Monometallic Lanthanoid Assembly Showing Ferromagnetism with a Curie Temperature of 11 K

We prepared a three-dimensional monometallic lanthanoid assembly, Na5[Ho(THB4−)2]·7H2O (THB = 1,2,4,5-tetrahydroxybenzene), that exhibits ferromagnetism with a Curie temperature of 11 K. Such a ferromagnetic ordering is due to the effective mediation of the magnetic interaction between Ho3+ ions by the THB4− ligand

Monometallic Lanthanoid Assembly Showing Ferromagnetism with a Curie Temperature of 11 K

We prepared a three-dimensional monometallic lanthanoid assembly, Na5[Ho(THB4−)2]·7H2O (THB = 1,2,4,5-tetrahydroxybenzene), that exhibits ferromagnetism with a Curie temperature of 11 K. Such a ferromagnetic ordering is due to the effective mediation of the magnetic interaction between Ho3+ ions by the THB4− ligand

Vanadium(II) Heptacyanomolybdate(III)-Based Magnet Exhibiting a High Curie Temperature of 110 K

We prepared a vanadium heptacyanomolybdate-based magnet, VII2[MoIII(CN)7]·(pyrimidine)2·4.5H2O (VMo), with a Curie temperature (TC) of 110 K, which is the highest TC value in [MoIII(CN)7]-based magnets. Additionally, MnII2[MoIII(CN)7]·(pyrimidine)2·2H2O (MnMo) of a monoclinic structure (P21/n) with TC = 47 K was prepared to confirm the crystal structure of VMo

A Polyoxometalate–Cyanometalate Multilayered Coordination Network

The reaction of the ε-Keggin polyoxometalate (POM) [PMo₁₂O₃₆(OH)₄{La­(H₂O)₄}₄]⁵⁺ with Fe^II(CN)₆^4– under typical bench conditions at room temperature and ambient pressure has afforded the novel [ε-PMo₁₂O₃₇(OH)₃{La­(H₂O)₅(Fe­(CN)₆)_0.25}₄] network, which exhibits a three-dimensional multilayered structure. The compound has been fully characterized by synchrotron-radiation X-ray crystallography, IR spectroscopy, elemental analysis, and thermogravimetric analysis. This coordination network constitutes the first example of a cyanometalate bonded to a POM unit

Green to Red Luminescence Switchable by Excitation Light in Cyanido-Bridged Tb^III–W^V Ferromagnet

Green to Red Luminescence Switchable by Excitation Light in Cyanido-Bridged TbIII–WV Ferromagne

Vanadium(II) Heptacyanomolybdate(III)-Based Magnet Exhibiting a High Curie Temperature of 110 K

We prepared a vanadium heptacyanomolybdate-based magnet, VII2[MoIII(CN)7]·(pyrimidine)2·4.5H2O (VMo), with a Curie temperature (TC) of 110 K, which is the highest TC value in [MoIII(CN)7]-based magnets. Additionally, MnII2[MoIII(CN)7]·(pyrimidine)2·2H2O (MnMo) of a monoclinic structure (P21/n) with TC = 47 K was prepared to confirm the crystal structure of VMo

High Thermal Durability of Water-Free Copper-Octacyanotungsten-Based Magnets Containing Halogen Bonds

Two-dimensional (2-D) cyano-bridged Cu–W bimetallic assemblies that include halogen-substituted pyridine molecules, [Cu^II(3-iodopyridine)₄][Cu^II(3-iodopyridine)₂]₂[W^V(CN)₈]₂ (<b>1</b>) (triclinic crystal structure, <i>P</i>1̅ space group), [Cu^II(3-bromopyridine)₄][Cu^II(3-bromopyridine)₂]₂[W^V(CN)₈]₂ (<b>2</b>) (triclinic, <i>P</i>1̅), and [Cu^II(3-chloropyridine)₂(H₂O)₂][Cu^II(3-chloropyridine)₂]₂[W^V(CN)₈]₂·4H₂O (<b>3</b>) (monoclinic, <i>P</i>2₁/<i>c</i>), were synthesized. Thermogravimetric measurements demonstrate that <b>1</b> and <b>2</b> have high thermal durability up to ca. 150 °C (423 K) due to the lack of water molecules in the crystal and the stacked Cu–W 2-D layers with halogen bonding between halogen-substituted pyridine and the cyano nitrogen of octacyanotungstate. In contrast, <b>3</b> exhibits weight loss above ca. 50 °C (323 K) as the water molecules between the 2-D layers are removed upon heating. Magnetic measurements show that <b>1</b>–<b>3</b> are ferromagnets due to parallel ordering of the magnetic spins on Cu^II (<i>S</i> = 1/2) and W^V (<i>S</i> = 1/2) with Curie temperatures (<i>T</i>_C) of 4.7 K (<b>1</b>), 5.2 K (<b>2</b>), and 7.2 K (<b>3</b>)

Green to Red Luminescence Switchable by Excitation Light in Cyanido-Bridged Tb^III–W^V Ferromagnet

Green to Red Luminescence Switchable by Excitation Light in Cyanido-Bridged Tb^III–W^V Ferromagne

Cavity-Induced Spin−Spin Interaction between Organic Radicals within a Self-Assembled Coordination Cage

We present a new approach for manipulating spin−spin interaction by the self-assembled M6L4-coordination cage. Stable radicals are encapsulated by the cage to become a radical pair in triplet state in both solid and solution states, although the radicals themselves show doublet character without particular intermolecular interaction in solution. These results were confirmed by ESR spectroscopy and X-ray crystallography

Size-Controlled Synthesis of Polymer Nanoparticles with Tandem Acoustic Emulsification Followed by Soap-Free Emulsion Polymerization

We have developed a novel synthesis method for size-controlled polymer nanoparticles using soap-free emulsion polymerization. This new synthetic method involves sequential ultrasonic irradiation (20 kHz → 500 kHz → 1.6 MHz → 2.4 MHz) for acoustic emulsification of a water-insoluble monomer such as methylmethacrylate (MMA) in an aqueous medium, followed by emulsion polymerization in the obtained solution without using any surfactants. The sequential ultrasonication (tandem acoustic emulsification) could provide a clear and stable emulsified solution containing monomer droplets with relatively narrow size distribution in the nanometer range. The subsequent polymerization in this solution yielded size-controlled polymer nanoparticles. Furthermore, colloidal crystal films could be easily prepared from the as-polymerized nanoparticle solution using the fluidic-cell method