Magnetic properties and crystal structures of bis(μ-pyrazolato)-bridged dicopper(II,II) complexes with 1,10-phenanthroline or 2,2′-bipyridine

Matsushima, Hideaki; Hamada, Hironobu; Watanabe, Kanna; Koikawa, Masayuki; Tokii, Tadashi

doi:10.1039/a808074g

Cited by 48 publications

(26 citation statements)

References 24 publications

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“…The À2J values are lower than those reported for the analogous diazine-bridged dinuclear copper(II) complexes where the 2J values range from À98 to À545 cm À1 , showing a strong anti-ferromagnetic interaction [6,7,[24][25][26][27][28][29]. Although a wide range of the 2J values (À35 to À1304 cm À1 ) is found for mixed l-diazine with l-OH or l-halogeno bridging dinuclear copper(II) complexes [30][31][32][33], most of them show a strong anti-ferromagnetic interaction through the l-azine-bridge.…”

Section: Magnetic Propertiescontrasting

confidence: 66%

Structural and magnetic characterization of 1-D complexes constructed from pyrazole-3,5-dicarboxylate bridging multi copper(II) centers

Massoud¹,

Louka²,

Nguyen³

et al. 2011

Inorganica Chimica Acta

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Section: Magnetic Propertiescontrasting

confidence: 66%

Structural and magnetic characterization of 1-D complexes constructed from pyrazole-3,5-dicarboxylate bridging multi copper(II) centers

Massoud¹,

Louka²,

Nguyen³

et al. 2011

Inorganica Chimica Acta

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“…However, it should be noted that the μ 2 ‐OH 2 bridge is probably not affecting significantly the magnetic properties of the copper binuclear system as a consequence of the weak interaction with the axial positions of the copper coordination polyhedra. Therefore, the small differences found in the magnetic behavior of both systems should be attributed to a probable tetrahedral distortion of the metal centers and to deviations of the pyrazole ring from Cu‐N‐N‐Cu plane 22…”

Section: Resultsmentioning

confidence: 95%

A Soft Copper(II) Porous Coordination Polymer with Unprecedented Aqua Bridge and Selective Adsorption Properties

Procopio

Fukushima

Barea

et al. 2012

Chemistry A European J

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Herein, the synthesis, crystal structure, and full characterization of a new soft porous coordination polymer (PCP) of ([Cu(2)(dmcapz)(2)(OH(2))]DMF(1.5))(n) (1) formulation, which is easily obtained in the reaction of CuX(2) (X = Cl, NO(3)) salts with 3,5-dimethyl-4-carboxypyrazole (H(2)dmcapz) is present. Compound 1 shows a copper(II) dinuclear secondary building unit (SBU), which is supported by two pyrazolate bridges and an unprecedented H(2)O bridge. The dinuclear SBUs are further bridged by the carboxylate ligands to build a diamondoid porous network. The structural transformations taking place in 1 framework upon guest removal/uptake has been studied in detail. Indeed, the removal of the bridging water molecules gives rise to a metastable evacuated phase (1 b) that transforms into an extremely stable porous material (1 c) after freezing at liquid-nitrogen temperature. The soaking of 1 c into water allows the complete and instantaneous recover of the water-exchanged material (1 a'). Remarkably, 1 b and 1 c materials possess structural bistability, which results in the switchable adsorptive functions. Therefore, the gas-adsorption properties of both materials have been studied by means of single-component gas adsorption isotherms as well as by variable-temperature pulse-gas chromatography. Both materials present permanent porosity and selective gas-adsorption properties towards a variety of gases and vapors of environmental and industrial interest. Moreover, the flexible nature of the coordination network and the presence of highly active convergent open metal sites confer on these materials intriguing gas-adsorption properties with guest-triggered framework-breathing phenomena being observed. The plasticity of Cu(II) metal center and its ability to form stable complexes with different coordination numbers is at the origin of the structural transformations and the selective-adsorption properties of the studied materials.

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“…[20, 22,25] There are only few examples with antiferromagnetic coupling stronger than -200 cm -1 , [21] with the maximum value -243 cm -1 .…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…[22] Those parameters essentially reflect the asymmetry or distortion of the Cu(µ-pyrazolato) 2 Cu central core, which effects the overlap between the magnetic copper atomic orbitals and the pyrazolate ligand orbitals. For bis(µ-pyrazolato)-bridged dicopper(II) compounds J has usually been found in the range -70 to -160 cm -1 .…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…[20-22] Previous magnetostructural considerations have identified various parameters that determine the strength of the antiferromagnetic coupling: (i) the distortion of copper(II) coordination geometry from square pyramidal towards trigonal bipyramidal, [22] (ii) the deviation from coplanarity of the pyrazolate planes and of the copper coordination planes, [23] (iii) the Cu-N-N angle [taking the difference δ(CuNN) between the deviations of the Cu-N-N and Cu-NЈ-NЈ angle with respect to an optimum angle as a structural parameter] [24] and (iv) the bending angles δ pz-bend . [22] Those parameters essentially reflect the asymmetry or distortion of the Cu(µ-pyrazolato) 2 Cu central core, which effects the overlap between the magnetic copper atomic orbitals and the pyrazolate ligand orbitals.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Bis(terdentate) Pyrazole/Pyridine Ligands: Synthesis, Crystal Structures and Magnetic Properties of Bridged Binuclear and Tetranuclear Copper(II) Complexes

et al. 2009

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Magnetic properties and crystal structures of bis(μ-pyrazolato)-bridged dicopper(II,II) complexes with 1,10-phenanthroline or 2,2′-bipyridine

Cited by 48 publications

References 24 publications

Structural and magnetic characterization of 1-D complexes constructed from pyrazole-3,5-dicarboxylate bridging multi copper(II) centers

Structural and magnetic characterization of 1-D complexes constructed from pyrazole-3,5-dicarboxylate bridging multi copper(II) centers

A Soft Copper(II) Porous Coordination Polymer with Unprecedented Aqua Bridge and Selective Adsorption Properties

Bis(terdentate) Pyrazole/Pyridine Ligands: Synthesis, Crystal Structures and Magnetic Properties of Bridged Binuclear and Tetranuclear Copper(II) Complexes

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