A metal–organic gel‐based fluorescent chemosensor for selective Al³⁺ detection

Abstract

As an important metal element, aluminium has a significant impact on the environment and human health, and thus the detection of Al 3+ has become the subject of much research. We synthesized a Ni(II)-based metal-organic gel (Ni-MOG), which can serve as an Al 3+ fluorescence sensor with high selectivity and sensitivity, the limit of detection being calculated to be 0.5 μM. In addition, a composite film was further fabricated by hybridization of this Ni-MOG with poly(vinyl alcohol). The composite film produced a rapid fluorescence response to Al 3+ solutions at concentrations above 5 × 10 −5 M in 5 min. The Ni-MOG composite film can also be successfully applied for the sensitive detection of Al 3+ in real samples of tap water and seawater. The effective detection of Al 3+ described in this contribution provides a new insight into water quality monitoring and has promising application value.

Synthesis of Dansyl Cyclen and Preliminary Study of Its Fluorescent Properties

“…The absorption peak at 1318 cm -1 represents the infrared frequency of the asymmetric SO2 stretching frequency (υasSO2). This is in good agreement with Wang [15] and Xue [16].…”

Hierarchical porous metal–organic gels and derived materials: from fundamentals to potential applications

“…In addition to MOFs, the gel formation by crosslinking the MOP molecules has also gained considerable attention and a large variety of gels have been synthesized using this approach, as noted by us in Section 2.2.3. Often Pristine-MOGs remain limited in their applicability and processability, driving the field to move towards 437 Copyright 2019, John Wiley & Sons, Inc. Variation in the fluorescence intensity of Cu 0.5 /Co 0.5 -MOG + TPA upon addition of increase concentration of (c) H 2 O 2 (0-400 mM) and (d) glucose (0-120 mM), in phosphate buffer.…”

“…In a recent report of Gu and co-workers, the sensing of Al 3+ ions was shown by a Ni-MOG based on Ni 2+ ions, 4,4 0 -bipyridine and 1,3,6,8-tetra(4-carboxylphenyl)pyrene. 437 The organic chromophores in the ligand endowed the Ni-MOG with a broad band fluorescence emission with a maximum at 440 nm. Specifically, this band was quenched by Al 3+ ions in the spectrum and at the same time a new emission band was observed at 480 nm.…”

“…Inset shows the visible colour change of the Ni-MOG in the presence of Al 3+ ions. Reproduced with permission 437. Copyright 2019, John Wiley & Sons, Inc.…”

Luminescent Detection of Cr(VI) and Mn(VII) Based on a Stable Supramolecular Organic Framework

“…In recent years, crystalline materials have attracted great interest because of their wide variety of structures and potential applications including storage and separation, − sensing, − drug delivery, − etc. Among them, supramolecular organic frameworks (SOFs), which are mainly constructed from the assembly of molecules blocks through noncovalent interactions (e.g., hydrogen bonds, π–π interaction, CH−π interaction, and so on), have attracted great attention. , This kind of crystal material is investigated in the field of gas storage and separation, and a stimulated response such as light, thermal, and pressure. − SOFs can be endowed with different properties as the functional organic constitutions are adopted.…”