Crystal structure and temperature dependence of the photophysical properties of the [Eu(tta)3(pyphen)] complex

• Published in: Inorganic chemistry communications Vol. 98; pp. 29 - 33
• Main Authors: Cabral, F.M., Gálico, D.A., Mazali, I.O., Sigoli, F.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2018
• Subjects: Crystal structure; Electron-phonon coupling; Europium (III) complex; Luminescent thermometer; Electron-phonon coupling; Europium (III) complex; Luminescent thermometer; Crystal structure
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2018.09.041

In this work, we synthesized the {tris(thenoyltrifluoroacetone)pyrazino[2,3-f][1,10]phenanthroline}europium (III) complex and studied its thermal emission quenching. The crystal structure of the [Eu(tta)3(pyphen)] complex show that the europium (III) ion occupies a distorted D4d symmetry of a square antiprism site. The complex shows an absolute emission quantum yield of 43.3 ± 1.2. The temperature dependence of the photophysical properties of the complex was evaluated and indicates that the complex has potential to be applied as a lifetime based luminescent thermometer. The quenching of the luminescence as a function of temperature occurs due the energy back-transfer from the emitter state to the ligand centered triplet state. The temperature induced blue-shift in the 5D0 → 7F0 transition band indicates the presence of the electron-phonon coupling in this complex. [Display omitted] •Europium (III) complex showing absolute emission quantum yield of 31%•Temperature dependence of emission lifetime•Luminescent molecular temperature-probe in the 283–323 K range•The complex showing electron-phonon coupling