Pre-concentration and energy transfer enable the efficient luminescence sensing of transition metal ions by metal–organic frameworks

Lin, Xinping; Hong, Yahui; Zhang, Chao; Huang, Ruiyun; Wang, Cheng; Lin, Wenbin

doi:10.1039/c5cc06453h

Cited by 58 publications

(37 citation statements)

References 30 publications

(32 reference statements)

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“…UiO‐67(bipy) has been investigated for alternative applications including luminescent sensing of transition metal ions, where the MOF acts as both the chelator and the fluorescence reporter . Of the range of transition metal ions investigated during the study, Mn II , Fe II , Fe III , Cd II , Co II , Cu II , Ni II and Zn II were all found to quench the MOF's intrinsic luminescence, with the most sensitive detection observed for Fe III , at a detection limit of 3.2 parts per billion.…”

Section: Postsynthetic Metalationmentioning

confidence: 99%

Postsynthetic Modification of Zirconium Metal‐Organic Frameworks

2016

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Metal-organic frameworks (MOFs) have been in the spotlight for a number of years due to their chemical and topological versatility. As MOF research has progressed, highly functionalised materials have become desirable for specific applications, and in many cases the limitations of direct synthesis have been realised. This has resulted in the search for alternative synthetic routes, with postsynthetic modification (PSM), a term used to collectively describe the functionalisation of pre-synthesised MOFs whilst maintaining their desired characteristics, becoming a topic of interest. Advances in the scope of reactions performed are reported regularly; however reactions requiring

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Section: Postsynthetic Metalationmentioning

confidence: 99%

Postsynthetic Modification of Zirconium Metal‐Organic Frameworks

2016

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“…Although coordination interaction between Ag + and 2,2′‐bipyridine moieties exists (XPS spectra in Figure S6 in the Supporting Information), the quenching sites are not the coordination bond, according to the fluorescence lifetime study (Figure S8, Supporting Information). These two mechanisms can be differentiated by the fluorescence lifetime study: dynamic quenching will show a comparable decrease in lifetime, while static quenching does not change the lifetime . Therefore, Ag + ‐induced fluorescence quenching of Eu(III)@UMOFs is dynamic quenching, which results from encounter of Ag + and the excited state of ligands.…”

Section: Resultsmentioning

confidence: 99%

Intelligent Molecular Searcher from Logic Computing Network Based on Eu(III) Functionalized UMOFs for Environmental Monitoring

Yan

2017

Adv Funct Materials

106

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By taking advantage of facile preparation and sensitive recognition capacity, the first example of a fluorescence system based on Eu(III) functionalized UiO(bpdc) (UMOFs) has been constructed for effective combination of ions recognition and logic computing. All the ions, including Hg 2+ , Ag + , and S 2− in the system are water harmful, which can be recognized through affecting energy transfer or framework structure. By the self-assembling, competing and connecting with each other, Eu(III)@UMOFs and the ions have achieved the implementation of Boolean logic network system connecting the elementary logic operations (NOR, INH, and IMP) and integrative logic operation (OR + INH), also obtaining computing keypad-lock security system by sequential logic operation. To deal with uncertain information in the analog region of nonlinear response (fluorescence and concentration), soft computation through the formulation of fuzzy logic operation has been constructed. On the basis of Boolean logic and fuzzy logic, one intelligent molecular searcher can be realized by taking chemical events (Hg 2+ , Ag + , and S 2− ) as programmable words and chemical interactions as syntax. Considering the particularity of all the input ions, the approach is helpful in developing the advanced logic program based on Eu(III) @ UMOFs for application in environmental monitoring.

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“…Such a strong and local ligand-analyte binding effectively concentrates the analyte within an extremely small volume of the gel for as high as 10 9 folds (i.e., concentrating an analyte droplet of 10 µL or 1 × 10 10 µm 3 into a 1.7 µm 3 volume). Compared to other high-performance sensors based on rigid porous carrier such as metal-organic framework, [13] the unique large volumetric shrinkage (≈10%) of the soft gel network further enhances the magnitude of this local concentrating effect. As a result of the ligand-analyte binding, the gel locally contracts or swells, depending on the ligand-to-analyte ratio, which leads to local thickness change.…”

Section: Hydrogelsmentioning

confidence: 99%

Hydrogel Interferometry for Ultrasensitive and Highly Selective Chemical Detection

et al. 2018

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Developing ultrasensitive chemical sensors with small scale and fast response through simple design and low‐cost fabrication is highly desired but still challenging. Herein, a simple and universal sensing platform based on a hydrogel interferometer with femtomol‐level sensitivity in detecting (bio)chemical molecules is demonstrated. A unique local concentrating effect (up to 109 folds) in the hydrogel induced by the strong analyte binding and large amount of ligands, combined with the signal amplification effect by optical interference, endows this platform with an ultrahigh sensitivity, specifically 10−14m for copper ions and 1.0 × 10−11 mg mL−1 for glycoprotein with 2–4 order‐of‐magnitude enhancement. The specific chemical reactions between selected ligands and target analytes provide high selectivity in detecting complex fluids. This universal principle with broad chemistry, simple physics, and modular design allows for high performance in detecting wide customer choices of analytes, including metal ions and proteins. The scale of the sensor can be down to micrometer size. The nature of the soft gel makes this platform transparent, flexible, stretchable, and compatible with a variety of substrates, showing high sensing stability and robustness after 200 cycles of bending or stretching. The outstanding sensing performance grants this platform great promise in broad practical applications.

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Pre-concentration and energy transfer enable the efficient luminescence sensing of transition metal ions by metal–organic frameworks

Cited by 58 publications

References 30 publications

Postsynthetic Modification of Zirconium Metal‐Organic Frameworks

Postsynthetic Modification of Zirconium Metal‐Organic Frameworks

Intelligent Molecular Searcher from Logic Computing Network Based on Eu(III) Functionalized UMOFs for Environmental Monitoring

Hydrogel Interferometry for Ultrasensitive and Highly Selective Chemical Detection

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