A series of new lanthanide complexes with 2-bromo-5-methoxybenzoic acid and 5,5-dimethyl-2,2-bipyridine: Crystal structures, thermal behavior, luminescent and magnetic properties

作者：Wu Xiao-Hui; Ren Ning; Zhang Jian-Jun^*

来源：Applied Organometallic Chemistry, 2018, 32(11): e4528.

DOI：10.1002/aoc.4528

• Crystal structure
• Lanthanide complexes
• Luminescence
• Magnetic properties
• Thermal analysis

Four new binuclear lanthanide complexes [Ln(2-Br-5-MOBA)(3)(5,5-DM-2,2-bipy)](2) (Ln=Gd(1), Tb(2), Dy(3), Er(4); 2-Br-5-MOBA=2-bromo-5-methoxybenzoate; 5,5-DM-2,2-bipy=5,5-dimethyl-2,2-bipyridine) have been successfully synthesized and then further characterized by infrared spectra, single-crystal X-ray diffraction, elemental analyses and Powder X-ray diffraction (PXRD). Complexes 1-3 are isostructure with the coordination number of nine, while the complex 4 is eight-coordinated exhibiting a different structure. Nevertheless, the complexes 1-4 form the same 1D, 2D and 3D supramolecular structures by hydrogen bonding (C-H<bold>Br and C</bold>-H<bold>O</bold>) and - stacking interactions. Thermal behavior of complexes 1-4 was studied by TG/DSC-FTIR techniques. The luminescent spectra of complexes 2 and 3 were investigated at room temperature, which exhibits characteristic luminescence of Tb3+ and Dy3+ ions, respectively. The luminescence decay curve of the complex 2 was measured, which follows double-exponential decay law. The luminescence lifetime of complex 2 is 0.693ms. What's more, the magnetic properties of complexes 1-4 have been investigated by measuring the magnetic susceptibility in the temperature range of 2-300K.

• 出版日期2018-11
• 单位河北师范大学; 邯郸学院