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Multicolour lanthanide(III) porous 1D coordination polymers: tunable wide spectrum emission and efficient Cu sensing. | LitMetric
Five isostructural 1D porous coordination polymers (PCPs) with a general formula of {[M(L)(DMF)(HO)]·1.5HO} [M = Tb (1), Eu (2), Yb (3), Nd (4) and Er (5)] have been synthesized using a flexible tripodal organic linker (L) and characterized. Tb (1) and Eu (2) PCPs exhibit metal-based green and red emission, respectively, whereas Yb (3), Nd (4) and Er (5) PCPs show near-infrared (NIR) emission. Doping Eu in 1 in a precisely controlled stoichiometric amount leads to different mixed lanthanide PCPs, {[TbEu(L)(DMF)(HO)]·1.5HO} (1a-1f) that show tunable emission including that of bright white light. The PCPs decorated with Lewis basic -O- binding sites make them potential candidates for the binding and selective sensing of traces of Cu ions, and this is illustrated for PCP 2 (limit of detection = 0.69 ± 0.02 ppm). The photoluminescence of 2 can be recovered by the introduction of a chelating ligand ethylenediaminetetraacetic acid (EDTA) without any structural disintegration, indicating the potential of the lanthanide PCPs for future sensing applications.
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