A new luminescent lanthanide supramolecular network possessing free Lewis base sites for highly selective and sensitive Cu2+ sensing?
Photochemical & Photobiological Sciences Pub Date: 2016-04-26 DOI: 10.1039/C6PP00059B
Abstract
A series of new lanthanide complexes, formulated as [Ln2(DCSAL)3(H2O)11]·3DCSAL·4H2O [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 π–π 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.
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Journal Name：Photochemical & Photobiological Sciences
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CAS no.: 89640-58-4
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