The construction of a novel luminescent lanthanide framework for the selective sensing of Cu²⁺ and 4-nitrophenol in water

Abstract

Two water stable Ln-MOFs that take the (4,4,4)-connected nets with unprecedented topology symbol of {42·6·83}2{42·62·82}{42·84} were developed for sensing Cu2+ and 4-NP in aqueous media with high selectivity and sensitivity.

Two luminescent film sensors constructed from new lanthanide coordination polymers for ratiometric detection of Zn2+ and NH3 in water and their white emission properties

“…However, excellent ratiometric luminescent sensors for Zn 2+ , especially those that could be used in water media and those for NH 3 , have rarely been documented because of the challenges in design and synthesis because fluorescence ratio sensors require not only two potential emission centers, but also opposite changes in the intensity of the two emission centers triggered by the analytes. 11,12 Lanthanide coordination polymers (LnCPs) mean that some photoactive Ln 3+ ions are introduced into the polymer host for characteristic luminescent functionalization due to their excellent optical properties, 13–16 such as long luminescent lifetime, narrow and sharp emission and large Stokes shift, which also makes them widely used in ratiometric sensing. 17–19 Among many organic ligands for constructing luminescent LnCPs, multi-monodentate salicylamide ligands have shown advances in structural diversity and excellent sensitizing performance because they not only have salicylamide chromophores to sensitize the emission of Eu 3+ and Tb 3+ as a result of their better energy matching, but they also possess chelating flexibility due to their multi-monodentate features.…”

Dye‐encapsulated nanocage‐based metal–organic frameworks as luminescent dual‐emitting sensors for selective detection of inorganic ions

“…In order to further explore the sensing process to the analytes, it was performed the XPS of the composites before and after immersion in Cu (II) or Fe (III) DMF solution as well as the UV–vis absorption spectra of the composites in different metal ions DMF solution. As shown in Figures S11a and S18, the typical peaks of Cu 2p (934.4 and 954.1 eV) appeared in the spectrum of the material immersed in Cu (II) solution, indicating that there is an interaction between Cu (II) and P2R@Zn‐MOF 60 . In addition, the shift of N 1s peak from 398.3 to 398.1 eV indicates the weak binding of pyridine nitrogen to Cu (II), which may lead to the electrons transfer from the ligands in framework to Cu (II), resulting in luminescence quenching 61 .…”

A hydrostable CuII coordination network prepared hydrothermally as a “turn-on” fluorescent sensor for S2− and a selective adsorbent for methylene blue

“…Ligand H 4 L was obtained according to a previous report. 31 The particular materials, instrumentation, crystallographic data collection, refinement and synthesis procedure of CuCP are described in the ESI. † 2.1.…”

“…The reported results clearly indicate that the coordination mode of H 4 L could be modulated effectively by metal ions. 31,32 In view of the above considerations, H 4 L was further selected to afford a 2D copper coordination network, [Cu 2 L(H 2 O) 2 ] n (CuCP), hydrothermally (Scheme 1) based on the following considerations:…”