A Luminescent Dinuclear Eu-III/Tb-III Complex with LMCT Band as a Single-Molecular Thermosensor

作者：Yanagisawa Kei; Kitagawa Yuichi; Nakanishi Takayuki; Seki Tomohiro; Fushimi Koji; Ito Hajime; Hasegawa Yasuchika^*

来源：Chemistry - A European Journal, 2018, 24(8): 1956-1961.

DOI：10.1002/chem.201705021

• charge transfer
• lanthanides
• luminescence
• O ligands
• sensors

Temperature-dependent luminescence of a dinuclear Eu-III/Tb-III complex with a seven-coordinate structure is demonstrated. The dinuclear complex is composed of two lanthanide ions, six tetramethylheptanedionate ligands, and a bidentate phosphine oxide linker ligand. The dinuclear structure of the complex was characterized by single-crystal XRD. Intrinsic 4f-4f emission quantum yields of the dinuclear Eu-III and Tb-III complexes were 66 and 61%, respectively. The luminescence color of the dinuclear Eu-III/Tb-III complex changed from red to green with increasing temperature. The thermosensing range based on the ratio of luminescence intensity (A(Eu)/A(Tb)) was 100-450K. The temperature-dependent luminescence is due to the presence of a ligand-to-metal charge-transfer state.

• 出版日期2018-2-6