Abstract
One Zn-Nd complex [Zn2Nd4L2(OAc)10(OH)2(CH3OH)2] (1) was synthesized from Schiff base ligand bis(3-methoxysalicylidene)ethylene-1,2-phenylenediamine (H2L). 1 shows nanoscale rectangular structure with sizes of about 0.8 × 1.1 × 2.8 nm. 1 exhibits typical near-infrared luminescence of Nd(III) under the excitation of UV-visible light. Further study shows that the complex displays luminescent response behavior to anions and nitro explosives, especially with high sensitivity to H2 and 2,4,6-trinitrophenol.
Highlights
Construction of heterometallic d-f nanoclusters has received much interest during recent years because of their unique chemical properties (Peng et al, 2012; Wang et al, 2013; Yang et al, 2014; Andruh, 2015; Wen et al, 2019)
Compared with NIR fluorescent probes based on organic fluorophores (Yuan et al, 2013; Guo et al, 2014), very few NIR luminescent lanthanide complexes with Yb(III), Nd(III), and Er(III) ions have been reported to be used as sensors for the detection (Shi et al, 2019)
The emission intensities at 1,054 nm of 1 are decreased more than 50% when the concentrations of added H2PO2− and TNP are 1.8 and 5.6 μM, respectively, which are much lower than those of other anions and explosives (Supplementary Figures 4, 5). These results indicate that 1 shows high selectivity to H2PO2− and TNP through lanthanide luminescent response
Summary
Construction of heterometallic d-f nanoclusters has received much interest during recent years because of their unique chemical properties (Peng et al, 2012; Wang et al, 2013; Yang et al, 2014; Andruh, 2015; Wen et al, 2019). Compared with NIR fluorescent probes based on organic fluorophores (Yuan et al, 2013; Guo et al, 2014), very few NIR luminescent lanthanide complexes with Yb(III), Nd(III), and Er(III) ions have been reported to be used as sensors for the detection (Shi et al, 2019). Our current research interests are in the design of lanthanidebased complexes with luminescent response to various ions and explosives (Jiang et al, 2018; Shi et al, 2019; Liu et al, 2020). We report here the synthesis and NIR luminescence properties of a Zn-Nd complex [Zn2Nd4L2(OAc)10(OH)2(CH3OH)2] (1) with Schiff base ligand bis(3-methoxysalicylidene)ethylene-1,2-phenylenediamine (H2L, Scheme 1). Hydrogen atoms were included in the structure factor calculation but not refined.
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