Towards High TC Ferro and Ferrimagnetic BI and Tridimensional Materials from Molecular Precursors

Gadet, V.; Bujoli-Doeuff, Martine; Force, L.; Malkhi, K. El; Deroy, A.; Besse, J.P.; Chappert, C.; Veillet, P.; Renard, Jean; Beauvillain, P.

doi:10.1007/978-94-011-3254-1_20

Cited by 44 publications

(34 citation statements)

References 28 publications

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“…Magnetic Properties . There are several reports available on the magnetic properties of Co II 1.5 [Fe III (CN) 6 ]. − The magnetic properties of our samples are shown in Figures −7. The product of the molar magnetic susceptibility and temperature, χ M T , versus temperature plot of Co II 1.5 [Fe III (CN) 6 ]·6H 2 O first decreased upon cooling and then increased at lower temperatures (Figure ), indicating a short-range antiferromagnetic interaction between paramagnetic centers bearing different numbers of unpaired electrons (ferrimagnetism).…”

Section: Resultsmentioning

confidence: 99%

Photoinduced Long-Range Magnetic Ordering of a Cobalt−Iron Cyanide

et al. 1999

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Two kinds of cobalt-iron cyanides (Rb(0.66)Co(1.25)[Fe(CN)(6)].4.3H(2)O and Co(1.5)[Fe(CN)(6)].6H(2)O) with different electronic structures have been investigated to understand the photoinduced long-range magnetic ordering. Rb(0.66)Co(1.25)[Fe(CN)(6)].4.3H(2)O produces a photomagnetic effect, whereas Co(1.5)[Fe(CN)(6)].6H(2)O does not respond to light. FT-IR and Mössbauer studies revealed that their oxidation states are expressed as Rb(0.66)Co(III)(0.84)Co(II)(0.41)[Fe(II)(CN)(6)] and Co(II)(1.5)[Fe(III)(CN)(6)], respectively. The difference in the oxidation states of the metal atoms in these two compounds has been explained by the Co coordination with H(2)O or CN ligands. In the case of Rb(0.66)Co(1.25)[Fe(CN)(6)].4.3H(2)O, more CN ligands are involved in coordination than expected in the case of Co(1.5)[Fe(CN)(6)].6H(2)O. A charge-transfer (CT) band from Fe(II) to Co(III) is observed at around 550 nm for Rb(0.66)Co(1.25)[Fe(CN)(6)].4.3H(2)O. The magnetism of Rb(0.66)Co(1.25)[Fe(CN)(6)].4.3H(2)O changed from paramagnetic to ferrimagnetic due to the CT from Fe(II) to Co(III) when illuminated at low temperature. The Curie temperature after illumination was 22 K. This metastable state was stable for more than several days at 5 K. The metastable state was restored back to its original one when the sample was heated to 120 K. It is considered that the interconversion proceeded via a pronounced domain formation.

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Section: Resultsmentioning

confidence: 99%

Photoinduced Long-Range Magnetic Ordering of a Cobalt−Iron Cyanide

et al. 1999

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“…As extensively discussed in the next paragraph, these discrepancies may arise from the closeness of the ordering temperatures (23 K for 1a, 14 K for 2a and 3a, 5.5 for 4a, 55 K for 5a and 66 K for 6a). 41 to those at which characteristic magnetic phenomena (e.g. T max ) are experimentally observed.…”

Section: Formation Of Aqueous Colloids Containing Cyano-bridgedmentioning

confidence: 92%

“…1, Table 2). [41][42][43] The IR spectra were recorded for the nanocomposites 1a-6a especially in the spectral window 2000-2300 cm À1 , i.e. in the vicinity of the CN stretching mode, which is a fingerprint of the structural and electronic changes occurring in analogous Prussian Blues.…”

Section: Synthesis Structural and Textural Characterizationsmentioning

confidence: 99%

“…39,40 The IR spectra of 1a-6a show two characteristic absorption bands in the CN stretching region (Table 2): the high frequency bands can be attributed to the stretching of the CN ligand bridged between M 2+ and M 03+ in the M 2+ -CN-M 03+ mode and the low frequency bands can be assigned to the presence of the linkage isomer with the M 2+ -NC-M 03+ coordination mode, as it was reported for the bulk cyano-bridged coordination polymers. [41][42][43][44] It should be also noted that the IR spectra of the nanocomposites present the characteristic bands of the chitosan matrix.…”

Section: Synthesis Structural and Textural Characterizationsmentioning

confidence: 99%

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Synthesis and studies of water-soluble Prussian Blue-type nanoparticles into chitosan beads

Folch

Larionova

Guari

et al. 2010

Phys. Chem. Chem. Phys.

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A new approach to the synthesis of highly stable aqueous colloids of coordination polymer nanoparticles was developed by using water-soluble chitosan beads as template and as stabilizing agent. The method consists in the synthesis of nanocomposite beads containing cyano-bridged coordination polymer nanoparticles via step-by-step coordination of the metal ions and the hexacyanometallate precursors into the chitosan pores and then water solubilization of these as-obtained nanocomposite beads. We obtain a large range of M(2+)/[M'(CN)(6)](3-)/chitosan (where M(2+) = Ni(2+), Cu(2+), Fe(2+), Co(2+), Mn(2+) and M' = Fe(3+) and Cr(3+)) nanocomposite beads and their respective aqueous colloids containing coordination polymer core/chitosan shell nanoparticles. The nanocomposite beads and the corresponding aqueous colloids were studied by Infrared (IR) and UV-Vis spectroscopy, nitrogen sorption (BET), Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM) and magnetic analyses, which reveal the presence of homogeneously dispersed uniformly-sized cyano-bridged coordination polymer nanoparticles. The detailed studies of the static and dynamic magnetic properties of these nanoparticles show the occurrence of a spin-glass like behavior presumably produced by intra-particle spin disorder due to the low spin exchange energy characterizing these materials.

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“…28 To further understand the magnitude of the magnetic coupling between Mn II and W V ions, the J values have been estimated. J MnW and J MnFe can be obained by eq 3:…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Crystal Structures, and Magnetic Properties of Two Cyano-Bridged Tungstate(V)−Manganese(II) Bimetallic Magnets

et al. 2003

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The reaction of manganese acetate with octacyanotungastate in an aqueous solution of concentrated acetic acid gives two new three-dimensional cyano-bridged manganese(II)-tungstate(V) bimetallic assemblies, [Mn(II)(2)(H(2)O)(2)(CH(3)COO)][W(V)(CN)(8)].2H(2)O (1) (tetragonal space group I4/mcm, a = b = 11.9628(9) A, c = 13.367(2) A, and Z = 4) and Cs(I)(0.5)Mn(II)(2)[W(V)(CN)(8)](CH(3)CO(2))(1.5).H(2)O (2) (monoclinic space group C2/c, a = 16.274(2) A, b = 22.948(6) A, c = 13.196(1) A, beta = 128.040(6) degrees, and Z = 8). In complex 1, W(V)(CN)(8) adopts a square antiprismatic geometry, and each CN group coordinates to the Mn(II) ions forming W-Mn(4)-W-Mn(4)-...columnar linkages where four sites on the Mn(II) ion with octahedral geometry are occupied by CN groups. The columns are parallel and interlock, yielding a network structure. Complex 2 contains two different coordination geometries for W(V)(CN)(8), namely, square antiprismatic and dodecahedral. The columnar structures appear also in 2, where the Mn(II) ions in two different environments provide three and four coordinated sites to the CN groups. The columns are bridged by both dodecahedral W(V)(CN)(8) groups and acetates. Cs ions were intercalated in the lattice by the formation of short attractive contacts with the acetates. The field-cooled magnetization, ac susceptibility, and the field dependence of magnetization measurements show that both 1 and 2 are ferrimagnets with ordering temperatures 40 and 45 K, respectively. The investigation of the magnetostructural correlation shows that the ferrimagnetic ordering in 1 and 2 are attributed to the dominant antiferromagnetic exchange pathways d(z)2(W)-d(x')(y')(Mn) and d(x)2(-y)2(W) - d(x')(y')(Mn).

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Towards High TC Ferro and Ferrimagnetic BI and Tridimensional Materials from Molecular Precursors

Cited by 44 publications

References 28 publications

Photoinduced Long-Range Magnetic Ordering of a Cobalt−Iron Cyanide

Photoinduced Long-Range Magnetic Ordering of a Cobalt−Iron Cyanide

Synthesis and studies of water-soluble Prussian Blue-type nanoparticles into chitosan beads

Synthesis, Crystal Structures, and Magnetic Properties of Two Cyano-Bridged Tungstate(V)−Manganese(II) Bimetallic Magnets

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