Abstract
Four lanthanide metal-organic frameworks (Ln-MOFs), namely {[Me2NH2][LnL]·2H2O}n (Ln = Eu 1, Tb 2, Dy 3, Gd 4), have been constructed from a new tetradentate ligand 1-(3,5-dicarboxylatobenzyl)-3,5-pyrazole dicarboxylic acid (H4L). These isostructural Ln-MOFs, crystallizing in the monoclinic P21/c space group, feature a 3D structure with 7.5 Å × 9.8 Å channels along the b axis and the point symbol of {410.614.84} {45.6}2. The framework shows high air and hydrolytic stability, which can keep stable after exposed to humid air for 30 days or immersed in water for seven days. Four MOFs with different lanthanide ions (Eu3+, Tb3+, Dy3+, and Gd3+) ions exhibit red, green, yellow, and blue emissions, respectively. The Tb-MOF emitting bright green luminescence can selectively and rapidly (<40 s) detect Fe3+ in aqueous media via a fluorescence quenching effect. The detection shows excellent anti-inference ability toward many other cations and can be easily recognized by naked eyes. In addition, it can also be utilized as a rapid fluorescent sensor to detect acetone solvent as well as acetone vapor. Similar results of sensing experiments were observed from Eu-MOF. The sensing mechanism are further discussed.
Highlights
Environmental and ecological problems have caused widespread concern of scientists in recent years
The forerunners have made great efforts on the recognition of environmentally and biologically relative species based on luminescent lanthanide metalorganic frameworks (Ln-metal-organic frameworks (MOFs)) [35,36]
Most of the MOFs reported for luminescent sensing are applied in nonaqueous media because of their poor hydrolytic stabilities [37]
Summary
Environmental and ecological problems have caused widespread concern of scientists in recent years. The poor stabilities of the structures and the time consumption in the detection limit the further applications of MOFs in luminescent sensing. In light of these facts, we attempt to construct multifunctional Ln-MOFs for sensing in aqueous media conveniently and rapidly. The MOFs demonstrate excellent air and water stabilities as well as colorful luminescence Based on these virtues, a convenient and fast-response luminescent sensor toward the Fe3+ ion in aqueous solution with good anti-inference ability was fabricated. A convenient and fast-response luminescent sensor toward the Fe3+ ion in aqueous solution with good anti-inference ability was fabricated It shows the potential for quickly sensing acetone solvent as well as its vapor in the air. The simplicity, visualization, and high time efficiency of this method make it a competitive dual-functional fluorescent probe
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