Heavy Prussian Blue Analog with Magnetic Ordering above 400 K

TL;DR

Scientists created a new magnetic material that works above 400 K, a major step toward room-temperature multifunctional magnets.

Contribution

A cyanido-bridged Prussian Blue analog with ferrimagnetic ordering above 400 K is synthesized and characterized.

Findings

The compound shows ferrimagnetic ordering with a critical temperature exceeding 400 K.

SQUID and XMCD confirm antiparallel alignment of vanadium and molybdenum magnetic moments.

Hexacyanomolybdate(III) is established as a viable precursor for high-temperature molecule-based magnets.

Abstract

Molecule‐based magnets hold promise for a variety of applications in information technologies owing to their chemical tunability. This feature can facilitate the integration of desired magnetic properties alongside additional functionalities within a single material. Although numerous cyanido‐bridged assemblies are identified as multifunctional materials at cryogenic temperatures, achieving analogous behavior at room temperature remains a challenge. This study reports a cyanido‐bridged compound, which shows ferrimagnetic ordering with a critical temperature exceeding 400 K. This breakthrough is achieved through the mechanochemical synthesis of vanadium(II)‐hexacyanomolybdate(III) Prussian Blue Analog (PBA) under anhydrous conditions. The ferrimagnetic order is evidenced by SQUID (SQUID = superconducting quantum interference device) magnetometry and X‐ray Magnetic Circular Dichroism (XMCD) spectroscopy. Both techniques unambiguously confirm the antiparallel alignment of vanadium and molybdenum magnetic moments. As a result, hexacyanomolybdate(III) is experimentally established as a viable precursor for the preparation of a new generation of high‐temperature molecule‐based magnets and multifunctional materials.

A cyanido‐bridged vanadium(II)–hexacyanomolybdate(III) Prussian Blue analog synthesized mechanochemically exhibits ferrimagnetic ordering above 400 K. SQUID magnetometry and XMCD experiments confirm antiparallel alignment of V and Mo moments. This establishes hexacyanomolybdate(III) as a robust precursor for high‐temperature molecule‐based magnets, marking a major step toward multifunctional materials operating at ambient conditions.

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