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End-to-end azido-pinned interlocking lanthanide squares.

Xiao-Lei Li1, Jianfeng Wu2, Lang Zhao2

  • 1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn and Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, P. R. China.

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|February 28, 2017
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Summary

Researchers created a rare lanthanide square molecule using Schiff-base ligands and sodium azide. This molecule exhibits strong ferromagnetic interactions and a record high anisotropy barrier, making it a promising single-molecule magnet.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetism

Background:

  • Single-molecule magnets (SMMs) are crucial for developing high-density data storage and quantum computing.
  • Lanthanide-based complexes are extensively studied for their potential as SMMs due to their large magnetic anisotropy.

Purpose of the Study:

  • To synthesize and characterize a novel lanthanide-based molecular square with azido bridges.
  • To investigate the magnetic properties, specifically ferromagnetic interactions and magnetic anisotropy, of the synthesized complex.

Main Methods:

  • Self-assembly of a ditopic Schiff-base ligand (H2L) with lanthanide ions and sodium azide (NaN3).
  • Structural characterization of the resulting azido-pinned interlocking lanthanide square.
  • Magnetic susceptibility measurements to determine magnetic interactions and anisotropy barrier.

Main Results:

  • Successful synthesis of a rare end-to-end azido-pinned interlocking lanthanide square.
  • Observation of significant ferromagnetic interactions within the molecular square.
  • A record high anisotropy barrier of 152(4) K was achieved in the absence of an external direct current (dc) field.

Conclusions:

  • The synthesized lanthanide square represents a new structural motif for SMMs.
  • The observed ferromagnetic coupling and high anisotropy barrier highlight the potential of azido-bridged lanthanide complexes for magnetic applications.