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Amplified electron-spin thermal sensitivity in Mn(II) complexes.

Anthony J Campanella1, Amanda Gin1, Siyoung Sung1

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Ligand choice controls the temperature sensitivity of electron paramagnetic resonance (EPR) spectra in manganese(II) complexes. This molecular tuning offers enhanced performance for spin applications like quantum sensing.

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Area of Science:

  • Spin chemistry
  • Quantum sensing
  • Materials science

Background:

  • Temperature sensitivity of magnetic resonance properties is crucial for spin applications.
  • Molecular tuning can modify the temperature dependence of electron paramagnetic resonance (EPR) spectra.

Purpose of the Study:

  • To demonstrate that ligand choice can control the temperature dependence of EPR spectra.
  • To investigate the effect of ligand modification on the zero-field splitting parameter (D) in Mn(II) complexes.

Main Methods:

  • Preparation and analysis of three different encapsulated Mn(II) complexes.
  • High-field, high-frequency EPR spectroscopy to study spectral variations with temperature.

Main Results:

  • EPR spectra of all complexes showed temperature-dependent width variations.
  • Ligand shell significantly altered thermal sensitivities of the zero-field splitting parameter (D), ranging from 2.2 to 9.8 MHz K⁻¹.
  • Achieved significant enhancement compared to the nitrogen vacancy center in diamond (approx. 74 kHz K⁻¹).

Conclusions:

  • Ligand selection is an effective strategy for tuning the temperature dependence of the zero-field splitting parameter (D) in Mn(II) complexes.
  • This molecular tuning capability shows promise for developing novel molecular thermometers and quantum sensing platforms.