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Photoinduced metal-to-ligand (or ligand-to-metal) charge-transfer (CT) states in metal complexes have been extensively studied toward the development of luminescent materials. However, previous studies have mainly focused on CT transitions between d- and π-orbitals. Herein, we report the first demonstration of CT emission from 4f to orbitals using a trivalent europium (Eu(III)) complex, supported by both experimental and theoretical analyses. The Eu(III) complex exhibits an eight-coordination structure, comprising three anionic nitrates and two neutral electron-donating ligands containing a carbazole unit. The diffuse reflectance spectrum of the complex displays an absorption band at 440 nm and time-resolved emission analyses reveal a characteristic emission band at 550 nm. Comparative studies employing a Gd(III) complex, alongside quantum chemical analyses, confirm that the observed absorption and emission bands are associated with CT transitions between π and 4f orbitals. The observation of CT emission based on the 4f orbital offers novel insights into the field of molecular luminescence science and technology.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: lanthanide

刊行年月日: 2025-01-28

出版者: Springer Science and Business Media LLC

掲載誌:

• Communications Chemistry (ISSN: 23993669) vol. 8 24

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s42004-025-01420-6

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更新時刻: 2025-05-16 12:30:23 +0900

MDRでの公開時刻: 2025-05-16 12:19:05 +0900