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
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
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.