A series of novel lanthanide complexes with 2-bromine-5-methoxybenzoic acid and 2,2 '-bipyridine: Syntheses, crystal structures, and luminescent properties

作者：Zhao, Qing-Qing; Zhu, Min-Min; Ren, Ning^*; Zhang, Jian-Jun^*

来源：Journal of Molecular Structure, 2017, 1149: 171-182.

DOI：10.1016/j.molstruc.2017.07.080

• Lanthanide complexes
• Crystal structure
• Thermal analysis
• Luminescence
• Antibacterial activity

Six new lanthanide complexes [Ln(2-Br-5-MOBA)(3)(2,2'-DIPY)](2) (Ln = Nd(1), Eu(2), Gd(3), Tb(4), Ho(5), Er(6); 2-Br-5-MOBA = 2-bromine-5-methoxybenzoate; 2,2'-DIPY = 2,2'-bipyridine) have been successfully synthesized and characterized. The complexes 1-5 are isostructural and nine-coordinated by the single-crystal X-ray diffraction analyses, while the complex 6 is eight-coordinated. The difference of crystal structure may be the result of the lanthanide contraction effect. The binuclear units were further assembled into 1D, 2D, 3D supramolecular structures by the pi-pi stacking and C-H center dot center dot center dot O hydrogen bonding interactions. The thermal decomposition mechanism of complexes 1-6 was studied by TG analysis and further authenticated by TG/DSC-FTIR techniques. The solid-state luminescence properties of complexes 2 and 4 were investigated at room temperature. The results indicate that complexes 2 and 4 show characteristic emission of Eu3+ ion and Tb3+ ion, respectively. What's more, the title complexes have good antibacterial activities against Candida albicans.

• 出版日期2017-12-5
• 单位邯郸学院; 河北师范大学