Archive for April, 2011

Perspective: Multi-functional magnets with Prussian blue analogs

In this Dalton Transactions Perspective, Shin-ichi Ohkoshi and Hiroko Tokoro discuss cyano-bridged bimetal assemblies (particularly Prussian blue analogs) that demonstrate novel magnetic functionalities.  Charge-transfer phase transitions, reversible photomagnetism, second harmonic generation along with magnetization-induced second harmonic generation, ferroelectric ferromagnetism, humidity-sensitive magnetism, high ionic conductivity, and a coupling effect (termed spin-ionics) between ionic conduction and magnetic ordering within Prussian blue analogs is described.

Prussian blue analogs have been intensively studied due to (i) their flexible structure, which meet conditions for charge-transfer, photoinduced change, and absorption and desorption of water, and (ii) the strong exchange coupling of the magnetic centers through cyano-bridged ligands.

To find out more about this fascinating area, read for free until 29th April here.

Novel magnetic functionalities of Prussian blue analogs
Hiroko Tokoro and Shin-ichi Ohkoshi
Dalton Trans., 2011, Advance Article, DOI: 10.1039/C0DT01829E

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Precursor boost for uranium chemistry

This week Chemistry World reports how the study of uranium chemistry should become significantly easier thanks to researchers in the US who have discovered a simple way to make key precursors to a wide range of low valency uranium compounds.

A deep understanding of uranium chemistry is important not only for developing improved nuclear fuel cycles, but because the element has also shown promise in materials such as superconductors and catalysts. Uranium complexes are highly sensitive to water and air, but the only viable syntheses started from aqueous reactions of uranium oxides with harsh chlorinating reagents at high temperatures. Read more in Simon Hadlington’s Chemistry World story

See also Jackie’s recent ChemComm article reporting convenient access to thorium complexes.

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