11 research outputs found
Tuning the Structure and Magnetism of Heterometallic Sodium(1+)–Cobalt(2+) Formate Coordination Polymers by Varying the Metal Ratio and Solvents
Three
new heterometallic formate coordination polymers formulated as [Na<sub>2</sub>CoÂ(HCOO)<sub>4</sub>]<sub>∞</sub> (<b>1</b>),
[NaCoÂ(HCOO)<sub>3</sub>]<sub>∞</sub> (<b>2</b>), and
[Na<sub>2</sub>Co<sub>7</sub>(HCOO)<sub>16</sub>]<sub>∞</sub> (<b>3</b>) were obtained by adjusting the solvent and ratio
of the reactants. In <b>1</b>, a (4,4) cobalt formate layer
is formed and the sodium ions connect the layers to form a three-dimensional
(3D) framework. In <b>2</b>, each formate ligand binds two Co<sup>2+</sup> and two Na<sup>+</sup> ions with a syn,syn,anti,anti coordination
mode to form a chrial network with 4,6-connected topology. <b>3</b> is a Na<sup>+</sup>-ion-linked 3D framework based on the cobalt
formate layer, which has a 10-membered metal ring. Magnetic studies
indicate the existence of ferromagnetic interactions between adjacent
Co<sup>2+</sup> ions in <b>1</b>, while dominating antiferromagnetic
couplings in <b>2</b> and <b>3</b>
Two Cobalt-diphosphonates Templated by Long-Chain Flexible Amines: Synthesis, Structures, Proton Conductivity, and Magnetic Properties
Two
new cobalt-diphosphonates templated by protonated 1,2-bisÂ(3-aminopropylamino)Âethane
(BAPEN), (C<sub>8</sub>N<sub>4</sub>H<sub>26</sub>)<sub>0.5</sub>·[CoÂ(HEDP)]·H<sub>2</sub>O (<b>1</b>) and (C<sub>8</sub>N<sub>4</sub>H<sub>26</sub>)·[Co<sub>2</sub>(HEDP)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·5H<sub>2</sub>O (<b>2</b>), were hydrothermally prepared
(HEDP = CH<sub>3</sub>CÂ(OH)Â(PO<sub>3</sub>)<sub>2</sub>, 1-hydroxyethylidenediphosphonate).
Compounds <b>1</b> and <b>2</b> exhibit anionic 1D Co-HEDP
chain and 2D Co-HEDP layer structure, respectively. The structure
diversities from 1D chain to 2D layer was realized by adjusting the
synthetic parameters. Their magnetism and proton conduction have been
studied. Magnetic measurements indicated that the title compounds
exhibit weak magnetic interactions. Compounds <b>1</b> and <b>2</b> feature a proton conductivity of 3.57 × 10<sup>–4</sup> and 9.43 × 10<sup>–5</sup> S cm<sup>–1</sup> at
100% relative humidity and 65 °C, respectively
3D Gd<sup>III</sup> Complex Containing Gd<sub>16</sub> Macrocycles Exhibiting Large Magnetocaloric Effect
Hydrothermal
synthesis of Gd<sub>2</sub>O<sub>3</sub> and iminodiacetic
acid (H<sub>2</sub>IDA) yields a three-dimensional (3D) complex {[Gd<sub>2</sub>(IDA)<sub>3</sub>]·2H<sub>2</sub>O}<sub><i>n</i></sub> (<b>1</b>) including Gd<sub>16</sub> macrocycles. Magnetic
investigation indicates the presence of weak antiferromagnetic interaction
between Gd<sup>III</sup> ions and a large magnetocaloric effect with
−Δ<i>S</i><sub>m</sub><sup>max</sup> = 40.6
J kg<sup>–1</sup> K<sup>–1</sup>
3D Inorganic Cuprous Iodide Open-Framework Templated by In Situ <i>N</i>‑Methylated 2,4,6-Tri(4-pyridyl)-1,3,5-triazine
A novel
3D inorganic cuprous iodide framework templated by in situ <i>N</i>-methylated 2,4,6-triÂ(4-pyridyl)-1,3,5-triazine (TPT) was
solvothermally prepared and structurally characterized. The title
compound bearing chiral cuprous iodide chains as building units is
the first 3D extended framework with the TPT-derivatives as template.
The UV–vis diffuse-reflectance measurement reveals that <b>1</b> possesses semiconductor behavior with band gaps of 1.35
eV. The photoluminescent property of <b>1</b> has also been
studied
3D Gd<sup>III</sup> Complex Containing Gd<sub>16</sub> Macrocycles Exhibiting Large Magnetocaloric Effect
Hydrothermal
synthesis of Gd<sub>2</sub>O<sub>3</sub> and iminodiacetic
acid (H<sub>2</sub>IDA) yields a three-dimensional (3D) complex {[Gd<sub>2</sub>(IDA)<sub>3</sub>]·2H<sub>2</sub>O}<sub><i>n</i></sub> (<b>1</b>) including Gd<sub>16</sub> macrocycles. Magnetic
investigation indicates the presence of weak antiferromagnetic interaction
between Gd<sup>III</sup> ions and a large magnetocaloric effect with
−Δ<i>S</i><sub>m</sub><sup>max</sup> = 40.6
J kg<sup>–1</sup> K<sup>–1</sup>
Synthesis and Magnetic Properties of a Series of Octanuclear [Fe<sub>6</sub>Ln<sub>2</sub>] Nanoclusters
The
reaction of polydentate ligand Bis-tris propane {(CH<sub>2</sub>OH)<sub>3</sub>CNHÂ(CH<sub>2</sub>)<sub>3</sub>NHCÂ(CH<sub>2</sub>OH)<sub>3</sub>} with LnÂ(NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O
and Fe<sub>3</sub>O precursor resulted in the formation of a series
of Fe<sub>6</sub>Ln<sub>2</sub> nanoclusters. Magnetic measurements
indicate that the Fe<sub>6</sub> core exhibits ferrimagnetic behavior,
and slow magnetic relaxation was observed in Fe<sub>6</sub>Dy<sub>2</sub> and Fe<sub>6</sub>Tb<sub>2</sub>
Large Heterometallic Dy<sub>12</sub>Na<sub>6</sub> Cage-like Cluster Supported by in Situ Generated Ligand
A novel
heterometallic cluster, Dy<sub>12</sub>Na<sub>6</sub>,
has been prepared and characterized. It represents an unprecedented
high-nuclearity alkali-metal-Ln cluster with a cage-like shape. In
situ generated ligands participated in the formation of the heterometallic
cluster. Magnetic measurements suggest that Dy<sub>12</sub>Na<sub>6</sub> shows slow magnetic relaxation at low temperature
A Spin-Canted Polynuclear Manganese Complex Comprised of Alternating Linkage of Cyclic Tetra-and Mononuclear Fragments
A polynuclear manganese
complex composed of alternating cyclic
tetramer and monomer has been solvothermally prepared and magnetically
characterized. Magnetic analyses indicate that the title compound
shows spin-canting behavior
A Spin-Canted Polynuclear Manganese Complex Comprised of Alternating Linkage of Cyclic Tetra-and Mononuclear Fragments
A polynuclear manganese
complex composed of alternating cyclic
tetramer and monomer has been solvothermally prepared and magnetically
characterized. Magnetic analyses indicate that the title compound
shows spin-canting behavior
An Unprecedented Decanuclear Gd<sup>III</sup> Cluster for Magnetic Refrigeration
An
unprecedented decanuclear Gd<sup>III</sup> cluster composed of the
[Gd<sub>10</sub>(μ<sub>3</sub>-OH)<sub>8</sub>]<sup>22+</sup> core has been hydrothermally synthesized. Magnetic analyses indicate
that this complex shows weak antiferromagnetic behavior with a relatively
large magnetocaloric effect (−Δ<i>S</i><sub>m</sub><sup>max</sup> = 31.22 J kg<sup>–1</sup> K<sup>–1</sup>)