Luminescence spectroscopy of Eu(Bis-tris)(3+) complexes in anhydrous DMF [Bis-tris=2,2-bis(hydroxymethyl)-2,2 ',2 ''-nitrilotriethanol]: luminescencequenching rate constants for the D-5(0) state of Eu3+ by DMF and polyalcoholic OH groups

Citation
Hs. Son et al., Luminescence spectroscopy of Eu(Bis-tris)(3+) complexes in anhydrous DMF [Bis-tris=2,2-bis(hydroxymethyl)-2,2 ',2 ''-nitrilotriethanol]: luminescencequenching rate constants for the D-5(0) state of Eu3+ by DMF and polyalcoholic OH groups, J CHEM S DA, (9), 2001, pp. 1524-1528
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
ISSN journal
1472-7773 → ACNP
Issue
9
Year of publication
2001
Pages
1524 - 1528
Database
ISI
SICI code
1472-7773(2001):9<1524:LSOECI>2.0.ZU;2-X
Abstract
Excitation and emission spectra and luminescence lifetimes of Eu3+ complexe s obtained by dissolving anhydrous EuCl3 and EuCl3/2,2-bis(hydroxymethyl)-2 ,2',2"- nitrilotriethanol (Bis-tris) in anhydrous dimethylformamide (DMF) a nd those from a Eu(Bis-tris)(2)Cl-3 crystalline sample have been studied. T wo distinct Eu3+ complexes were observed when anhydrous EuCl3 was dissolved in anhydrous DMF, and one was interpreted as an outer-sphere complex of Cl - anion. Dissolution of an excess amount of vacuum dried NaClO4 or KPF6 in anhydrous DMF resulted in longer luminescence lifetimes, presumably reducin g the effects of trace amounts of water in the solvent due to competitive b inding of the water in the solvent by alkali metal cations. The quenching r ate constant for the D-5(0) state of Eu3+ ion by each complexed DMF molecul e in solution and by each OH group in the Bis-tris from the Eu(Bis-tris)(2) Cl-3 crystalline sample were 54 +/-1 and 495 +/-5 s(-1), respectively, and these were used to interpret the plausible structures of the different Eu3 complexes in the EuCl3/Bis-tris/DMF solution.