Crystal structure at 300 and 105 K, magnetic properties and Moessbauer spectra of bis(triaquatris(4-ethyltriazole-N1)iron(II)-N2,N2',N2")iron(II) hexakis(trifluoromethanesulfonate). A linear, trinuclear iron(II) compound, showing a unique high-spin-low-spin transition of the central iron atom

1984 ◽  
Vol 23 (18) ◽  
pp. 2905-2910 ◽  
Author(s):  
Ger Vos ◽  
Rudolf A. G. De Graaff ◽  
Jaap G. Haasnoot ◽  
Adri M. Van der Kraan ◽  
Peter De Vaal ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
High Spin ◽  
Iron Atom ◽  
Spin Transition

scholarly journals The Effect of Pressure on Magnetic Properties of Prussian Blue Analogues

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 112 ◽  
Author(s):  
Maria Zentkova ◽  
Marian Mihalik
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Prussian Blue ◽  
High Spin ◽  
Pressure Effect ◽  
Spin Transition ◽  
Applied Pressure ◽  
Effect Of Pressure ◽  
Prussian Blue Analogues

We present the review of pressure effect on the crystal structure and magnetic properties of Cr(CN)6-based Prussian blue analogues (PBs). The lattice volume of the fcc crystal structure space group Fm 3 ¯ m in the Mn-Cr-CN-PBs linearly decreases for p ≤ 1.7 GPa, the change of lattice size levels off at 3.2 GPa, and above 4.2 GPa an amorphous-like structure appears. The crystal structure recovers after removal of pressure as high as 4.5 GPa. The effect of pressure on magnetic properties follows the non-monotonous pressure dependence of the crystal lattice. The amorphous like structure is accompanied with reduction of the Curie temperature (TC) to zero and a corresponding collapse of the ferrimagnetic moment at 10 GPa. The cell volume of Ni-Cr-CN-PBs decreases linearly and is isotropic in the range of 0–3.1 GPa. The Raman spectra can indicate a weak linkage isomerisation induced by pressure. The Curie temperature in Mn2+-CrIII-PBs and Cr2+-CrIII-PBs with dominant antiferromagnetic super-exchange interaction increases with pressure in comparison with decrease of TC in Ni2+-CrIII-PBs and Co2+-CrIII-PBs ferromagnets. TC increases with increasing pressure for ferrimagnetic systems due to the strengthening of magnetic interaction because pressure, which enlarges the monoelectronic overlap integral S and energy gap ∆ between the mixed molecular orbitals. The reduction of bonding angles between magnetic ions connected by the CN group leads to a small decrease of magnetic coupling. Such a reduction can be expected on both compounds with ferromagnetic and ferrimagnetic ordering. In the second case this effect is masked by the increase of coupling caused by the enlarged overlap between magnetic orbitals. In the case of mixed ferro–ferromagnetic systems, pressure affects μ(T) by a different method in Mn2+–N≡C–CrIII subsystem and CrIII–C≡N–Ni2+ subsystem, and as a consequence Tcomp decreases when the pressure is applied. The pressure changes magnetization processes in both systems, but we expect that spontaneous magnetization is not affected in Mn2+-CrIII-PBs, Ni2+-CrIII-PBs, and Co2+-CrIII-PBs. Pressure-induced magnetic hardening is attributed to a change in magneto-crystalline anisotropy induced by pressure. The applied pressure reduces saturated magnetization of Cr2+-CrIII-PBs. The applied pressure p = 0.84 GPa induces high spin–low spin transition of cca 4.5% of high spin Cr2+. The pressure effect on magnetic properties of PBs nano powders and core–shell heterostructures follows tendencies known from bulk parent PBs.

High-spin tetranuclear iron(III) grids: Synthesis, crystal structure and magnetic properties

Polyhedron ◽  
2013 ◽  
Vol 52 ◽  
pp. 970-975 ◽  
Author(s):  
Yi-Tong Wang ◽  
Ai-Li Cui ◽  
De-Zhong Shen ◽  
Hui-Zhong Kou
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
High Spin

High-spin α low-spin transition in [Fe(NCS)2(4,4′-bis-1,2,4-triazole)2](H2O). X-ray crystal structure and magnetic, mössbauer and EPR properties

Polyhedron ◽  
1990 ◽  
Vol 9 (24) ◽  
pp. 2971-2979 ◽  
Author(s):  
Wim Vreugdenhil ◽  
John H. Van Diemen ◽  
Rudolf A.G. De Graaff ◽  
Jaap G. Haasnoot ◽  
Jan Reedijk ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Spin ◽  
Spin Transition ◽  
X Ray

scholarly journals Crystal structure and spin-trimer magnetism of Rb2.3(H2O)0.8Mn3[B4P6O24(O,OH)2]

2017 ◽  
Vol 46 (9) ◽  
pp. 2957-2965 ◽  
Author(s):  
Olga V. Yakubovich ◽  
Larisa V. Shvanskaya ◽  
Galina V. Kiriukhina ◽  
Anatoly S. Volkov ◽  
Olga V. Dimitrova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
High Spin ◽  
Rare Combination

The title borophosphate is characterized by a rare combination of the magnetic high-spin Mn2+ ions in both octahedral and tetrahedral coordinations. The crystal structure and magnetic properties are presented.

Metal-Complexes of 1,10-Phenanthroline Derivatives. XV. Complexes of 2-(3,5-Dimethylpyrazol-1-yl)-1,10-phenanthroline

1988 ◽  
Vol 41 (6) ◽  
pp. 873 ◽  
Author(s):  
AS Abushamleh ◽  
HA Goodwin
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
Spectral Data ◽  
High Spin ◽  
Nickel Complex ◽  
Spin Transition ◽  
Critical Value ◽  
Magnetic Data ◽  
Strong Temperature Dependence ◽  
Thermally Induced

Iron(II) and nickel(II) bis ( ligand ) complexes of 2-(3,5-dimethylpyrazol-1-yl)-1,10-phenanthroline (L) have been prepared. The field strength of L as determined from spectral data for the nickel complex is in the range encompassing the critical value at the singlet (1A1) ↔ quintet (5T2) crossover for iron(II). The magnetic properties of the iron(II) complex both in solution and in the solid state are anomalous, and indicative of the occurrence of a thermally induced spin transition. Mossbauer spectral data confirm this, and reveal separate contributions from the singlet and quintet species with a strong temperature-dependence of their relative intensities. Magnetic data for the complex in solution are consistent with a simple high spin ↔ low spin equilibrium, and lead to values of ΔH = 23�0.5 kJ mol-1 and ΔS = 66�5 J K-1 mol-1 for the low spin → high spin transformation.

scholarly journals Synthesis, Crystal Structure and Magnetic Properties of 1D Chain Complexes Based on Azo Carboxylate Oxime Ligand

2021 ◽  
Vol 7 (7) ◽  
pp. 105
Author(s):  
Min Zeng ◽  
Xi Chen ◽  
Hui-Zhong Kou
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
High Spin ◽  
Magnetic Measurements ◽  
Antiferromagnetic Coupling ◽  
Dimensional Chain ◽  
One Dimensional ◽  
Chain Complexes ◽  
1D Chain ◽  
Oxime Ligand

Two carboxylate-bridged one-dimensional chain complexes, {[MnII(MeOH)2][FeIII(L)2]2}n (1) and {[MnII(DMF)2][MnIII(L)2]2·DMF}n (2) [H2L = ((2-carboxyphenyl)azo)-benzaldoxime], containing a low-spin [FeIII(L)2]− or [MnIII(L)2]− unit were synthesized. Magnetic measurements show that the adjacent high-spin MnII and low-spin MIII ions display weak antiferromagnetic coupling via the syn–anti carboxyl bridges, with J = −0.066(2) cm−1 for complex 1 and J = −0.274(2) cm−1 for complex 2.

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