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Strong and Switchable Magneto-Optical Effect in Air-Stable Chiral DyIII Complexes with Magnetic Anisotropy
Yuewei Wu1, Ze-Yu Ruan2, Chengcheng Zhang3
1Frontiers Science Center for New Organic Matter, State Key Laboratory of Advanced Chemical Power Sources and Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, China.
Journal of the American Chemical Society
|June 3, 2025
Summary
Researchers developed chiral dysprosium (DyIII) complexes exhibiting strong magneto-optical (MO) effects. These air-stable complexes show reversible switching of circular dichroism signals with magnetic fields, offering insights into MO phenomena.
Area of Science:
- Coordination Chemistry
- Magneto-Optical Materials
- Lanthanide Complexes
Background:
- Achieving strong magneto-optical (MO) effects requires precise molecular-level assembly of chiral and magnetic units, particularly for lanthanide complexes.
- The f-f electronic transitions in lanthanides are typically governed by selection rules, posing significant challenges for observing MO responses.
- Air-stable chiral magnetic complexes are crucial for practical applications but are difficult to synthesize.
Purpose of the Study:
- To synthesize novel, air-stable chiral dysprosium(III) complexes with tailored chelating chiral ligands.
- To investigate the magneto-optical properties, specifically magnetic circular dichroism (MCD) and circular dichroism (CD), of these complexes.
- To explore the influence of magnetic anisotropy on MO effects at room temperature across a broad spectral range.
Main Methods:
- Synthesis of two chiral DyIII complexes (1-R and 1-S) using tailored chelating chiral ligands.
- Characterization of magnetization dynamics over a wide temperature range.
- Measurement of magnetic circular dichroism (MCD) and circular dichroism (CD) spectra.
- Investigation of the effect of external magnetic fields on CD signals.
Main Results:
- The synthesized DyIII complexes exhibit remarkable MO responses attributed to f-f transitions in the visible-near-infrared (vis-NIR) region.
- The study reports the first experimental observation of room-temperature CD peaks for DyIII f-f transitions at 450 nm.
- CD signals in the 700-1100 nm range demonstrate reversible switching upon application of external magnetic fields.
- Strong magnetic anisotropy of the DyIII center is identified as the key factor for the observed strong MO effect.
Conclusions:
- This work presents a facile method for constructing air-stable magnetic and chiral DyIII complexes.
- The findings provide crucial insights into the relationship between magnetic anisotropy and strong MO effects in lanthanide complexes.
- The developed complexes show potential for applications requiring tunable MO responses at room temperature.
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