1,2,4-Triazole Complexes VIII *

Engelfriet, D. W.; Groeneveld, W. L.; Groenendijk, H.A.; Smit, J.; Nap, G. M.

doi:10.1515/zna-1980-0122

Cited by 37 publications

(26 citation statements)

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“…This situation is analogous to that encountered in Co (trz) 2 (NCS) 2 [4], where it was found that the magnetic moments are at angles of 7.4° and -7.4° with the b direction. Further- Fe (trz) 2 (NCS) 2 will be close to 10° also.…”

Section: Canting Mechanismsupporting

confidence: 72%

“…Atomic form factors for Fe(II) were taken from Watson and Freeman [22] and scattering lengths from Bacon [23]. The agreement indices which are referred to have been given previously [4,21]. The profile intensities Brought to you by | MIT Libraries Authenticated Download Date | 5/12/18 5:54 PM a is the acute angle between the scattering vector and the normal of the platelike crystallites.…”

Section: Magnetic Structure and Interlay Er Interactionsmentioning

confidence: 99%

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1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)₂ (NCS)₂, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.

Engelfriet

Groeneveld

Nap

1980

Zeitschrift Für Naturforschung A

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Fe(trz)2(NCS)2 has been investigated by means of magnetic susceptibility and magnetization measurements on single crystals at temperatures 1.8-300 K, heat capacity measurements at 1.5-90 K and neutron powder diffraction at 1.2 K. The compound orders antiferromagnetically at Tc = 8.46(2) K. The susceptibilities along the orthorhombic axes are strongly anisotropic, the a axis being the preferred direction. The susceptibility data along a and the heat capacity results are in reasonable agreement with the predictions for the quadratic layer, 8 = Ising antiferromagnet, with an intralayer exchange constant J Ik --7.2(2) K. Below Tc the magnetization curve along the a axis reveals a metamagnetic transition at 1.74 kOe. In accordance with the Ising-like properties, a direct transition from the antiferromagnetic to the paramagnetic state is observed along a at 50 kOe.Hidden canting is found to be present. At 1.2 K the compound appears to be monoclinically distorted with a = 88.3° (with respect to Aba2, the space group at 300 K). The magnetic structure consists probably of four sublattices with the magnetic moments lying in the planes 2 = 0 and z -\ (with respect to the distorted cell in Aba2) along directions that are at an angle of 8° with the a axis.Ligand bonding parameters are discussed in terms of the angular overlap model.

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Section: Canting Mechanismsupporting

confidence: 72%

Section: Magnetic Structure and Interlay Er Interactionsmentioning

confidence: 99%

1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)₂ (NCS)₂, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.

Engelfriet

Groeneveld

Nap

1980

Zeitschrift Für Naturforschung A

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“…We note that the value of (43 K)/ (¹ , ) is much less than , which is expected for a randomly oriented polycrystalline sample of a two-sublattice antiferromagnet. This is likely to be due to hidden canting that occurs for antiferromagnets having more than four sublattices (26) or equally to very strong anisotropy (27).…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Two Modifications of Layered Cobaltous Terephthalate: Crystal Structures and Magnetic Properties

Kurmoo

Kumagai

Green

et al. 2001

Journal of Solid State Chemistry

141

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“…However, the result of the AC susceptibility reveals that compound 5 can be regarded as a hidden spincanted antiferromagnet because the obvious in-phase c'(T) cusps appear at 10.6 K and they are frequency independent while the corresponding c''(T) components are not observed. [20] …”

mentioning

confidence: 99%

The Silica‐Like Extended Polymorphism of Cobalt(II) Imidazolate Three‐Dimensional Frameworks: X‐ray Single‐Crystal Structures and Magnetic Properties

Tian

Cai

Ren

et al. 2003

Chemistry A European J

279

146

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Five polymorphous frameworks of cobalt(II) imidazolates (1-5) have been prepared by solvatothermal syntheses. Of these, compound 3 has already been synthesized in a gas-phase reaction by Seel et al. in 1969 and structurally characterized by Sturm et al. in 1975. The new synthetic strategy affords four polymorphous frameworks of cobalt(II) imidazolates (1, 2, 4, 5) of crystalline substances, of which the compound 4 (a = b = 23.450(3), c = 12.460(3) A, tetragonal, I4(1)cd, Z = 16) is an isomorphous compound of [Zn(im)(2)]( infinity ), which was also synthesized in a gas-phase reaction in 1980. The frameworks of compounds 1 and 2 are porous and isostructural; they have the same framework topology that represents a novel uninodal (6,4)-net: 1: a = 18.513(4), b = 24.368(5), c = 9.2940(19) A, orthorhombic, Fdd2, Z = 16; 2: a = 17.635(4), b = 27.706(6), c = 9.0810(18) A, orthorhombic, Fdd2, Z = 16. The framework of compound 5 exhibits a topology of zeolitic structure with the unit-cell parameters: a = 24.3406(8), b = 9.4526(3), c = 24.8470(8) A, beta = 91.977(1) degrees, monoclinic, P2(1)/n, Z = 4. All polymorphous frameworks of cobalt(II) imidazolates reflect the structural features of silica (SiO(2)) and also exhibit different magnetic behaviors, although the imidazolates transmit the antiferromagnetic coupling between the cobalt(II) ions in all cases. However, the uncompensated antiferromagnetic couplings arise from spin-canting are sensitive to the structures: compound 1 is an antiferromagnet with T(N) = 13.11 K; compounds 2-4 are weak ferromagnets (canted antiferromagnets): 2 shows a very weak ferromagnetism below 15 K, 3 exhibits a relatively strong ferromagnetism below 11.5 K and a coercive field (H(C)) of 1800 Oe at 1.8 K, and 4 displays the strongest ferromagnetism of the three cobalt imidazolates and demonstrates a T(C) of 15.5 K with a coercive field, H(C), of 7300 Oe at 1.8 K. However, compound 5 seems to be a hidden canted antiferromagnet with a magnetic ordering temperature of 10.6 K.

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1,2,4-Triazole Complexes VIII *

Abstract: Co(trz)

Cited by 37 publications

References 0 publications

1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)₂ (NCS)₂, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.

1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)₂ (NCS)₂, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.

Two Modifications of Layered Cobaltous Terephthalate: Crystal Structures and Magnetic Properties

The Silica‐Like Extended Polymorphism of Cobalt(II) Imidazolate Three‐Dimensional Frameworks: X‐ray Single‐Crystal Structures and Magnetic Properties

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1,2,4-Triazole Complexes VIII *

Abstract: Co(trz)

Cited by 37 publications

References 0 publications

1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)2 (NCS)2, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.

1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)2 (NCS)2, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.

Two Modifications of Layered Cobaltous Terephthalate: Crystal Structures and Magnetic Properties

The Silica‐Like Extended Polymorphism of Cobalt(II) Imidazolate Three‐Dimensional Frameworks: X‐ray Single‐Crystal Structures and Magnetic Properties

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1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)₂ (NCS)₂, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.

1,2,4-Triazole Complexes XII * . Magnetic properties of Fe (1, 2, 4-triazole)₂ (NCS)₂, a quasi two-dimensional S = ½. antiferromagnet with hidden canting.