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Polymorphic layered copper phosphonates: exfoliation and proton conductivity studies.

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Three novel copper carboxylate-phosphonates exhibit distinct layer structures and antiferromagnetic properties. Exfoliation into 2D nanosheets reduces proton conductivity, with α-Cu-2 showing more favorable conduction than α-Cu-1.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Polymorphism in metal-organic frameworks (MOFs) offers tunable properties.
  • Carboxylate-phosphonate ligands enable diverse coordination chemistries and layered structures.
  • Understanding structure-property relationships is crucial for designing functional materials.

Purpose of the Study:

  • To synthesize and characterize three new polymorphic copper carboxylate-phosphonates.
  • To investigate their crystal structures, magnetic properties, and proton conductivity.
  • To explore their exfoliation behavior and the impact on conductivity.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Magnetic susceptibility measurements to probe magnetic interactions.
  • Proton conductivity measurements.
  • Exfoliation in tetrahydrofuran (THF) to produce 2D nanosheets.

Main Results:

  • Three distinct polymorphic copper carboxylate-phosphonates (α-Cu-1, α-Cu-2, β-Cu) were synthesized.
  • Different layer topologies were observed, featuring corner-shared {CuO4}/{CuO5} and {PO3C} units.
  • Antiferromagnetic interactions were dominant in all compounds.
  • Exfoliation yielded 2D nanosheets, but decreased proton conductivity.
  • Proton conduction was more favorable in α-Cu-2 compared to α-Cu-1.

Conclusions:

  • The study reveals novel polymorphic copper carboxylate-phosphonates with unique layered structures.
  • Structural variations influence magnetic and proton conductivity properties.
  • Exfoliation into 2D materials impacts conductivity, highlighting the importance of layer integrity for proton transport.