Crystal Structures of Ln(III) (Ln = La, Pr, Nd, Sm, Eu, and Gd) Complexes with N,N,N′,N′-Tetraethyldiglycolamide Associated with Homoleptic [Ln(NO3)6)]3

• Published in: Bulletin of the Chemical Society of Japan Vol. 87; no. 2; pp. 294 - 300
• Main Authors: Kawasaki, Takeshi, Okumura, Shin, Sasaki, Yuji, Ikeda, Yasuhisa
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 15.02.2014; Chemical Society of Japan
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.20130259

Novel lanthanoid(III) (Ln(III)) complexes with N,N,N′,N′-tetraethyldiglycolamide (TEDGA), [Ln(TEDGA)3][Ln(NO3)6] (Ln = La, Ce, Pr, Nd, Sm, Eu, and Gd), have been synthesized and characterized crystallographically. The crystal structures of these complexes are constructed by the packing of [Ln(TEDGA)3]3+ cations and [Ln(NO3)6]3− anions. The [Ln(TEDGA)3]3+ cations exhibit distorted tricapped trigonal prismatic geometry, in which Ln(III) ions are coordinated by nine oxygen atoms from three tridentate TEDGA ligands. The [Ln(NO3)6]3− anions have distorted icosahedral geometry, where Ln(III) ions are coordinated by twelve oxygen atoms from the six bidentate nitrate ligands. The Ln–O bond lengths tend to increase in the following order, Ln–Onitrate > Ln–Oether > Ln–Ocarbo. Each Ln–O bond length becomes gradually short according to the lanthanoid contraction.