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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Multifunctional Ni(II)-Based Metamagnetic Coordination Polymers for Electronic Device Fabrication.

Pravat Ghorai1, Arka Dey2,3, Paula Brandão4

  • 1Department of Chemistry, Jadavpur University, Kolkata 700032, India.

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Two new nickel(II) coordination polymers exhibit semiconductor behavior and function as Schottky diodes. Compound 2 shows enhanced performance, suggesting potential for electrochemical devices and displaying metamagnetic properties.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Solid-State Physics

Background:

  • Schiff base ligands are versatile building blocks for coordination polymers.
  • Coordination polymers with specific metal ions can exhibit interesting electronic and magnetic properties.

Purpose of the Study:

  • To synthesize and characterize novel one-dimensional thiocyanato-bridged nickel(II) coordination polymers.
  • To investigate the electrical conductivity and photoresponsive behavior of these materials.
  • To explore their potential as semiconductor devices and analyze their magnetic properties.

Main Methods:

  • Synthesis of coordination polymers using 8-aminoquinoline-based Schiff base ligands, Ni(II), and thiocyanate.
  • Characterization of crystal structure and conductivity measurements.
  • Fabrication and testing of metal-semiconductor junction devices under varying light conditions.
  • Magnetic measurements including isothermal magnetization and DC/AC susceptibility.

Main Results:

  • Two isostructural one-dimensional coordination polymers, [Ni(L1)(NCS)2] and [Ni(L2)(NCS)2], were synthesized.
  • Both compounds demonstrated semiconductor behavior, with conductivity increasing under photoillumination.
  • Thin film devices exhibited Schottky diode characteristics, with improved rectification ratios under irradiation.
  • Magnetic studies revealed ferromagnetic intrachain and antiferromagnetic interchain interactions, with metamagnetic behavior observed at low temperatures.

Conclusions:

  • The synthesized nickel(II) coordination polymers show promising semiconductor and diode properties, particularly compound 2.
  • These materials are suitable candidates for applications in electrochemical devices.
  • The compounds exhibit complex magnetic behaviors, including metamagnetism and long-range ferromagnetic order.