Strong NIR-II Magneto-Optical Activity of a Chiral Sm15Cu54 Cage

The magneto-optical response of chiral materials holds significant potential for applications in physics, chemistry, and biology. However, exploration of the near-infrared (NIR) magneto-optical response remains limited. Herein, we report the synthesis and strong NIR-II magneto-optical activity of th...

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Veröffentlicht in:Journal of the American Chemical Society 2024-08, Vol.146 (33), p.22913-22917
Hauptverfasser: Chen, Jia-Nan, Huang, Kai-Xin, Cheng, Pei-Ming, Qi, Ming-Qiang, Xu, Han, Chen, Jiaye, Duan, Yingying, Kong, Xiang-Jian, Zheng, Lan-Sun, Long, La-Sheng
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Sprache:eng
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Zusammenfassung:The magneto-optical response of chiral materials holds significant potential for applications in physics, chemistry, and biology. However, exploration of the near-infrared (NIR) magneto-optical response remains limited. Herein, we report the synthesis and strong NIR-II magneto-optical activity of three pairs of chiral 3d–4f clusters of R/S -Ln 15 Cu 54 (Ln = Sm, Gd, and Dy). Structural analysis reveals that R/S -Ln 15 Cu 54 features a triangular prism cage with C 3 symmetry. Interestingly, magnetic circular dichroism (MCD) spectra exhibit remarkable magneto-optical response in the NIR-II region, driven by the f–f transition. The maximum g-factor of R/S -Sm 15 Cu 54 reaches 5.5 × 10–3 T–1 around 1300–1450 nm, surpassing values associated with DyIII and CuII ions. This remarkable NIR-II magneto-optical activity may be attributed to strong magnetic-dipole-allowed f–f transitions and helix chirality of the structure. This work not only presents the largest Ln-Cu clusters to date but also demonstrate the key role of magnetic-dipole-allowed transitions on magneto-optical activity.
ISSN:0002-7863
1520-5126
1520-5126
DOI:10.1021/jacs.4c07346