A series of Ln(2) complexes based on an 8-hydroxyquinoline derivative: slow magnetization relaxation and photo-luminescence properties

作者：Chu, Xiao-Ya; Zhang, Hong-Xia; Chang, Yi-Xin; Nie, Yao-Yao; Cui, Jian-Zhong^*; Gao, Hong-Ling^*

来源：New Journal of Chemistry, 2018, 42(8): 5688-5697.

DOI：10.1039/c7nj04942k

• SINGLE-MOLECULE MAGNET
• LANTHANIDE(III) DINUCLEAR COMPLEXES
• SCHIFF-BASE
• DY-III
• YB ARRAYS
• LUMINESCENCE
• BEHAVIOR
• DYSPROSIUM(III)
• DYNAMICS
• LN

The reactions of 2-[(4-bromo-phenylimino)-methyl]-quinolin-8-ol (HL) and Ln(hfac)(3)center dot 2H(2)O (Ln(III) = Pr, Gd, Tb, Dy, Ho, Er, Lu; hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate) precursors lead to the formation of seven lanthanide complexes with the formula of [Ln(2)(hfac)(4)L-2] (Ln = Pr (1); Gd (2); Tb (3); Dy (4); Ho (5); Er (6); Lu (7)). The X-ray structural analysis shows that complexes 1-7 are phenoxo-bridged dinuclear complexes. The luminescence spectra in methanol solution show that complex 3 exhibits a characteristic Tb(III) centered luminescence, while complex 7 exhibits emission bands similar to that of the ligand. In addition, the magnetic properties of 2- 6 are studied: the maximum value of -Delta S-m for complex 2 is 15.00 J K-1 kg(-1), while complex 4 shows a slow magnetic relaxation behaviour with an energy barrier of 4.25 K and a pre-exponential factor of 6.55 x 10(-6) s.

• 出版日期2018-4-21
• 单位天津大学; 南开大学