A series of dinuclear lanthanide(III) complexes constructed from Schiff base and beta-diketonate ligands: synthesis, structure, luminescence and SMM behavior

作者：Sun, Ou; Chen, Peng; Li, Hong-Feng; Gao, Ting^*; Sun, Wen-Bin; Li, Guang-Ming; Yan, Peng-Fei^*

来源：CrystEngComm, 2016, 18(24): 4627-4635.

DOI：10.1039/c6ce00354k

• SINGLE-MOLECULE-MAGNET
• INTRAMOLECULAR ENERGY-TRANSFER
• NEAR-INFRARED LUMINESCENCE
• ION MAGNETS
• SALEN-TYPE
• EXCHANGE INTERACTION
• YTTERBIUM COMPLEXES
• DY(III) COMPLEX
• DY-III
• FIELD

A series of new isostructural lanthanide(III) complexes are reported which are constructed from Schiff base and beta-diketonate ligands, namely, [Ln(2)(DBM)(6)(L)] (Ln = Sm (1), Eu (2), Gd (3), Dy (4), Yb (5); L = N, N'-bis(pyridin-2-ylmethylene) ethane-1,2-diamine, DBM = dibenzoylmethanide). The structures of the isomorphous complexes 1-5 were determined by single-crystal X-ray crystallography. The two Ln(III) ions in the molecules of 1-5 are bridged by a Schiff base ligand that displays a curved configuration. Complexes 1, 2 and 5 exhibit lanthanide ion-based luminescence not only in the solid state but also in methanol solution. The lifetimes and quantum yields of luminescence were also determined. The magnetic analysis reveals that complexes 4 and 5 exhibit field-induced single-molecule magnet behavior with energy barriers (Ueff/k(B)) of 46.8 and 23.0 K at direct current fields of 2000 Oe, respectively.

• 出版日期2016
• 单位黑龙江大学