Synthesis, structure and magnetism of a new imidazolate-bridged binuclear complex [Ni2(im)(phen)4]·(NO3)3·3H2O

Niu, Shu Yun; Jin, Jing; Yang, Zhong Zhi; Yang, Guang; Ye, Ling

doi:10.1016/s0022-2860(02)00396-4

Cited by 8 publications

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“…The crystal structure and the magnetic properties of two binuclear pentacoordinate Ni(II) complexes with an imidazolate bridge and nearly perfect spy geometry have been reported in the literature. , The exchange coupling parameters were reported to be anti-ferromagnetic and larger than 30 cm –1 in absolute value, and the effect of the ZFS was not taken into account. The exchange parameter in another binuclear complex with benzoimidazole bridging the Ni(II) ions was found equal to −5.8 cm –1 with D = 50 cm –1 , but the crystal structure was not reported .…”

Section: Resultsmentioning

confidence: 99%

Design of a Binuclear Ni(II) Complex with Large Ising-type Anisotropy and Weak Anti-Ferromagnetic Coupling

et al. 2017

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The preparation of a binuclear Ni(II) complex with a pentacoordinate environment using a cryptand organic ligand and the imidazolate bridge is reported. The coordination sphere is close to trigonal bipyramidal (tbp) for one Ni(II) and to square pyramidal (spy) for the other. The use of the imidazolate bridge that undergoes π-π stacking with two benzene rings of the chelating ligand induces steric hindrance that stabilizes the pentacoordinate environment. Magnetic measurements together with theoretical studies of the spin states energy levels allow fitting the data and reveal a large Ising-type anisotropy and a weak anti-ferromagnetic exchange coupling between the metal ions. The magnitude and the nature of the magnetic anisotropy and the difference in anisotropy between the two metal ions are rationalized using wave-function-based calculations. We show that a slight distortion of the coordination sphere of Ni(II) from spy to tbp leads to an Ising-type anisotropy. Broken-symmetry density functional calculations rationalize the weak anti-ferromagnetic exchange coupling through the imidazolate bridge.

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Section: Resultsmentioning

confidence: 99%

Design of a Binuclear Ni(II) Complex with Large Ising-type Anisotropy and Weak Anti-Ferromagnetic Coupling

et al. 2017

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“…lately, due to applications. [1][2][3][4][5][6][7][8] The dual-core metal center complexes, which could activate some of the methane monooxygenase enzymes, aminopeptidase, urease, as well as various life phosphoesterases systems play an important role. [9][10][11][12] Therefore, the understanding of their structural, magnetic, and spectroscopic properties is very important to rationalize their effects on the catalytic properties of the enzymes as well as for the design of new biomimetic compounds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Characterization of a Binuclear Mixed‐Ligand (Salicylate and N,N‐diethylnicotinamide) Nickel(II) Complex, Its Magnetic Properties. [Ni₂(µ‐Sal)₄(Dena)₂]H₂O

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et al. 2014

J Chinese Chemical Soc

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16 , has been synthesized and explained as structure using some elemental analyses. FT-IR spectra, UV-Vis reflectance, magnetic measurements, thermal analysis and x-ray diffraction methods. The results showed that the unit cell of complex includes two molecules Ni II cation, four molecules salicylates as bridge and two molecules N,N-diethylnicotinamide ligands, also there is one molecule hydrated aqua. The compound crystallizes in the monoclinic space group P2 1 /c with the following unit-cell parameters: a = 13.6776(6) Å, b = 10.5238(3) Å, c = 21.8165(9), a = 90.00º, b = 126.546(3)º, g = 90.00º and Z = 2. The compound [Ni 2 (m-Sal) 4 (Dena) 2 ]H 2 O is a typical paddle-wheel complex structure. Two Ni II ions are bridged by four salicylate ligands (O2, O2 i , O3, O3 i , O5, O5 i , O6 and O6 i ) using a m-COOcoordination mode [symmetry code: (i) 1-x, 1-y, 1-z]. Each Ni II also coordinates to one nitrogen atom (N1 and N1 i ) from one N,N-diethylnicotinamide ligand molecule in the axial position. The complex has strong paramagnetic properties.

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“…Respecto al comportamiento de sitios dinucleares modelos del sitio activo de la CuZn-SOD, en estudios como el realizado por Niu y colaboradores, 39 reportan que en los compuestos homodinucleares de cobre(II), debido a la -simetría‖ de los sitios de cobre, se produce una competencia entre los iones metálicos por ser el sitio catalítico. 40,41,18 Como se mencionó anteriormente, la capacidad del imidazol en la modulación de los potenciales redox de los metales a los que se coordina puede ser una razón de la presencia del anillo de imidazol en sitios activos de metaloproteínas como las SOD.…”

Section: Compuestos Biomiméticos De Sodunclassified

Estudio de reactividad del imidazol en compuestos modelo de superóxido dismutasa cobre-zinc

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Synthesis, structure and magnetism of a new imidazolate-bridged binuclear complex [Ni2(im)(phen)4]·(NO3)3·3H2O

Cited by 8 publications

References 19 publications

Design of a Binuclear Ni(II) Complex with Large Ising-type Anisotropy and Weak Anti-Ferromagnetic Coupling

Design of a Binuclear Ni(II) Complex with Large Ising-type Anisotropy and Weak Anti-Ferromagnetic Coupling

Synthesis and Structural Characterization of a Binuclear Mixed‐Ligand (Salicylate and N,N‐diethylnicotinamide) Nickel(II) Complex, Its Magnetic Properties. [Ni₂(µ‐Sal)₄(Dena)₂]H₂O

Estudio de reactividad del imidazol en compuestos modelo de superóxido dismutasa cobre-zinc

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Synthesis, structure and magnetism of a new imidazolate-bridged binuclear complex [Ni2(im)(phen)4]·(NO3)3·3H2O

Cited by 8 publications

References 19 publications

Design of a Binuclear Ni(II) Complex with Large Ising-type Anisotropy and Weak Anti-Ferromagnetic Coupling

Design of a Binuclear Ni(II) Complex with Large Ising-type Anisotropy and Weak Anti-Ferromagnetic Coupling

Synthesis and Structural Characterization of a Binuclear Mixed‐Ligand (Salicylate and N,N‐diethylnicotinamide) Nickel(II) Complex, Its Magnetic Properties. [Ni2(µ‐Sal)4(Dena)2]H2O

Estudio de reactividad del imidazol en compuestos modelo de superóxido dismutasa cobre-zinc

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Synthesis and Structural Characterization of a Binuclear Mixed‐Ligand (Salicylate and N,N‐diethylnicotinamide) Nickel(II) Complex, Its Magnetic Properties. [Ni₂(µ‐Sal)₄(Dena)₂]H₂O