Crystal engineering to control the magnetic interaction between weak ferromagnetic single-chain magnets assembled in a 3D framework

2016 ◽  
Vol 52 (56) ◽  
pp. 8722-8725 ◽  
Author(s):  
Lei Su ◽  
Wei-Chao Song ◽  
Jiong-Peng Zhao ◽  
Fu-Chen Liu
Keyword(s):  
Crystal Engineering ◽  
Magnetic Interaction ◽  
High Dimensional ◽  
Single Chain ◽  
Synthetic Strategy ◽  
Dimensional Network ◽  
3D Framework ◽  
Single Chain Magnets ◽  
Weak Ferromagnetic

A synthetic strategy of control of the arrangement and the magnetism of the SCMs by assembly of the chains into a high dimensional network was illustrated in a family of a weak antiferromagnetic chain based 3D framework.

Molecular Engineering To Control the Magnetic Interaction between Single-Chain Magnets Assembled in a Two-Dimensional Network

2012 ◽  
Vol 134 (37) ◽  
pp. 15265-15268 ◽  
Author(s):  
Luminita M. Toma ◽  
Catalina Ruiz-Pérez ◽  
Jorge Pasán ◽  
Wolfgang Wernsdorfer ◽  
Francesc Lloret ◽  
...  
Keyword(s):  
Magnetic Interaction ◽  
Molecular Engineering ◽  
Two Dimensional ◽  
Single Chain ◽  
Dimensional Network ◽  
Single Chain Magnets

Single-chain magnets constructed with a twisting arrangement of the easy-plane of iron(II) ions

2008 ◽  
Vol 80 (11) ◽  
pp. 2297-2308 ◽  
Author(s):  
Takashi Kajiwara ◽  
Hiroki Tanaka ◽  
Masahiro Yamashita
Keyword(s):  
Structural Changes ◽  
Easy Axis ◽  
Muon Spin ◽  
Ac Susceptibility ◽  
Magnetic Interaction ◽  
Easy Plane ◽  
Structural Motif ◽  
Time Range ◽  
Single Chain ◽  
Single Chain Magnets

A novel class of single-chain magnets (SCMs), catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 and its derivative, were synthesized using the spin-carrier components possessing hard-axis anisotropy (or easy-plane anisotropy, D > 0). The easy-axis-type anisotropy of whole molecules of these compounds, which is essential for the formation of SCMs, arises from the twisted arrangement of easy-planes of Fe(II) along the chain axis. Alternating high-spin Fe(II) and low-spin Fe(III) chain complexes behave as an SCM with a typical frequency-dependent ac susceptibility which obeys Arrhenius law. Below 7 K, catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 showed a short-range spin-ordering even in zero external field in a time range of Mössbauer spectroscopy as well as the muon-spin-relaxation (μSR) spectroscopy. Since the easy-axis-type magnetic anisotropy originated from the structural motif of the twisting arrangement of Fe(II) ions, the overall magnetic property was very sensitive to the small structural changes arising from adsorption/desorption of the crystal solvents, and catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 showed a reversible change in magnetism that has been referred to as "a magnetic sponge". In its derivative, controls of the molecular structure, the arrangement of chains in the crystal, and magnetic properties both in dc and ac susceptibility have been achieved by the introduction of methyl group on a bpca- ligand, which bridges and mediates the magnetic interaction of the adjoining Fe(II)/Fe(III) ions.

Sterically-induced synthesis of 3d–4f one-dimensional compounds: A new route towards 3d–4f single chain magnets

2008 ◽  
Vol 361 (14-15) ◽  
pp. 3997-4003 ◽  
Author(s):  
G. Calvez ◽  
K. Bernot ◽  
O. Guillou ◽  
C. Daiguebonne ◽  
A. Caneschi ◽  
...  
Keyword(s):  
Single Chain ◽  
One Dimensional ◽  
Sterically Induced ◽  
Single Chain Magnets

scholarly journals Reorientation of α-Fe2O3crystallites in an external magnetic field

2014 ◽  
Vol 70 (a1) ◽  
pp. C165-C165
Author(s):  
Michał Stękiel ◽  
Radosław Przeniosło ◽  
Dariusz Wardecki ◽  
Thomas Buslaps ◽  
Jacek Jasiński
Keyword(s):  
Magnetic Field ◽  
Angular Distribution ◽  
External Field ◽  
Intensity Distribution ◽  
Azimuthal Angle ◽  
Magnetic Interaction ◽  
Cylindrical Container ◽  
Ambient Conditions ◽  
X Ray ◽  
Weak Ferromagnetic

The magnetic interaction between the crystallites of weak ferromagnetic α-Fe2O3 has been studied by combining SR based X-ray diffraction with an externally applied magnetic field. The measurements were performed with several polycrystalline α-Fe2O3 [1,2] samples (dry or in suspensions) placed in a half-filled cylindrical container in ambient conditions. The axis of the cylindrical container was oriented vertically parallel to the applied dc magnetic field. The polycrystalline sample had a free surface, so the α-Fe2O3 crystallites were free to move. The full Debye-Scherrer diffraction rings were measured with a 2D pixel detector at the beamline ID-15B at ESRF. In the absence of the magnetic field the intensity distribution over azimuthal angle was a uniform, i.e. there was no texture. The applied maximal field, B=0.9T was too small to change the magnetic ordering of α-Fe2O3 but it was sufficiently strong to reorient large amount of crystallites in order to minimize the angle between their ferromagnetic moment direction and the external field. Pronounced texture patterns with clear maxima in the angular distribution of the intensity across each Debye-Scherrer ring were observed. The observed textured intensity distribution was analyzed quantitatively by using a model based on the magnetic anisotropy observed in single crystals of α-Fe2O3. The analysis yielded two important parameters: (i) the width of the angular distribution of the ferromagnetic moments directions around the external field direction, and (ii) the relative quantity of the crystallites that did reorient in the external field. The α-Fe2O3 samples were also characterized with TEM technique. The analysis of X-ray and TEM studies provide new conclusions about the magnetic interaction between the α-Fe2O3 crystallites [3]. The proposed measurement technique can be applied to study other weak ferromagnetic materials.

A unique substituted Co(ii)-formate coordination framework exhibits weak ferromagnetic single-chain-magnet like behavior

2012 ◽  
Vol 48 (52) ◽  
pp. 6568 ◽  
Author(s):  
Jiong-Peng Zhao ◽  
Qian Yang ◽  
Zhong-Yi Liu ◽  
Ran Zhao ◽  
Bo-Wen Hu ◽  
...  
Keyword(s):  
Single Chain ◽  
Coordination Framework ◽  
Weak Ferromagnetic

3D-[Pr(Im)3(ImH)]@ImH: Ein dreidimensionales Netzwerk mit vollständiger Stickstoffkoordination aus einer Imidazolschmelze / 3D-[Pr(Im)3(ImH)]@ImH: A Three-Dimensional Network with Complete Nitrogen Coordination Obtained from an Imidazole Melt

2006 ◽  
Vol 61 (7) ◽  
pp. 792-798 ◽  
Author(s):  
Klaus Müller-Buschbaum
Keyword(s):  
Crystal Engineering ◽  
Material Science ◽  
Three Dimensional ◽  
Temperature Dependent ◽  
Temperature Synthesis ◽  
3 Dimensional ◽  
High Temperature Synthesis ◽  
Dimensional Network ◽  
Bright Green ◽  
Gas Molecules

The reaction of a melt of unsubstituted imidazole with praseodymium metal yields bright green crystals of 3D-[Pr(Im)3(ImH)]@ImH. Imidazolate ligands coordinate η1 via both N atoms their 1,3 positioning within the heterocycle being responsible for the connection of praseodymium atoms. A 3-dimensional network is formed with imidazole molecules from the melt intercalated in the crystal structure. The imidazole molecules can be released and temperature dependent reversibly be exchanged with gas molecules including argon. Thus the solvent free high temperature synthesis of rare earth elements with amine melts can also be utilized for “crystal engineering” and the synthesis of compounds with material science aspects. Furthermore 3D-[Pr(Im)3(ImH)]@ImH is the first unsubstituted imidazolate of the lanthanides.

Design of single chain magnets through cyanide-bearing six-coordinate complexes

2005 ◽  
Vol 249 (23) ◽  
pp. 2691-2729 ◽  
Author(s):  
Rodrigue Lescouëzec ◽  
Luminita Marilena Toma ◽  
Jacqueline Vaissermann ◽  
Michel Verdaguer ◽  
Fernando S. Delgado ◽  
...  
Keyword(s):  
Single Chain ◽  
Single Chain Magnets
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