Crystal Structures and Luminescence Properties of [Ln(NTA)2·H2O]3- Complexes (Ln = Sm3+, Eu3+, Gd3+, Tb3+, Ho3+, and NTA = Nitrilotriacetate) 


Vol. 25,  No. 6, pp. 852-858, Jun.  2004
10.5012/bkcs.2004.25.6.852


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  Abstract

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.

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  Cite this article

[IEEE Style]

J. Kang, H. Kang, J. Jung, S. S. Yun, C. Kim, "Crystal Structures and Luminescence Properties of [Ln(NTA)2·H2O]3- Complexes (Ln = Sm3+, Eu3+, Gd3+, Tb3+, Ho3+, and NTA = Nitrilotriacetate)," Bulletin of the Korean Chemical Society, vol. 25, no. 6, pp. 852-858, 2004. DOI: 10.5012/bkcs.2004.25.6.852.

[ACM Style]

Jun-Gill Kang, Hee-Jung Kang, Jae-Sun Jung, Sock Sung Yun, and Chong-Hyeak Kim. 2004. Crystal Structures and Luminescence Properties of [Ln(NTA)2·H2O]3- Complexes (Ln = Sm3+, Eu3+, Gd3+, Tb3+, Ho3+, and NTA = Nitrilotriacetate). Bulletin of the Korean Chemical Society, 25, 6, (2004), 852-858. DOI: 10.5012/bkcs.2004.25.6.852.

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ISSN(Print) 0253-2964
ISSN(Online) 1229-5949