High-Nuclearity Cd(II)–Nd(III) Nanowheel with NIR Emission Sensing of Metal Cations and Nitro-Based Explosives

作者：Yanan Ma, Xiaoping Yang, Mengyu Niu, Wenxin Hao, Dongliang Shi, Desmond Schipper · 发表于：Crystal Growth & Design · 年份：2021 · DOI：10.1021/acs.cgd.0c01742 · 被引用次数：11 · 研究领域：Lanthanide and Transition Metal Complexes、Nanocluster Synthesis and Applications、Luminescence Properties of Advanced Materials

One Cd–Nd nanowheel [Cd 8 Nd 4 L 8 (OAc) 8 ]·4OH ( 1, molecular sizes: 1.2 × 2.8 × 2.8 nm) was obtained by using one designed flexible Schiff base ligand containing eight coordination sites. The Schiff base ligand exhibits a hexadentate η 1:η 2:η 1:η 1:η 2:η 1:μ 4 coordination mode. The chromogenic Cd/L components are able to transfer energy to Nd(III), leading to the near-infrared (NIR) lanthanide emission of 1 . The energy transfer efficiency (η sens ) is calculated to be 39.4%. 1 shows interesting luminescent sensing activity toward metal cations and nitro-based explosives, in particular to Cu(II), Fe(III), Co(II), and 2,4,6-trinitrophenol (TNP) with high sensitivity. The quenching constants of the complex toward Cu(II), Fe(III), Co(II), and TNP respectively are 8.6 × 10 4, 6.8 × 10 4, 6.5 × 10 4, and 2.1 × 10 5 M –1 . The luminescent sensing of the nanowheel to metal cations is able to be explained by chelation enhancement of the quenching (CHEQ) effect, and its high selectivityto TNP is caused by the photoinduced electron transfer process and “inner filter effect”, even with the existence of other nitro-based explosives.