| Autor: |
Akerboom, Sebastiaan, Hazenberg, E. Tom, Schrader, Ireen, Verbeek, Sarah F., Mutikainen, Ilpo, Fu, Wen Tian, Bouwman, Elisabeth |
| Předmět: |
|
| Zdroj: |
European Journal of Inorganic Chemistry; Oct2014, Vol. 2014 Issue 28, p4896-4906, 11p |
| Abstrakt: |
Europium(III) and terbium(III) complexes have been prepared using the ligands 2-(4,5-dihydro-1,3-oxazol-2-yl)phenol (H L1) and 2-(4,5-dihydro-1,3-thiazol-2-yl)phenol (H L2) in yields ranging between 74 and 100 %. Metal-to-ligand ratios of 1:3 and 1:4 can be achieved, giving rise to compounds with the formulae [Ln2( L)6] and NR4[Ln( L)4], Ln = Eu, Tb. Recrystallisation of the complexes from DMSO resulted in the formation of octanuclear complexes [Na2(Ln( L1)3)2(CO3)(DMSO)2]2 held tightly together by carbonate ions that have been formed from CO2 from the atmosphere. Five structures have been determined, showing a bidentate binding mode of the ligand through the phenolate oxygen and the nitrogen atom of the five-membered ring. Most terbium compounds show bright luminescence upon excitation with near-UV radiation, with quantum yields of 16 % to 79 %. Strong emission is observed for NBu4[Eu( L1)4] and NEt4[Eu( L2)4] with quantum yields of 43 % and 20 %, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
