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A three-dimensional ferromagnet based on linked copper-azido clusters.

Zhi-Guo Gu1, Jing-Lin Zuo, Xiao-Zeng You

  • 1Coordination Chemistry Institute and the State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, PR China.

Dalton Transactions (Cambridge, England : 2003)
|September 11, 2007
PubMed
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Two novel copper coordination polymers with unique structures were synthesized. Magnetic studies revealed ferromagnetic ordering in one and complex magnetic interactions in the other, mediated by azide bridges.

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Exploration of novel coordination polymers with diverse metal clusters.
  • Investigating the role of azide ligands in magnetic coupling.
  • Synthesis of three-dimensional frameworks using copper(II) ions and diamine ligands.

Purpose of the Study:

  • To synthesize and characterize two new 3D coordination polymers of copper(II).
  • To elucidate the molecular structures of the synthesized complexes.
  • To investigate the magnetic properties and coupling mechanisms within these novel frameworks.

Main Methods:

  • Self-assembly reactions involving copper(II) nitrate, sodium azide, and diamine ligands (N-ethylethylenediamine and 1,2-diaminopropane).
  • Single-crystal X-ray diffraction for detailed molecular structure determination.

Related Experiment Videos

  • Magnetic susceptibility measurements and data fitting to analyze magnetic interactions.

    • Main Results:

    • Successful synthesis of two novel 3D coordination polymers: [Cu(6)(N(3))(12)(N-Eten)(2)](n) (1) and {[Cu(9)(N(3))(18)(1,2-pn)(4)].H(2)O}(n) (2).
    • Complex 1 features hexanuclear copper(II) clusters with diverse azide bridging modes (μ-1,1, μ-1,3, and μ-1,1,3).
    • Complex 2 exhibits octanuclear copper-azido clusters and [Cu(diamine)(2)](2+) units, showing ferromagnetic ordering at 3.5 K and complex magnetic interactions.

    Conclusions:

    • The synthesized coordination polymers demonstrate intricate structural diversity based on multinuclear copper clusters.
    • Azide bridges play a crucial role in mediating ferromagnetic coupling between copper(II) ions in complex 1.
    • The study highlights the potential of copper-azido systems in developing materials with tunable magnetic properties.