Synthesis of Two New Dinuclear Lanthanide Clusters and Visual Bifunctional Sensing Devices Based on the Eu Cluster

Abstract

The development of visual and multifunctional sensors, and further the fabrication of portable sensing devices is of great importance. Herein, two dinuclear lanthanide clusters are designed, and their accurate molecules are determined to be [Ln2(DFBA)6(dmp)2(H2O)2] (Ln3+ = Eu3+ (1‐Eu) or Tb3+ (1‐Tb), HDFBA = 3,4‐difluorobenzoic acid, dmp = 4,7‐dimethyl‐1,10‐phenanthroline), by single‐crystal X‐ray diffraction. Interestingly, 1‐Eu shows rapid detection of ferrous ions (Fe2+) and acetylacetone (acac), with the limit of detection (LOD) as low as 5.6 and 1.0 ppb, respectively. LOD of 5.6 ppb for Fe2+ is far lower than the standard of World Health Organization (0.3 ppm, SDWA) and Chinese rural water quality standards (0.5 ppm, GB25467‐2010) for drinking water. As far as it is known, 1‐Eu is the most sensitive chemosensor for the detection of acac; the sensing can be discriminated by the naked eyes under 365 nm UV light. Furthermore, portable sensing devices of agarose gel, test paper, and sprayed films on plastic tube, glass, coin, test paper, stone, leaf, carbon rod, and iron sheet surfaces, based on 1‐Eu solution, are fabricated by facile methods, with visual and quick detection of Fe2+ in water under various conditions, and show excellent recyclable sensing performance for acac vapor.

Visual and Real-Time Monitoring of Cd2+ in Water, Rice, and Rice Soil with Test Paper Based on [2 + 2] Lanthanide Clusters

“…The photos are in line with their CIE results ( Tb 2 Tb 2 : 0.3508, 0.5687; Eu 2 Eu 2 : 0.668, 0.3303) (Figure d). The luminescence lifetimes of Tb 2 Tb 2 and Eu 2 Eu 2 monitored at 543 and 615 nm are 0.317 and 0.353 ms (Figure c), respectively . Luminescence quantum yields for Tb 2 Tb 2 and Eu 2 Eu 2 are 10.30 and 8.04%, respectively.…”

“…The luminescence lifetimes of Tb 2 Tb 2 and Eu 2 Eu 2 monitored at 543 and 615 nm are 0.317 and 0.353 ms (Figure 4c), respectively. 70 Luminescence quantum yields for Tb 2 Tb 2 and Eu 2 Eu 2 are 10.30 and 8.04%, respectively. FT-IR spectra show that the absorption peaks of the carbonyl group in the two lanthanide clusters of Tb 2 Tb 2 and Eu 2 Eu 2 are red-shifted, proving the ligand had coordinated with the lanthanide ions successfully (Figure S2).…”

Tetra-Nuclear Cluster-Based Lanthanide Metal–Organic Frameworks as White Phosphor, Information Encryption, Self-Calibrating Thermometers, and Fe2+ Sensors

“…The two bands in the excitation spectrum of TbMOF originate from the two ligands of phen and BTDB, and the small band at about 290 nm originates from phen . At the optimal excitation at 352 nm, TbMOF emits four characteristic strong linear emission peaks in 450–650 nm, which are due to 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 transitions at 480, 540, 575, and 610 nm, respectively (Figure a), − showing high-purity green luminescence (CIE: 0.2146, 0.4743; Figure d). The strongest emission (540 nm) of the 5 D 4 → 7 F 5 transition is selected to monitor its luminescence lifetime, which shows a single exponential decay function and a relatively long luminescence lifetime of 0.348 ms (Figure )e. The photoluminescence quantum yield of TbMOF is 14.64%.…”

Construction of a luminescent eleven-metal Zn(ii)–Tb(iii) nanocluster for rapid and quantitative time-gated detection of guanosine-5-monophosphate and RNA

“…At present, fluorescent sensors have received much attention because of the application in the detection of analytes with a rapid response, and high sensitivity and selectivity. 1–5 The study of analytical technologies for the detection of biological species is significant in medical science. Guanosine-5-monophosphate (GMP) is an important nucleotide, which acts as an intermediate in the synthesis of nucleic acids and plays a vital role in metabolic processes.…”