A Sensor for Trace H2O Detection in D2O

Abstract

PCM-22, a metal-organic framework material comprising triphenylphosphine and Ln 3+ ions (Ln = Pr-Yb), exhibits solid-state luminescence at room temperature. Mixed-metal versions of PCM-22 that contain controlled amounts of Eu 3+ , Gd 3+ , and Tb 3+ function as highly sensitive, broad-scope solid-state sensors that can rapidly identify unknown solvents by providing a unique ''eight-factor'' fingerprint. The sensors allow for immediate solvent identification via color changes that are obvious to the naked eye and also permit quantitative chemical analysis by uncomplicated spectrophotometry. These same materials achieve quantitative detection of H 2 O in D 2 O from 10 to 120,000 ppm. The detection of trace H 2 O is also demonstrated in a range of common solvents, including those incompatible with conventional laboratory titration methods.

Smart lanthanide antennas for sensing water

“…9,10 This effect can be exploited to develop water sensors, paving the way for a new application of lanthanide probes, since reports on the use of this strategy to design water sensors have been very scarce. 2,[11][12][13][14] Even though b-dicarbonyl compounds are among some of the most studied ligands for lanthanides and quinolin-2-ones are among the most widely used sensitizing antennas, [15][16][17][18][19][20] up to date, no quinolin-2(1H)-one-derived antennas capable of assembling directly with lanthanide ions in solution have been described. In general, antennas that directly assemble lanthanide cations are bulky multidentate ligands able to coordinate the cations with a high coordination number.…”

Advanced Signal-Amplification Strategies for Paper-Based Analytical Devices: A Comprehensive Review

“…This sensor can serve as a dual-sensing mechanism along with luminescence color change via shifted emission (green to yellow) in low water content and can be a turn-off method in high water content. Such a 2D nanosheet-sensing platform was applied to a paper test strip for ease of water detection with a rapid response (<30 s), long-term stability, pH stability, good reusability, high selectivity, broad-range detection (0-50% v/v), and a low LOD value (0.25% v/v) that is considerably lower than the conventional MOF-based sensing platform [83]. The recent improvements in materials and nanotechnologies have created new opportunities to further enhance luminescence signals through numerous strategies, including the use of proper labeling agents, a choice of fabrication process, or the use of an electrical energy supply.…”

Mono- and Mixed Metal Complexes of Eu3+, Gd3+, and Tb3+ with a Diketone, Bearing Pyrazole Moiety and CHF2-Group: Structure, Color Tuning, and Kinetics of Energy Transfer between Lanthanide Ions

“…This is facilitated by both a profound understanding of the luminescence physics of monometallic compounds and diverse applications of MMLC. Such compounds exhibit properties of "luminescent thermometers" [44,45] and also can act as chemical sensors [10,46,47] and color-tunable emitting materials [48][49][50]. The relative proximity of the excited state energies of Eu 3+ (~17,240 cm er1 ) and Tb 3+ (~20,400 cm −1 ) and the relatively small metal-to-metal distances in most common structures [51] cannot only provide two independent luminescence processes for each of the ions but also allow the transfer of excitation energy from Tb 3+ ions to Eu 3+ .…”