Terbium (III) coordination polymer–copper (II) compound as fluorescent probe for time‐resolved fluorescence ‘turn‐on’ detection of hydrogen sulfide

Abstract

With recognition of the biological importance of hydrogen sulfide (H S), we present a simple and effective fluorescent probe for H S using a Tb coordination polymer-Cu compound (DPA/Tb/G-Cu ). Dipicolinic acid (DPA) and guanosine (G) can coordinate with Tb to form a macromolecular coordination polymer (DPA/Tb/G). DPA/Tb/G specifically binds to Cu in the presence of coexisting cations, and obvious fluorescence quenching is observed. The quenched fluorescence can be exclusively recovered upon the addition of sulfide, which is measured in the mode of time-resolved fluorescence. The fluorescence intensities of the DPA/Tb/G-Cu compound enhance linearly with increasing sulfide concentrations from 1 to 30 μM. The detection limit for sulfide in aqueous solution is estimated to be 0.3 μM (at 3σ). The DPA/Tb/G-Cu compound was successfully applied to sense H S in human serum samples and exhibited a satisfactory result. It displays some desirable properties, such as fast detection procedure, high selectivity and excellent sensitivity. This method is very promising to be utilized for practical detection of H S in biological and environmental samples.

Structures and luminescent sensors of mixed‐counterions based salen‐type lanthanide coordination polymers

“…As shown in Table , comparing the detection limit with results from the literature, the complexes 3 and 6 in this work exhibit lower detection limits (1.0 × 10 −3 and 1.1 × 10 −3 , respectively) than those of previously reported, suggesting that the prepared salen‐type lanthanide coordination polymers could be applied to be a convenient and highly sensitive detection of formaldehyde. It is worth noting that luminescent properties of coordination polymers (CPs) are very sensitive to pH, because the different concentration of acids or bases buffered solution may react with metal ions to ruin the CPs framework, or the CPs may be directly dissolved in the buffered solution, which in turns affects the formaldehyde sensitive detection . An example of MOF‐253‐Eu‐TTA luminescent sensor, the Eu 3+ characteristic luminescence intensity is almost unchanged at pH 5–7 due to its stable structure.…”

Visual detection of S2− with a paper‐based fluorescence sensor coated with CdTe quantum dots via headspace sampling

“…Methodology for the detection of S 2− and/or H 2 S mostly includes titrimetry, [ 12 ] chromatography, [ 13,14 ] electrochemical assay, [ 15,16 ] chemiluminescence, [ 17,18 ] fluorescence (FL), [ 19–22 ] and colorimetry, [ 23–26 ] among which FL sensors are particularly attractive because of their high sensitivity, simple operation and rapid response. However, these often require complicated procedures and intricate precursors, especially organic ones, for preparing certain FL probes for sensing particular targets and, in many cases, the obtained probes still suffer from low solubility in aqueous phase, poor biocompatibility and photobleaching during the sensing process.…”

A Six‐Armed Phenhomazine Ligand with a Potential “Turn‐Off” Copper(II) Sensing Capability through Terbium(III) Luminescence Quenching

“…The working principle of most of these sensors is based on the quenching of the lanthanide(III) luminescence by the presence of Cu II ions, through an electron or energy transfer mechanism to/from the excited lumophore and through paramagnetic effects . These processes, when combined with the unique optical properties of lanthanide(III) ions, that is, sharp emission bands, large energy difference between absorption and emission bands, and long luminescence lifetimes, allow the design of “turn‐off” sensors, in which the presence of copper(II) ions is detected through the diminution of the lanthanide(III) luminescence signal . Moreover, some of the lanthanide(III) ions, namely terbium(III) and europium(III), emit in the visible region of the electromagnetic spectrum, and can thus be easily recognized by the naked eye …”