scholarly journals Sensing Properties of NH2-MIL-101 Series for Specific Amino Acids via Turn-On Fluorescence

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5336
Author(s):  
Jing Dong ◽  
Xiao-Yao Dao ◽  
Xiao-Yu Zhang ◽  
Xiu-Du Zhang ◽  
Wei-Yin Sun
Keyword(s):  
Amino Acids ◽  
Metal Organic Frameworks ◽  
Aqueous Media ◽  
Fluorescence Emission ◽  
Framework Structure ◽  
Metal Centers ◽  
Sensing Properties ◽  
Sensing Mechanism ◽  
Turn On ◽  
Metal Organic

Metal–organic frameworks (MOFs) have been demonstrated to be desired candidates for sensing definite species owing to their tunable composition, framework structure and functionality. In this work, the NH2-MIL-101 series was utilized for sensing specific amino acids. The results show that cysteine (Cys) can significantly enhance the fluorescence emission of NH2-MIL-101-Fe suspended in water, while NH2-MIL-101-Al exhibits the ability to sense lysine (Lys), arginine (Arg) and histidine (His) in aqueous media via turn-on fluorescence emission. Titration experiments ensure that NH2-MIL-101-Fe and NH2-MIL-101-Al can selectively and quantitatively detect these amino acids. The sensing mechanism was examined and discussed. The results of this study show that the metal centers in MOFs are crucial for sensing specific amino acids.

scholarly journals Synthesis, Structure and Fluorescence Properties of Two Metal-Organic Frameworks Based on a Benzimidazole-Derived Ligand

2018 ◽  
Vol 42 (8) ◽  
pp. 424-427 ◽  
Author(s):  
Junfeng Li ◽  
Xiudian Xu ◽  
Lei Zhou ◽  
Zeyu Zhou ◽  
Lizhuang Chen ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Porous Structure ◽  
Crystal Structures ◽  
Metal Organic Frameworks ◽  
Fluorescence Emission ◽  
Fluorescence Properties ◽  
Framework Structure ◽  
Hydrothermal Conditions ◽  
Metal Organic ◽  
3D Framework

The luminescent complexes [Cd(BIMP)2(NDC)2]n and [Zn(BIMP)2(NDC)]n (where (3-BIMP) = 3-(1H-benzoimidazol-2-yl)pyridin-2(1H)-one and NDC = 2,6-naphthalenedicarboxylic acid) have been synthesised under hydrothermal conditions and their crystal structures determined. [Cd(BIMP)2(NDC)2]n exhibited a 1D → 2D → 3D framework structure and [Zn(BIMP)2(NDC)]n has a 3D porous structure. Under the same excitation energy (λex = 389 nm), [Zn(BIMP)2(NDC)]n showed a stronger fluorescence emission than the free 3-BIMP ligand, the NDC ligand and [Cd(BIMP)2(NDC)2]n.

scholarly journals Amino group dependent sensing properties of metal–organic frameworks: selective turn-on fluorescence detection of lysine and arginine

RSC Advances ◽  
2020 ◽  
Vol 10 (61) ◽  
pp. 37449-37455
Author(s):  
Jing Dong ◽  
Xiu-Du Zhang ◽  
Xia-Fei Xie ◽  
Fan Guo ◽  
Wei-Yin Sun
Keyword(s):  
Fluorescence Detection ◽  
Metal Organic Frameworks ◽  
Amino Group ◽  
Sensing Properties ◽  
Turn On ◽  
Metal Organic ◽  
Fluorescence Turn On

The amino group of UiO-66-NH2 was demonstrated to play an important role in selective fluorescence turn-on sensing of lysine and arginine.

Tuning the Redox Activity of Metal−Organic Frameworks for Enhanced, Selective O2 Binding

2019 ◽  
Author(s):  
Andrew Rosen ◽  
M. Rasel Mian ◽  
Timur Islamoglu ◽  
Haoyuan Chen ◽  
Omar Farha ◽  
...  
Keyword(s):  
Density Functional ◽  
Metal Organic Frameworks ◽  
Redox Activity ◽  
Screening Methods ◽  
Bridging Ligands ◽  
Metal Centers ◽  
Computational Screening ◽  
Open Metal Sites ◽  
Metal Organic ◽  
Unsaturated Metal Sites

<p>Metal−organic frameworks (MOFs) with coordinatively unsaturated metal sites are appealing as adsorbent materials due to their tunable functionality and ability to selectively bind small molecules. Through the use of computational screening methods based on periodic density functional theory, we investigate O<sub>2</sub> and N<sub>2</sub> adsorption at the coordinatively unsaturated metal sites of several MOF families. A variety of design handles are identified that can be used to modify the redox activity of the metal centers, including changing the functionalization of the linkers (replacing oxido donors with sulfido donors), anion exchange of bridging ligands (considering μ-Br<sup>-</sup>, μ-Cl<sup>-</sup>, μ-F<sup>-</sup>, μ-SH<sup>-</sup>, or μ-OH<sup>-</sup> groups), and altering the formal oxidation state of the metal. As a result, we show that it is possible to tune the O<sub>2</sub> affinity at the open metal sites of MOFs for applications involving the strong and/or selective binding of O<sub>2</sub>. In contrast with O<sub>2</sub> adsorption, N<sub>2</sub> adsorption at open metal sites is predicted to be relatively weak across the MOF dataset, with the exception of MOFs containing synthetically elusive V<sup>2+</sup> open metal sites. As one example from the screening study, we predict that exchanging the μ-Cl<sup>-</sup> ligands of M<sub>2</sub>Cl<sub>2</sub>(BBTA) (H<sub>2</sub>BBTA = 1<i>H</i>,5<i>H</i>-benzo(1,2-d:4,5-d′)bistriazole) with μ-OH<sup>-</sup> groups would significantly enhance the strength of O<sub>2</sub> adsorption at the open metal sites without a corresponding increase in the N<sub>2</sub> affinity. Experimental investigation of Co<sub>2</sub>Cl<sub>2</sub>(BBTA) and Co<sub>2</sub>(OH)<sub>2</sub>(BBTA) confirms that the former exhibits only weak physisorption, whereas the latter is capable of chemisorbing O<sub>2</sub> at room temperature. The chemisorption behavior is attributed to the greater electron-donating character of the μ-OH<sup>-</sup><sub> </sub>ligands and the presence of H-bonding interactions between the μ-OH<sup>-</sup> bridging ligands and the O<sub>2</sub> adsorbate.</p>

N-Functionality Actuated Largely Improved CO2 Adsorption and Nanomolar Turn-on Detection of Organo-Toxins with Guest-Induced Fluorescence Modulation in Isostructural Diamondoid Frameworks

2021 ◽  
Author(s):  
Manpreet Singh ◽  
Athulya S. Palakkal ◽  
Renjith S. Pillai ◽  
Subhadip Neogi
Keyword(s):  
Carbon Dioxide ◽  
Functional Group ◽  
Co2 Adsorption ◽  
Metal Organic Frameworks ◽  
Turn On ◽  
Metal Organic ◽  
Fluorescence Modulation

Metal-organic frameworks (MOFs) have surfaced as incipient class of multifaceted materials for selective carbon dioxide (CO2) adsorption and luminescent detection of assorted classes of lethal organo-aromatics, where functional group assisted...

Metal-organic frameworks for electrochemical reduction of carbon dioxide: The role of metal centers

2020 ◽  
Vol 40 ◽  
pp. 156-170 ◽  
Author(s):  
Ping Shao ◽  
Luocai Yi ◽  
Shumei Chen ◽  
Tianhua Zhou ◽  
Jian Zhang
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
Metal Organic Frameworks ◽  
Metal Centers ◽  
Metal Organic

Synthesis and Characterization of Lanthanide Metal-Organic Frameworks with Perfluorinated Linkers

2016 ◽  
Vol 98 ◽  
pp. 70-74
Author(s):  
Andrius Laurikėnas ◽  
Jurgis Barkauskas ◽  
Aivaras Kareiva
Keyword(s):  
Metal Organic Frameworks ◽  
Aqueous Media ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Lanthanide Elements ◽  
Diffusion Controlled ◽  
Benzenedicarboxylic Acid ◽  
Metal Organic ◽  
Lanthanide Metal

In this study, lanthanide elements (Ln3+) and 2,3,5,6-tetrafluoro-1,4-benzenedicarboxylic acid (TFBDC) based metal-organic frameworks (MOFs) were synthesized by precipitation and diffusion-controlled precipitation methods. Powders insoluble in aqueous media and polar solvents were obtained. The microstructure and properties of Ln3+ MOFs were evaluated and discussed. X-ray diffraction (XRD) analysis, infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and fluorescence spectroscopy (FLS) were carried out to characterize Ln3+ MOF's crystallinity, the microstructure, chemical composition and optical properties.

Vapor-assisted self-conversion of basic carbonates in metal–organic frameworks

Nanoscale ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 5069-5076
Author(s):  
Miaomiao Jia ◽  
Jingyi Su ◽  
Pengcheng Su ◽  
Wanbin Li
Keyword(s):  
Carbon Capture ◽  
Metal Organic Frameworks ◽  
Solvent Vapor ◽  
Metal Centers ◽  
Metal Organic ◽  
High Alkalinity

Basic carbonates with high alkalinity are incorporated into metal–organic frameworks by solvent vapor-assisted self-conversion of partial metal centers to improve carbon capture performance.

Luminescent switch sensors for the detection of biomolecules based on metal–organic frameworks

The Analyst ◽  
2018 ◽  
Vol 143 (18) ◽  
pp. 4221-4229 ◽  
Author(s):  
Qi Zhang ◽  
Chen-Feng Wang ◽  
Yun-Kai Lv
Keyword(s):  
Metal Organic Frameworks ◽  
Turn On ◽  
Luminescent Sensors ◽  
Metal Organic ◽  
Detection Of Biomolecules

The applications of MOFs-based luminescent sensors for biomolecules sensing via a “turn on” or “turn off” response have been reviewed.

A turn-on fluorescence sensor for creatinine based on the quinoline-modified metal organic frameworks

Talanta ◽  
2020 ◽  
Vol 219 ◽  
pp. 121280 ◽  
Author(s):  
Shumei Qu ◽  
Qi Cao ◽  
Jiutong Ma ◽  
Qiong Jia
Keyword(s):  
Metal Organic Frameworks ◽  
Fluorescence Sensor ◽  
Turn On ◽  
Metal Organic
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