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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 6
BKCSDE 25(6)
June 20, 2004 

Crystal Structures and Luminescence Properties of [Ln(NTA)2·H2O]3- Complexes (Ln = Sm3+, Eu3+, Gd3+, Tb3+, Ho3+, and NTA = Nitrilotriacetate)
Jun-Gill Kang*, Hee-Jung Kang, Jae-Sun Jung, Sock Sung Yun, Chong-Hyeak Kim
Rare earth complexes, Crystal structure and symmetry, Luminescence, Quantum yield
Crystal structures of lanthanide complexes with NTA (NTA = nitrilotriacetate) are reported. The complexes of [Ln(NTA)2·H2O]3? (Ln = Sm, Eu, Gd, Tb and Ho) crystallize in the orthorhombic space group Pccn. In the structures, the trivalent lanthanide ions are completely encapsulated via coordination to the two nitrogen atoms and the six carboxylate oxygen atoms of the two NTA ligands, and one water oxygen atoms. The complexes form a slightly distorted capped-square-antiprism polyhedron. Of the complexes, [Eu(NTA)2·H2O]3?, [Tb(NTA)2·H2O]3? and [Dy(NTA)2·H2O]3? excited at the 325 He-Cd line produce very characteristic luminescence features, arising mostly from the f → f transitions. The absolute quantum yields of these complexes are determined at room temperature. Surprisingly, the [Dy(NTA)2·H2O]3? complex is more luminescent than the [Eu(NTA)2·H2O]3? and [Tb(NTA)2·H2O]3? complexes.
852 - 858
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