Wydział Chemii

Przemysław Starynowicz

2003

Polyhedron

22

2761-2765

10.1016/S0277-5387(03)00452-2

Naukowa

Angielski

Artykuł

The article presents two complexes of divalent Eu with nitrilotriacetic acid. The first of them, polymeric trisaqua(nitrilotriacetato)sesquieuropium hydrate, [(C₆H₆NO₆)(H₂O)₃Eu_3/2]·H₂O, precipitates during electrochemical reduction from acidic solution. There are two independent Eu²⁺ cations: one is 8-coordinate (six carboxylic oxygen atoms and two water molecules), whereas the other is nine-coordinate (four carboxylic oxygen atoms, four water molecules, and a nitrogen atom). The other complex, hexacaesium bis(nitrilotriacetato)europate(II) dichloride tetrahydrate, Cs₆[(C₆H₆NO₆)₂Eu]Cl₂·4H₂O, obtained in basic environment, is monomeric. Europium is eight-coordinate (six carboxylic oxygen and two nitrogen atoms) and its environment has an approximate S₆ symmetry. The latter compound displays very weak luminescence with maximum at 483 nm at 77 K. Two complexes of Eu(II) with nitrilotriacetic acid have been obtained. One of them is polymeric and the other contains monomeric, fairly symmetric [Eu(nta)₂]⁴⁻ anions. The latter compound shows very weak luminescence with maximum at 483 nm.

Lanthanides, Divalent europium, Nitrilotriacetate, Structures, Spectroscopy

https://doi.org/10.1016/S0277-5387(03)00452-2

http://www.elsevier.com