Ferromagnetic interactions mediated by syn–anti carboxylate bridging in tetranuclear copper(II) compounds

Murugesu, Muralee; Clérac, Rodolphe; Pilawa, B.; Mandel, Alexander; Anson, Christopher E.; Powell, Annie K.

doi:10.1016/s0020-1693(02)01083-6

Cited by 66 publications

(35 citation statements)

References 30 publications

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“…The equatorial plane around central Cu2 is nearly perpendicular to the basal plane of the two terminal Cu(II) ions, which provides a favorable orientation for the orthogonality of the magnetic orbitals, thus causes a dominant ferromagnetic interaction. The value of the magnetic coupling is within those observed in the copper complexes [12,14,15] with bridging syn-anti carboxylate groups (0.37-12.4 cm À1 ).…”

supporting

confidence: 77%

Ferromagnetic linear trinuclear copper (II) complex bridged by sulfosalicylate ligand

Wang

Zhang

Song

et al. 2004

Inorganic Chemistry Communications

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supporting

confidence: 77%

Ferromagnetic linear trinuclear copper (II) complex bridged by sulfosalicylate ligand

Wang

Zhang

Song

et al. 2004

Inorganic Chemistry Communications

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“…[28] But for the hexanuclear Cu II complexes with amino acids, the coordination geometry around each equatorial Cu II ion is an elongated octahedron, the Cu II ions, which provides a favorable orientation for the orthogonality of the magnetic orbitals, thus causing a dominant ferromagnetic interaction. The values of the magnetic coupling for these amino acid compounds are within those observed in the copper complexes [26,29,30] with bridging syn-anti carboxylate groups (0.37-14 cm -1 ).…”

Section: Dft Studiessupporting

confidence: 70%

A New Spherical Metallacryptate Compound [Na{Cu₆(Thr)₈(H₂O)₂(ClO₄)₄}]·ClO₄·5 H₂O: Magnetic Properties and DFT Calculations

Xiang

Zhang

et al. 2005

Eur J Inorg Chem

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Keywords: Spherical metallacryptate / Magnetic properties / Density functional calculations / Broken symmetry / ThreonineThe hexanuclear copper(II) complex with threoninato acid has been synthesized. Its structure can be described as an octahedron cage with D 2h symmetry in which six copper ions are bound by eight threoninato acids with a [3.1 1 2 23 1 3 0] coordination mode and one Na + cation being captured within the center of the cage. In contrast with other hexanuclear copper compounds containing amino acids, the title compound has a prolate Cu 6 octahedron with the longest axial distance and a rectangle equatorial plane, as well as special coordinated perchlorate ions. Compared with classic cryptate, hexanuclear copper(II) compounds with amino acids can be regarded as a new topologic type of spherical macrotricyclic metallacryptates [2,2,2,2] whose cages have a high selectivity for sodium ions. The analysis of magnetic susceptibility

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“…Design and crystal structural investigations of such supramolecular networks have much interest mostly because of their wide range of varied features and potential applications as magnetic and porous materials. In general, copper(II) carboxylates exhibit a typical dinuclear paddle wheel cage structure, but they can also form polymer chains, as homo-and heterometallic species [10], or even cyclic polynuclear species [11], with peculiar magnetic properties [12,13]. Recently, a copper(II) complex with aspartame was prepared in our laboratories.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure, spectroscopic and electrochemical characterization of the dinuclear complex {tetra-μ-[(±)-2-(p-methoxyphenoxy)-propionato-O,O′]bis(aqua)dicopper(II)}

Cavicchioli

Massabni

Guilherme

et al. 2007

Transition Met Chem

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Structural, electrochemical and spectroscopic data of a new dinuclear copper(II) complex with (±)-2-(p-methoxyphenoxy)propionic acid are reported. The complex {tetra-l-[(±)-2-(p-methoxyphenoxy)propionato-O,O¢]-bis(aqua)dicopper(II)} crystallizes in the monoclinic system, space group P2 1 /n with a = 14.149(1) Å , b = 7.495(1) Å , c = 19.827(1) Å , b = 90.62(1) and Z = 4. X-ray diffraction data show that the two copper(II) ions are held together through four carboxylate bridges, coordinated as equatorial ligands in square pyramidal geometry. The coordination sphere around each copper ion is completed by two water molecules as axial ligands. Thermogravimetric data are consistent with such results. The ligand has an ''L'' type shape due to the angle formed by the b-carbon of the propionic chain and the linked p-methoxyphenoxy group. This conformation contributes to the occurrence of a peculiar structure of the complex. The complex retains its dinuclear nature when dissolved in acetonitrile, but it decomposes into the corresponding mononuclear species if dissolved in ethanol, according to the EPR measurements. Further, cyclic voltammograms of the complex in acetonitrile show that the dinuclear species maintains the same structure, in agreement with the EPR data in this solvent. The voltammogram shows two irreversible reduction waves at E pc = )0.73 and )1.04 V vs. Ag/AgCl assigned to the Cu(II)/Cu(I) and Cu(I)/Cu°redox couples, respectively, and two successive oxidation waves at E pa =) 0.01 and +1.41 V vs. Ag/AgCl, assigned to the Cu°/Cu(I) and Cu(I)/Cu(II) redox couples, respectively, in addition to the oxidation waves of the carboxylate ligand.

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Ferromagnetic interactions mediated by syn–anti carboxylate bridging in tetranuclear copper(II) compounds

Cited by 66 publications

References 30 publications

Ferromagnetic linear trinuclear copper (II) complex bridged by sulfosalicylate ligand

Ferromagnetic linear trinuclear copper (II) complex bridged by sulfosalicylate ligand

A New Spherical Metallacryptate Compound [Na{Cu₆(Thr)₈(H₂O)₂(ClO₄)₄}]·ClO₄·5 H₂O: Magnetic Properties and DFT Calculations

Synthesis, crystal structure, spectroscopic and electrochemical characterization of the dinuclear complex {tetra-μ-[(±)-2-(p-methoxyphenoxy)-propionato-O,O′]bis(aqua)dicopper(II)}

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Ferromagnetic interactions mediated by syn–anti carboxylate bridging in tetranuclear copper(II) compounds

Cited by 66 publications

References 30 publications

Ferromagnetic linear trinuclear copper (II) complex bridged by sulfosalicylate ligand

Ferromagnetic linear trinuclear copper (II) complex bridged by sulfosalicylate ligand

A New Spherical Metallacryptate Compound [Na{Cu6(Thr)8(H2O)2(ClO4)4}]·ClO4·5 H2O: Magnetic Properties and DFT Calculations

Synthesis, crystal structure, spectroscopic and electrochemical characterization of the dinuclear complex {tetra-μ-[(±)-2-(p-methoxyphenoxy)-propionato-O,O′]bis(aqua)dicopper(II)}

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A New Spherical Metallacryptate Compound [Na{Cu₆(Thr)₈(H₂O)₂(ClO₄)₄}]·ClO₄·5 H₂O: Magnetic Properties and DFT Calculations