A new luminescent lanthanide supramolecular network possessing free Lewis base sites for highly selective and sensitive Cu2+ sensing

作者：Chu, Tianshu; Hu, Yunsong; Wu, Jinlun; Zeng, Chenghui; Yang, Yangyi^*; Ng, Seik Weng

来源：Photochemical and Photobiological Sciences, 2016, 15(6): 744-751.

DOI：10.1039/c6pp00059b

• ORGANIC FRAMEWORK
• MOF HYBRIDS
• METAL-IONS
• COMPLEXES
• COPPER
• SPECTROMETRY
• EMISSION
• ELEMENTS
• CELLS
• WATER

A series of new lanthanide complexes, formulated as [Ln(2)(DCSAL)(3)(H2O)(11)]center dot 3DCSAL center dot 4H(2)O [Ln = Eu (1), Gd (2) and Tb (3); DCSAL = 3,5-dichlorosalicylate], have been synthesized and characterized by single crystal X-ray analysis. They are dinuclear clusters and form a 3D supramolecular network via pi-pi stacking and halogen bonding interactions. 3 exhibits strong Tb characteristic emission, whose quantum yield is as high as 38%. Due to binding with Cu2+ ions via its Lewis acid-base interactions, 3 displayed a high selectivity and sensitivity for Cu2+ detection based on Tb3+ emission quenching. The possible quenching mechanism was further proved to be a static quenching mechanism by Stern-Volmer plots and UV-vis spectrum. More importantly, the binding constant between 3 and Cu2+ is also calculated by the Benesi-Hildebrand method, which is helpful for quantitative analysis.

• 出版日期2016
• 单位江西师范大学; 中山大学