminato)copper(II) Perchlorate and (2,2'-Dipyridyl)-(4-methoxysalicylaldiminato)copper(II) Perchlorate

2002 ◽  
Vol 57 (5) ◽  
pp. 519-523 ◽  
Author(s):  
Y. Elerman ◽  
A. Elmali ◽  
I. Svoboda
Keyword(s):  
Magnetic Properties ◽  
Crystal Structures ◽  
Effective Magnetic Moment ◽  
Variable Temperature ◽  
Mixed Ligand ◽  
Dinuclear Complexes ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Dimeric Unit

The mixed-ligand dinuclear complexes (2,2'-dipyridyl)-(3-methoxysalicylaldiminato)copper( II) perchlorate (1) and (2,2'-dipyridyl)-(4-methoxysalicylaldiminato)copper(II) perchlorate (2)were synthesized and their crystal structures determined. Both structures consist of a dimeric unit involving a planar Cu2O2 group. In both structures, the coordination sphere of the Cu atoms can be described as an elongated octahedron where the basal plane is formed by the twoN atoms of the 2,2'-dipyridyl molecule and the two O atoms of the salicylaldehyde anion. The phenoxo O atom is the negative ligand of the monomeric unit. Two apical Cu-O contacts complete the 4+2 coordination of the Cu atoms. They correspond to one of the O atoms of the perchlorate anion and to the O atom of the nearest salicylaldehyde molecule. Variable-temperature magnetic susceptibility data obey the Curie-Weiss law with Θ = -10.3(2) K for 1 and -10.1(2) K for 2. The decrease of the effective magnetic moment from 1.89(7) μB at 300 K to 1.77(7) μB at 70 K for 1 and from 1.88(8) μB at 300 K to 1.76(8) μB at 70 K for 2 and the negative Weiss constants indicate weak antiferromagnetic interactions between the two copper atoms in the dimeric units.

Crystal Structure and Magnetic Properties of (2,2'-Dipyridyl)-(2-acetylphenolato)copper(II) Perchlorate

2002 ◽  
Vol 57 (10) ◽  
pp. 1129-1132 ◽  
Author(s):  
A. Elmali ◽  
Y. Elerman ◽  
I. Svoboda
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Moment ◽  
Basal Plane ◽  
Effective Magnetic Moment ◽  
Mixed Ligand ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Dimeric Unit

The mixed-ligand dinuclear complex (2,2'-dipyridyl)-(2-acetylphenolato)copper(II) perchlorate was synthesized and its crystal structures determined. The structure consists of a dimeric unit involving a planar Cu2O2 group. The coordination sphere of the Cu atom can be described as an alongated octahedron where the basal plane is formed by the two N atoms of the 2,2'-dipyridyl molecule and the two O atoms of the acetophenon anion. Two apical Cu - O contacts complete the 4+2 coordination of the Cu atoms. They correspond to one of the O atoms of the perchlorate anion and to the O atom of the second unit. Magnetic susceptibility data obey the Curie-Weiss law with θ = -8.1(2) K. The decreasing of the effective magnetic moment from 1.94(8) μB at 300 K to 1.86(8) μB at 70 K and the negative Weiss constant indicate weak antiferromagnetic interactions between the two copper atoms in the dimeric units.

New Copper(II) and Nickel(II) Complexes with Bifunctional Tetrazolate-5-carboxylate Ligands: Syntheses, Crystal Structures, and Magnetic Properties

2009 ◽  
Vol 62 (12) ◽  
pp. 1622 ◽  
Author(s):  
A-Qing Wu ◽  
Qi-Yong Chen ◽  
Mei-Feng Wu ◽  
Fa-Kun Zheng ◽  
Feng Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Variable Temperature ◽  
Supramolecular Network ◽  
X Ray Diffraction ◽  
Carboxylate Ligands ◽  
Magnetic Susceptibility Data ◽  
X Ray ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Network Variable

Four new complexes with bifunctional tetrazolate-5-carboxylate ligands of 1H-tetrazole-5-formic acid (H2tzf) and 1H-tetrazole-5-acetic acid (H2tza), namely two dinuclear [M(tzf)(H2O)3]2·2H2O (M = Cu 1, Ni 2) and two mononuclear [Cu(tzf)(2,2′-bipy)2]·5H2O 3 and Cu(tza)(2,2′-bipy)H2O 4, were prepared and structurally characterized by single-crystal X-ray diffraction. Two different coordination modes of tetrazolate-5-carboxylate ligands exist: a tridentate N,O-chelated-N-bridged mode in 1 and 2, and a bidentate N,O-chelated mode in 3 and 4, which was first observed for the tetrazolate-5-carboxylate complexes. Extensive hydrogen bonds play an important role in the construction of the supramolecular network. Variable-temperature magnetic susceptibility data show the presence of antiferromagnetic interactions in 1 and 2. The thermogravimetric analyses of complexes 1–4 are also discussed.

Synthesis, structure and magnetic properties of a binuclear copper(II) complex constructed by a new coordination mode of the tetrachlorophthalate ligand

2016 ◽  
Vol 71 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Jun Zhang ◽  
Jun-Xia Li
Keyword(s):  
Binuclear Complex ◽  
Coordination Mode ◽  
Variable Temperature ◽  
The Other ◽  
Antiferromagnetic Coupling ◽  
Binuclear Copper ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Binuclear Structure

AbstractA binuclear complex [Cu2(tcpa)2(bipy)2(H2O)3] (1) (H4tcpa = tetrachlorophthalic acid, bipy = 2,2′-bipyridine) has been synthesized and structurally characterized. Two independent CuII centers Cu1 and Cu2 are both five-coordinated in distorted square pyramids. The tetrachlorophthalate (tcpa2–) anions show a new coordination mode: one is monodentate at Cu1, and the other displays a bridging μ2-O,O″ fashion linking Cu1 and Cu2, thus forming the binuclear structure of 1. Variable-temperature magnetic susceptibility data show weak antiferromagnetic coupling between the two CuII ions.

Solid State Coordination Chemistry of Pyridinedicarboxylic Acid Isomers. I Copper(II) Disodium Bis(pyridine-2,3- dicarboxylate) Octahydrate and Copper(II) Pyridine-3,4-dicarboxylate 3·5 Hydrate

1999 ◽  
Vol 52 (3) ◽  
pp. 205 ◽  
Author(s):  
Elsa E. Sileo ◽  
Daniel Vega ◽  
Mará T. Garland ◽  
Ricardo Baggio ◽  
Miguel A. Blesa
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Crystal Structures ◽  
Monoclinic Space Group ◽  
Thermal Dependence ◽  
Magnetic Susceptibility Data ◽  
Space Group ◽  
Susceptibility Data ◽  
Pyridinedicarboxylic Acid ◽  
State Coordination

The crystal structures of Na2Cu(2,3-pydc)2.8H2O (1) and Cu(3,4-pydc).3·5H2O (2) (pydc = pyridinedi- carboxylato) are presented. Compound (1) is monoclinic, space group C 2/c, with a 21·274(1), b 6 ·114(1), c 17·136(1) Å, β 101·62(1)°, Z 4, Dc 1·776 g cm-3 ; compound (2) is also monoclinic, space group P 21/c, with a 7·272(2), b 11·319(3), c 25·453(9) Å, β 90·58(1)°, Z 4, Dc 1·850 g cm-3 . Their stereochemistries are analysed, and compared with other copper(II) pyridine-2,6-dicarboxylates. Ligand constraints are shown to determine the crystal structures and the magnetic properties. Thermal dependence of magnetic susceptibility data and t.g., d.t.g. and d.t.a. measurements are also presented.

Manganese(II) Oxazolidine Nitroxide Chelates: Structure, Magnetism, and Redox Properties

2014 ◽  
Vol 67 (11) ◽  
pp. 1618 ◽  
Author(s):  
Ian A. Gass ◽  
Mousa Asadi ◽  
David W. Lupton ◽  
Boujemaa Moubaraki ◽  
Alan M. Bond ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Intramolecular Interaction ◽  
Variable Temperature ◽  
Field Measurements ◽  
X Ray Diffraction ◽  
Magnetic Susceptibility Data ◽  
X Ray ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Radical Interaction

The mononuclear oxazolidine nitroxide complex [MnII(L•)2](ClO4)2 (1) (L•, 4-dimethyl-2,2-di(2-pyridyl)oxazolidine N-oxide) has been synthesized and investigated using single-crystal X-ray diffraction, variable-temperature magnetic susceptibility measurements, and electrochemistry. The structural analysis reveals bond lengths compatible with a linear L•–MnII–L• arrangement where the ligands are in the neutral ligand form and the central MnII ion is high spin (S = 5/2). Although analysis of the variable-temperature magnetic susceptibility data suggests a strong antiferromagnetic metal–radical interaction, the radical–radical intramolecular interaction could not be determined unambiguously from such fits. The resultant isolated S = 3/2 ground state is confirmed by low-temperature magnetization versus field measurements. Electrochemical studies reveal similar square schemes and redox intermediates to the previously reported analogues [FeII(L•)2][BF4]2 and [CoII(L•)2][NO3]2.

Syntheses, crystal structures, and magnetism of one-dimensional complexes generated from copper(II) and carbamyldicyanomethanide bridging ligand

2004 ◽  
Vol 82 (3) ◽  
pp. 483-489 ◽  
Author(s):  
Jing-Min Shi ◽  
Qing-Yun Liu ◽  
Wen Xu ◽  
Lin Meng ◽  
Peng Cheng ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Variable Temperature ◽  
Ligand Complex ◽  
Bridging Ligands ◽  
Magnetic Susceptibility Data ◽  
One Dimensional ◽  
X Ray Crystallography ◽  
Susceptibility Data ◽  
Bridging Ligand ◽  
Chain Complexes

Two one-dimensional chain complexes, {[Cu(cda)2H2O]·H2O}n (1) and {[Cu(cda)(H2O)2]·(ClO4)·3H2O}n (2) (cda = carbamyldicyanomethanide anion) have been synthesized and their crystal structures determined by X-ray crystallography. The copper(II) ions in 1 are bridged by two µ1,5-cda bridging ligands, whereas in 2 the copper(II) ions are connected by a single µ1,5-cda ligand. Complex 1 is red while 2 is green. Variable-temperature magnetic susceptibility data indicate that there is a very weak antiferromagnetic interaction between the bridged copper(II) ions in both 1 and 2.Key words: synthesis, crystal structure, copper complex, polynitrile ligand, magnetism.

scholarly journals Synthesis, Crystal Structures and Magnetic Properties of Mixed-Valent Tetranuclear Complexes with Y-Shaped MnII2MnIII2 Core

2019 ◽  
Vol 5 (1) ◽  
pp. 8 ◽  
Author(s):  
Masahiro Mikuriya ◽  
Satoshi Kurahashi ◽  
Seiki Tomohara ◽  
Yoshiki Koyama ◽  
Daisuke Yoshioka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Crystal Structures ◽  
Variable Temperature ◽  
Magnetic Interactions ◽  
Magnetic Data ◽  
Schiff Base Ligands ◽  
Tetranuclear Cluster ◽  
Variable Temperature Magnetic Susceptibility ◽  
Tetranuclear Complexes

Tetranuclear MnII2MnIII2 complexes with 1,3-bis(5-bromo-3-metoxysalicylidenaminomethyl)-2-propanol (H3bmsap) and 1,3-bis(5-chloro-3-methoxysalicylidenaminomethyl)-2-propanol (H3cmsap), [Mn4(bmsap)2(CH3CO2)3(CH3O)] (3) and [Mn4(cmsap)2(CH3CO2)3(CH3O)] (4), were synthesized and characterized by elemental analysis, infrared and diffused reflectance spectra and variable-temperature magnetic susceptibility measurements in the 2–300 K range. The crystal structures of 3 and 4 revealed a Y-shaped tetranuclear manganese cluster formed by the two Schiff-base ligands, three kinds of acetato ligands (bidentate, syn–anti-bridging, and syn–syn-bridging), and µ-methoxido ligand. The magnetic data showed the magnetic interactions among the four manganese atoms are antiferromagnetic as a whole within the tetranuclear cluster.

Preparation, electrochemical behavior, and variable-temperature magnetic properties of Co(3,5-DBSQ)2 complexes of imidazole- or pyrazole-substituted ligands

2015 ◽  
Vol 93 (7) ◽  
pp. 769-774 ◽  
Author(s):  
Carolyn Dowling ◽  
Danielle R. Dinsdale ◽  
Martin T. Lemaire
Keyword(s):  
Magnetic Susceptibility ◽  
High Spin ◽  
Density Functional ◽  
Variable Temperature ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Magnetic Susceptibility Data ◽  
Valence Tautomerism ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility

Herein we describe the preparation of four new Co(3,5-DBSQ)2 containing known 2-(2-pyridyl)benzimidazole 1, 2,2′-bisbenzimidazole 2, or 2,2-(1H-pyrazole-3,5-diyl)dipyridine 3. We investigate the electronic and variable-temperature magnetic susceptibility properties of these complexes. Complexes containing 2 and 3 are bimetallic and variable-temperature magnetic susceptibility data suggest observation of a stable intermediate (high-spin and low-spin) state for the bimetallic complex with 3, which does undergo valence tautomerism. Complexes 4–6 containing imidazole-based ligands 1 and 2 feature high-spin ground states and no valence tautomerism is observed in these materials. This experimental finding is corroborated with density functional theory calculations, which support the existence of a stable high-spin ground state in these complexes.

A new binuclear NiII complex with tetrafluorophthalate and 2,2′-bipyridine ligands: synthesis, crystal structure and magnetic properties

2019 ◽  
Vol 74 (11-12) ◽  
pp. 833-838 ◽  
Author(s):  
Jun-Xia Li ◽  
Zhong-Xiang Du ◽  
Xun Feng
Keyword(s):  
Variable Temperature ◽  
Ferromagnetic Coupling ◽  
X Ray Diffraction ◽  
Magnetic Susceptibility Data ◽  
X Ray ◽  
Susceptibility Data ◽  
Variable Temperature Magnetic Susceptibility ◽  
Niii Complex ◽  
Weak Ferromagnetic ◽  
Dinuclear Structure

AbstractA new NiII compound, [Ni2(tfpa)2(bipy)2(H2O)4] (1) with tetrafluorophthalate (tfpa2−) and 2,2′-bipyridine (abbreviated as bipy) ligands, has been synthesized and structurally characterized. The single-crystal X-ray diffraction analysis reveals that the tfpa2− anions act as bis-monodentate linkers connecting NiII centers to form the dinuclear structure of 1. The dimeric units are stabilized by intramolecular π–π stacking and are further connected into a layer through O–HLO hydrogen bonding. Variable-temperature magnetic susceptibility data in the 10–200 K temperature range indicate weak ferromagnetic coupling between the two NiII ions.

Magnetic Properties of Liquid Crystals Incorporating Metal Centres

1989 ◽  
Vol 175 ◽  
Author(s):  
Wolfgang Haase ◽  
Stefan Gehring ◽  
Bettina Borchers
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Liquid Crystals ◽  
Molecular Interactions ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Magnetic Effects ◽  
Diamagnetic Anisotropy

AbstractMagnetic susceptibility data (300–520 K) of monomeric and dimeric mesogenic copper(II) compounds are presented. Different magnetic effects arising from the paramagnetic Cu(II)-centres and the diamagnetic anisotropy of the mesogenic groups are observed and discussed with respect to possible inter molecular interactions.

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