Turn-on fluorescent sensor based on curcumin@MOF-5 for the sensitive detection of Al<sup>3+</sup>

Zhong, Tianyuan; Li, Donglin; Li, Chen; Zhang, Zhuo; Wang, Guang

doi:10.1039/d2ay00849a

Cited by 18 publications

(9 citation statements)

References 37 publications

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“…Therefore, the excited state electrons of the fluorescent framework can easily transform to the ground state. As a consequence, the inhibition of PET results in an enhancement in ligand fluorescence . The lifetime of the 360 nm emission gradually increased with increasing concentrations of Trp and Glu, whereas the lifetime of the 544 nm emission hardly changed, further confirming the above mechanism (Table S7).…”

Section: Resultsmentioning

confidence: 99%

SCSC Transformation and Post-Synthesis Modification of MOFs with Proton Conduction and Ratiometric Fluorescence-Sensing Properties

et al. 2023

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The modification of metal–organic framework (MOF) materials to facilitate their practical applications is an extremely challenging and meaningful topic. In this work, two stepwise modification strategies for MOFs were conducted. First, we have demonstrated a single-crystal-to-single-crystal (SCSC) transformation from a microporous three-dimensional (3D) MOF to a two-dimensional (2D) coordination polymer (CP). The centrosymmetric [Cd(3-bpdb)(MeO-ip)] n (1) transforms into a chiral [Cd2(3-bpdb)(MeO-ip)2(CH3OH)2] n (2), which is triggered by the reaction time with methanol that acts as a structure-directing agent. The conversion relationship of 1 to 2 at different reaction times was studied in detail. Density functional theory (DFT) calculations clearly state that the irreversible formation of 2 is thermodynamically favorable. Intriguingly, 2 exhibits good proton conduction of 1.34 × 10–3 S cm–1 under 363 K and 98% relative humidity (RH) due to unique H-bond network characteristics. To the best of our knowledge, there are very few cases of 3D to 2D SCSC transformation stimulated by reaction time. The results have important implications for understanding the SCSC transformation mechanism and synthetic chemistry. On the other hand, the lanthanide3+-functionalized hybrids (Ln3+-MOF), Ln3+@1, were continuously prepared by incorporating luminescent Ln3+ ions into the structure of 1 through encapsulating post-synthesis modification (PSM). Tb3+@1 exhibits double emission in water and shows visual ratiometric fluorescence behavior for sensing glutamic acid (Glu), tryptophan (Trp), and Al3+, which is more reliable and accurate than single emission. Our work may not only provide new insights into the multiple modification of MOF materials but also promote the practical application of such materials.

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Section: Resultsmentioning

confidence: 99%

SCSC Transformation and Post-Synthesis Modification of MOFs with Proton Conduction and Ratiometric Fluorescence-Sensing Properties

et al. 2023

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“…An excessive intake of aluminum in the body will disrupt the activities of the central nervous system, cause human dysfunction, and hinder the normal metabolism of calcium and phosphorus. Zhong et al prepared two types of fluorescent curcumin@MOF-5 composites through post-adsorption and one-pot synthesis and applied them to detect Al 3+ ions [ 68 ]. In this method, the fluorescence was quenched by the PET process, and Al 3+ could inhibit the PET process between curcumin and MOFs-5, resulting in the restoration of curcumin fluorescence.…”

Section: Chemosensorsmentioning

confidence: 99%

An Overview of the Design of Metal-Organic Frameworks-Based Fluorescent Chemosensors and Biosensors

et al. 2022

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Taking advantage of high porosity, large surface area, tunable nanostructures and ease of functionalization, metal-organic frameworks (MOFs) have been popularly applied in different fields, including adsorption and separation, heterogeneous catalysis, drug delivery, light harvesting, and chemical/biological sensing. The abundant active sites for specific recognition and adjustable optical and electrical characteristics allow for the design of various sensing platforms with MOFs as promising candidates. In this review, we systematically introduce the recent advancements of MOFs-based fluorescent chemosensors and biosensors, mainly focusing on the sensing mechanisms and analytes, including inorganic ions, small organic molecules and biomarkers (e.g., small biomolecules, nucleic acids, proteins, enzymes, and tumor cells). This review may provide valuable references for the development of novel MOFs-based sensing platforms to meet the requirements of environment monitoring and clinical diagnosis.

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“…Fluorescent MOFs are an important sub−category of MOFs [ 112 , 113 ], and have been widely used in chemical sensing [ 114 , 115 , 116 , 117 ]. The rational selection of metal centers and ligands is necessary when constructing fluorescent MOFs for humidity sensing.…”

Section: Humidity Sensors Based On Mofsmentioning

confidence: 99%

Humidity Sensors Based on Metal–Organic Frameworks

Teng

Zhang

2022

Nanomaterials

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Humidity sensors are important in industrial fields and human activities. Metal−organic frameworks (MOFs) and their derivatives are a class of promising humidity−sensing materials with the characteristics of a large specific surface area, high porosity, modifiable frameworks, and high stability. The drawbacks of MOFs, such as poor film formation, low electrical conductivity, and limited hydrophilicity, have been gradually overcome with the development of material science. Currently, it is moving towards a critical development stage of MOF−based humidity sensors from usability to ease of use, of which great challenges remain unsolved. In order to better understand the related challenges and point out the direction for the future development of MOF−based humidity sensors, we reviewed the development of such sensors based on related published work, focusing on six primary types (impedance, capacitive, resistive, fluorescent, quartz crystal microbalance (QCM), and others) and analyzed the sensing mechanism, material design, and sensing performance involved, and presented our thoughts on the possible future research directions.

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Turn-on fluorescent sensor based on curcumin@MOF-5 for the sensitive detection of Al³⁺

Abstract: Two fluorescent chemosensors based on MOF-5 and curcumin (A-curcumin@MOF-5 and B-curcumin@MOF-5) were designed and synthesized. Two curcumin@MOF-5 materials retained the framework structure of MOF-5 and the fluorescence properties of curcumin....

Cited by 18 publications

References 37 publications

SCSC Transformation and Post-Synthesis Modification of MOFs with Proton Conduction and Ratiometric Fluorescence-Sensing Properties

SCSC Transformation and Post-Synthesis Modification of MOFs with Proton Conduction and Ratiometric Fluorescence-Sensing Properties

An Overview of the Design of Metal-Organic Frameworks-Based Fluorescent Chemosensors and Biosensors

Humidity Sensors Based on Metal–Organic Frameworks

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Turn-on fluorescent sensor based on curcumin@MOF-5 for the sensitive detection of Al3+

Abstract: Two fluorescent chemosensors based on MOF-5 and curcumin (A-curcumin@MOF-5 and B-curcumin@MOF-5) were designed and synthesized. Two curcumin@MOF-5 materials retained the framework structure of MOF-5 and the fluorescence properties of curcumin....

Cited by 18 publications

References 37 publications

SCSC Transformation and Post-Synthesis Modification of MOFs with Proton Conduction and Ratiometric Fluorescence-Sensing Properties

SCSC Transformation and Post-Synthesis Modification of MOFs with Proton Conduction and Ratiometric Fluorescence-Sensing Properties

An Overview of the Design of Metal-Organic Frameworks-Based Fluorescent Chemosensors and Biosensors

Humidity Sensors Based on Metal–Organic Frameworks

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Turn-on fluorescent sensor based on curcumin@MOF-5 for the sensitive detection of Al³⁺