Crystal structure and metamagnetic property of a 2-D layered complex, [FeII(N3)2(pyz)]n (pyz = pyrazine)

Hao, Xiang; Wei, Yujie; Zhang, Shiwei

doi:10.1039/b005137n

Cited by 86 publications

(39 citation statements)

References 12 publications

(11 reference statements)

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“…Once again, the pyrimidine bridge yields stronger coupling than does the pyrazine bridge and of a ferromagnetic sign. Long-range order has also been claimed recently in the 2D layered compound [Fe( -1,1-N ) (pyz)], in which, as anticipated earlier (6), the azide bridge leads to ferromagnetically coupled chains, while the pyrazine linkers give antiferromagnetically coupled layers (22). …”

Section: Magnetic Propertiesmentioning

confidence: 80%

Synthesis, Structural Isomerism, and Magnetism of the Coordination Polymers [M(dca)2pyz], M=Mn, Fe, Co, Ni and Zn, dca=Dicyanamide (N(CN) −2), and pyz=Pyrazine

Jensen¹,

Batten²,

Moubaraki³

et al. 2001

Journal of Solid State Chemistry

115

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Section: Magnetic Propertiesmentioning

confidence: 80%

Synthesis, Structural Isomerism, and Magnetism of the Coordination Polymers [M(dca)2pyz], M=Mn, Fe, Co, Ni and Zn, dca=Dicyanamide (N(CN) −2), and pyz=Pyrazine

Jensen¹,

Batten²,

Moubaraki³

et al. 2001

Journal of Solid State Chemistry

115

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“…They include discrete dinuclear or tetranuclear m 1,1 -azido-or cyanato-bridged species, [20] a 2D m 1,1 -N 3 -bridged layered complex, [27] and 2D (m 1,3 -N 3 ) or 1D (m 1,1 -N 3 and m 1,3 -N 3 ) coordination polymers. [28] Thus, complexes 2 and 3 are the first two examples of the m 1,1,1,1 bridging mode in iron(II) chemistry.…”

Section: -Ohmentioning

confidence: 99%

A Family of Enneanuclear Iron(II) Single‐Molecule Magnets

Boudalis¹,

Sanakis²,

Clemente‐Juan³

et al. 2008

Chemistry A European J

108

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Complexes [Fe9(X)2-(O2CMe)8{(2-py)2CO2}4] (X(-)=OH(-) (1), N3(-) (2), and NCO(-) (3)) have been prepared by a route previously employed for the synthesis of analogous Co(9) and Ni(9) complexes, involving hydroxide substitution by pseudohalides (N3(-), NCO(-)). As indicated by DC magnetic susceptibility measurements, this substitution induced higher ferromagnetic couplings in complexes 2 and 3, leading to higher ground spin states compared to that of 1. Variable-field experiments have shown that the ground state is not well isolated from excited states, as a result of which it cannot be unambiguously determined. AC susceptometry has revealed out-of-phase signals, which suggests that these complexes exhibit a slow relaxation of magnetization that follows Arrhenius behavior, as observed in single-molecule magnets, with energy barriers of 41 K for 2 (tau 0=3.4 x 10(-12) s) and 44 K for 3 (tau 0=2.0 x 10(-11) s). Slow magnetic relaxation has also been observed by zero-field 57Fe Mössbauer spectroscopy. Characteristic integer-spin electron paramagnetic resonance (EPR) signals have been observed at X-band for 1, whereas 2 and 3 were found to be EPR-silent at this frequency. 1H NMR spectrometry in CD3CN has shown that complexes 1-3 are stable in solution.

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“…[39,56] Such systems are commonly composed of ferro-or ferrimagnetic sheets or chains that interact or order antiferromagnetically at low temperature and field, but undergo a transition to a ferromagnetic state at a critical field. Examples of metamagnetic coordination polymers include monometallic azido-nickel(II), [57] iron(II), [58] malonato-copper(II) [59] systems as well as a range of bimetallic or metal-radical systems. [60] However, metamagnet type transitions have not, to our knowledge, been reported in the case of the zero-field state being a spin-glass.…”

mentioning

confidence: 99%

A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH₂)₂[Au(CN)₂]₂(M=Cu, Ni)

Lefebvre

Callaghan

Katz

et al. 2006

Chemistry A European J

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The structures of two cyanoaurate-based coordination polymers, M(mu-OH(2))(2)[Au(CN)(2)](2) (M=Cu, Ni), were determined by using a combination of powder and single-crystal X-ray diffraction techniques. The basic structural motif for both polymers contains rarely observed M(mu-OH(2))(2)M double aqua-bridges, which generate an infinite chain; two trans [Au(CN)(2)](-) units also dangle from each metal center. The chains form ribbons that interact three dimensionally through CNH hydrogen bonding. The magnetic properties of both compounds and of the dehydrated analogue Cu[Au(CN)(2)](2) were investigated by direct current (dc) and alternating current (ac) magnetometry; muon spin-relaxation data was also obtained to probe their magnetic properties in zero-field. In M(mu-OH(2))(2)[Au(CN)(2)](2), ferromagnetic chains of M(mu-OH(2))(2)M are present below 20 K. Interchain magnetic interactions mediated through hydrogen bonding, involving water and cyanoaurate units, yield a long-range magnetically ordered system in Cu(mu-OH(2))(2)[Au(CN)(2)](2) below 0.20 K, as indicated by precession in the muon spin polarization decay. Ni(mu-OH(2))(2)[Au(CN)(2)](2) undergoes a transition to a spin-glass state in zero-field at 3.6 K, as indicated by a combination of muon spin-relaxation and ac-susceptibility data. This transition is probably due to competing interactions that lead to spin frustration. A phase transition to a paramagnetic state is possible for Ni(mu-OH(2))(2)[Au(CN)(2)](2) upon application of an external field; the critical field was determined to be 700 Oe at 1.8 K. The dehydrated compound Cu[Au(CN)(2)](2) shows weak antiferromagnetic interactions at low temperatures.

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Crystal structure and metamagnetic property of a 2-D layered complex, [FeII(N3)2(pyz)]n (pyz = pyrazine)

Cited by 86 publications

References 12 publications

Synthesis, Structural Isomerism, and Magnetism of the Coordination Polymers [M(dca)2pyz], M=Mn, Fe, Co, Ni and Zn, dca=Dicyanamide (N(CN) −2), and pyz=Pyrazine

Synthesis, Structural Isomerism, and Magnetism of the Coordination Polymers [M(dca)2pyz], M=Mn, Fe, Co, Ni and Zn, dca=Dicyanamide (N(CN) −2), and pyz=Pyrazine

A Family of Enneanuclear Iron(II) Single‐Molecule Magnets

A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH₂)₂[Au(CN)₂]₂(M=Cu, Ni)

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Crystal structure and metamagnetic property of a 2-D layered complex, [FeII(N3)2(pyz)]n (pyz = pyrazine)

Cited by 86 publications

References 12 publications

Synthesis, Structural Isomerism, and Magnetism of the Coordination Polymers [M(dca)2pyz], M=Mn, Fe, Co, Ni and Zn, dca=Dicyanamide (N(CN) −2), and pyz=Pyrazine

Synthesis, Structural Isomerism, and Magnetism of the Coordination Polymers [M(dca)2pyz], M=Mn, Fe, Co, Ni and Zn, dca=Dicyanamide (N(CN) −2), and pyz=Pyrazine

A Family of Enneanuclear Iron(II) Single‐Molecule Magnets

A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH2)2[Au(CN)2]2(M=Cu, Ni)

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A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH₂)₂[Au(CN)₂]₂(M=Cu, Ni)