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

Author(s)

Cabral, F. M. ^[1] ; Galico, D. A. ^[1] ; Mazali, I. O. ^[1] ; Sigoli, F. A. ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Inst Chem, Lab Funct Mat, POB 6154, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: Inorganic Chemistry Communications; v. 98, p. 29-33, DEC 2018.
• Web of Science Citations: 4

Abstract

In this work, we synthesized the [tris(thenoyltrifluoroacetone)pyrazino {[}2,34] {[}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 D(4)d 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 D-5(0) -> F-7(0) transition band indicates the presence of the electron-phonon coupling in this complex. (AU)

• FAPESP's process: 14/50906-9 - INCT 2014: in Functional Complex Materials
• Grantee: Fernando Galembeck
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
• Grantee: Lauro Tatsuo Kubota
• Support Opportunities: Research Projects - Thematic Grants