Magnetic studies on μ4-oxo-hexa-μ-chlorotetrakis [(pyridine) - copper (II)]

Drake, Robert F.; Crawford, Van H.; Hatfield, William E.

doi:10.1063/1.1680934

Cited by 20 publications

(10 citation statements)

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“…The clusters [Cu 4 OX 6 (TPPO) 4 ] showed the metal ions to be in a tetrahedral arrangement, bridged over the edges by chloride ions and by an oxygen atom in the center of the tetrahedron, while the triphenylphosphine oxide ligands (TPPO) complete the distorted trigonal bipyramidal coordination around the copper atoms − Several of these have been studied from a magnetostructural point of view, since a notable feature of the magnetic susceptibility data for some of these copper(II) tetramers has been the occurrence of a maximum in the temperature dependence of the magnetic moment …”

Section: Introductionmentioning

confidence: 99%

Magnetostructural Characterization of μ₄-Oxohexa-μ₂-chlorotetrakis(imidazole)copper(II)

et al. 1999

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The [Cu4OCl6(IMIDH)4] complex has been synthesized and its crystal structure and magnetic properties determined. The compound crystallizes as a dark green solid in the orthorhombic system, space group P212121, with cell constants a = 11.469(2) Å, b = 13.933(2) Å, c = 16.778(3) Å and four formula units per cell. The complex has a tetrameric structure of four copper(II) ions connected to a central oxo group, in an approximately tetrahedral arrangement. Copper coordination is completed by three μ2-chloride ions and an imidazole nitrogen atom, defining a trigonal bipyramidal environment around each copper ion. A new Heisenberg exchange scheme has been developed, considering the experimentally observed distortion of the Cu4 tetrahedron. The magnetic susceptibilities measurements were interpreted by means of this model, in terms of three coupling constants, J = −7.65 cm-1, J S = 83.3 cm-1, and J L = −58.8 cm-1, which show a linear correlation with the observed Cu−O−Cu angles.

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Section: Introductionmentioning

confidence: 99%

Magnetostructural Characterization of μ₄-Oxohexa-μ₂-chlorotetrakis(imidazole)copper(II)

et al. 1999

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“…Plots of magnetic susceptibility χ m and χ m T product vs T ( χ m is the molar magnetic susceptibility for five Cu II ions) are given in Figure . The magnetic susceptibility of 2 increases with cooling, together with a simultaneous systematic increase in χ m T from 1.93 cm 3 K mol –1 (3.93 μ B ) at 300 K to 2.62 cm 3 K mol –1 (4.58 μ B ) at 1.8 K. Following prior data on Cu II tetramers with the general formula Cu 4 OX 6 L 4 (X = halogen, L = ligand), − the μ eff vs T pattern allowed the classification of such compounds into two groups: (i) those that exhibit increasing μ eff with decreasing temperature − and a maximum followed by a rapid decrease as the temperature is lowered further and (ii) those for which μ eff continuously decreases on lowering the temperature. The increase in χ m T ( μ eff ) upon cooling indicates that the interactions between the copper(II) ions are ferromagnetic.…”

Section: Resultsmentioning

confidence: 98%

A 3D MOF based on Adamantoid Tetracopper(II) and Aminophosphine Oxide Cages: Structural Features and Magnetic and Catalytic Properties

et al. 2021

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This work describes an unexpected generation of a new 3D metal–organic framework (MOF), [Cu 4 (μ-Cl) 6 (μ 4 -O)Cu(OH) 2 (μ-PTA=O) 4 ] n ·2 n Cl-EtOH·2.5 n H 2 O, from copper(II) chloride and 1,3,5-triaza-7-phosphaadamantane 7-oxide (PTA=O). The obtained product is composed of diamandoid tetracopper(II) [Cu 4 (μ-Cl) 6 (μ 4 -O)] cages and monocopper(II) [Cu(OH) 2 ] units that are assembled, via the diamandoid μ-PTA=O linkers, into an intricate 3D net with an nbo topology. Magnetic susceptibility measurements on this MOF in the temperature range of 1.8–300 K reveal a ferromagnetic interaction ( J = +20 cm –1 ) between the neighboring copper(II) ions. Single-point DFT calculations disclose a strong delocalization of the spin density over the tetranuclear unit. The magnitude of exchange coupling, predicted from the broken-symmetry DFT studies, is in good agreement with the experimental data. This copper(II) compound also acts as an active catalyst for the mild oxidation and carboxylation of alkanes. The present study provides a unique example of an MOF that is assembled from two different types of adamantoid Cu 4 and PTA=O cages, thus contributing to widening a diversity of functional metal–organic frameworks.

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“…The tetrameric copper complexes have been classified in three classes in relation to the existence of a maximum in the temperature dependence of the effective magnetic moment [14,15]. In class I, the magnetic moments decrease monotonically with decreasing temperature, and in class II and class III, the magnetic moment passes through a maximum and then decreases at lower temperatures.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Properties and Antibacterial Activity of Tetranuclear Copper Complexes Bridged by Oxo Group

Cortés

Atria

Contreras

et al. 2006

J. Chil. Chem. Soc.

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A series of three tetranuclear Cu(II) complexes of general formula [Cu 4 OCl 6 L 4 ], where L is a Lewis Base ligand has been characterized through magnetic measurements and determination of antimicrobial activities. This study include the following species [Cu 4 OCl 6)Cl(PhIm) 3 ](HPhIm)•H 2 O (1) where PhIm= 4-phenylimidazole, [(Cu 4 OCl 6)(PyNO) 4 ]• 1 / 5 (H 2 O) (2) where PyNO= Pyridine-N-oxide and [(Cu 4 OCl 6)(MeIm) 4 ]•3(CH 3 OH) (3) where MeIm = 2-methylimidazole. The polynuclear cluster in the complexes contains a central oxygen atom tetrahedral coordinated to four copper(II) ions, each of which coordinates a monodentate L ligand. Each pair of copper atoms is bridged by on a chlorine ion, resulting a trigonal bipiramidal environment. The variable temperature magnetic susceptibilities of these complexes were investigated in the temperature range 5-300K. Satisfactory fits to the observed susceptibility data were obtained only for the complexes (1) and (3), by assuming isotropic magnetic exchange interactions and using the appropriate spin Hamiltonian and susceptibility equation giving the coupling constants J 1 = 0.148cm-1 , J 2 =-1.707 cm-1 for (1) and J 1 = 0.522 cm-1 , J 2 =-5.32 cm-1 for (3). The antimicrobial activities of these complexes have been screened in vitro against Gram positive and negative bacteria.

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Magnetic studies on μ4-oxo-hexa-μ-chlorotetrakis [(pyridine) - copper (II)]

Abstract: Articles you may be interested in X-ray μ-Laue diffraction analysis of Cu through-silicon vias: A two-dimensional and three-dimensional study

Cited by 20 publications

References 16 publications

Magnetostructural Characterization of μ₄-Oxohexa-μ₂-chlorotetrakis(imidazole)copper(II)

Magnetostructural Characterization of μ₄-Oxohexa-μ₂-chlorotetrakis(imidazole)copper(II)

A 3D MOF based on Adamantoid Tetracopper(II) and Aminophosphine Oxide Cages: Structural Features and Magnetic and Catalytic Properties

Magnetic Properties and Antibacterial Activity of Tetranuclear Copper Complexes Bridged by Oxo Group

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Magnetic studies on μ4-oxo-hexa-μ-chlorotetrakis [(pyridine) - copper (II)]

Abstract: Articles you may be interested in X-ray μ-Laue diffraction analysis of Cu through-silicon vias: A two-dimensional and three-dimensional study

Cited by 20 publications

References 16 publications

Magnetostructural Characterization of μ4-Oxohexa-μ2-chlorotetrakis(imidazole)copper(II)

Magnetostructural Characterization of μ4-Oxohexa-μ2-chlorotetrakis(imidazole)copper(II)

A 3D MOF based on Adamantoid Tetracopper(II) and Aminophosphine Oxide Cages: Structural Features and Magnetic and Catalytic Properties

Magnetic Properties and Antibacterial Activity of Tetranuclear Copper Complexes Bridged by Oxo Group

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Magnetostructural Characterization of μ₄-Oxohexa-μ₂-chlorotetrakis(imidazole)copper(II)

Magnetostructural Characterization of μ₄-Oxohexa-μ₂-chlorotetrakis(imidazole)copper(II)