A distinct reversible colorimetric and fluorescent low pH response on a water-stable zirconium–porphyrin metal–organic framework

2014 ◽  
Vol 50 (68) ◽  
pp. 9636-9639 ◽  
Author(s):  
Benjamin J. Deibert ◽  
Jing Li
Keyword(s):  
Color Change ◽  
Metal Organic Framework ◽  
Low Ph ◽  
Ph Response ◽  
Metal Organic ◽  
Organic Framework

A conceptual drawing of PCN-222 showing the reversible color change from purple to green (and corresponding reversal) upon protonation (and subsequent deprotonation) from within the pores.

Selective chemochromic and chemically-induced photochromic response of a metal–organic framework

2020 ◽  
Vol 56 (44) ◽  
pp. 5929-5932 ◽  
Author(s):  
Peng Li ◽  
Qi Sui ◽  
Meng-Yue Guo ◽  
Shuai-Liang Yang ◽  
Ran Bu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electron Acceptor ◽  
Photoinduced Electron Transfer ◽  
Color Change ◽  
Metal Organic Framework ◽  
Confined Space ◽  
Chemically Induced ◽  
Metal Organic ◽  
Organic Framework

The MOF provides unique confined space furnished with electron acceptor sites, and exposure to amines/alcohols causes specific and size-selective direct/UV-assisted color change owing to spontaneous/photoinduced electron transfer.

A dye encapsulated terbium-based metal–organic framework for ratiometric temperature sensing

2016 ◽  
Vol 45 (46) ◽  
pp. 18689-18695 ◽  
Author(s):  
Tifeng Xia ◽  
Tao Song ◽  
Yuanjing Cui ◽  
Yu Yang ◽  
Guodong Qian
Keyword(s):  
Color Change ◽  
Metal Organic Framework ◽  
High Sensitivity ◽  
Temperature Sensing ◽  
Metal Organic ◽  
Organic Framework

A ratiometric and colorimetric thermometer with high sensitivity and significant color change from 50 to 300 K has been developed by encapsulating the luminescent dye 7-diethylamino-4-methylcoumarin (C460) into the channels of a terbium-based MOFTbTATAB.

A biocompatible Zr-based metal-organic framework UiO-66-PDC as an oral drug carrier for pH-response release

2021 ◽  
Vol 293 ◽  
pp. 121805
Author(s):  
Yan Wang ◽  
Wenxin Lin ◽  
Shijiang Yu ◽  
Xiajuan Huang ◽  
Xiurui Lang ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Drug Carrier ◽  
Oral Drug ◽  
Ph Response ◽  
Metal Organic ◽  
Organic Framework

pH Response of a Hydroxyl-Functionalized Luminescent Metal-Organic Framework based Phosphor

2021 ◽  
Author(s):  
Partha Mahata ◽  
Sayani Hui ◽  
Sudip Kumar Mondal ◽  
Prakash Majee ◽  
Debal Kanti Singha ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Phosphor Material ◽  
Hydrothermal Technique ◽  
Ph Response ◽  
Chelidamic Acid ◽  
Metal Organic ◽  
Organic Framework

A terbium doped yttrium based metal-organic framework [Y1.8Tb0.2(CAM)3(H2O)4].2H2O, 1{where H2CAM = chelidamic acid}, has been successfully synthesized using hydrothermal technique to use it as phosphor material along with large Stokes...

scholarly journals A Dual-Emitting Two-Dimensional Nickel-Based Metal-Organic Framework Nanosheets: Eu3+/Ag+ Functionalization Synthesis and Ratiometric Sensing in Aqueous Solution

2021 ◽  
Author(s):  
Yun Shu ◽  
Tao Dai ◽  
Qiuyu Ye ◽  
Dangqin Jin ◽  
Qin Xu ◽  
...  
Keyword(s):  
Color Change ◽  
Fluorescent Sensor ◽  
Metal Organic Framework ◽  
Organic Ligand ◽  
Disease Diagnosis ◽  
Ph Effects ◽  
Two Dimensional ◽  
Dual Emission ◽  
Metal Organic ◽  
Organic Framework

Abstract Using two-dimensional (2D) nickel-based metal organic framework (Ni-MOF) nanosheets as a matrix, Eu3+ and Ag+ were incorporated to synthesize Ag/Eu@Ni-MOF with double luminescence centers of Eu3+ ion (615 nm) and organic ligand (524 nm). And a ratiometric luminescence sensor is constructed based on Ag/Eu@Ni-MOF for sensitive detection of biothiols in aqueous solutions. The dual-emissive fluorescence properties can be tuned by changing the amounts of Ag+ ions doping. The results of temperature and pH effects on the fluorescence of Ag/Eu@Ni-MOF indicates that the Ag/Eu@Ni-MOF is a temperature-sensitive material and the fluorescence of Ag/Eu@Ni-MOF can keep stable over a wide pH range. Due to the binding of -SH in Cys and GSH with Ag+, the ligand luminescence was significantly inhibited by weakening the Ag+ influence on the energy transfer process in the MOFs. Therefore, ratiometric fluorescent sensing of biomolecular thiols was realized based on the dual-emission Ag/Eu@Ni-MOF. More importantly, the fluorescence color change can be observed with naked eyes to realize visual detection. The ratiometric fluorescent sensor exhibits high performance for Cys and GSH detection with a wide linear range of 5-250 μM and a relatively low detection limit of 0.20 μM and 0.17 μM, respectively. Furthermore, the biothiols content in human serum was determined with satisfactory results. It proves the Ni-MOF nanosheets can be used as a stable matrix for construction luminescent MOFs for the first time, and validate the great potential of Ag/Eu@Ni-MOF as a ratiometric fluorescent probe for point-of-care testing (POCT) in disease diagnosis.

Multifunctional metal–organic framework heterostructures for enhanced cancer therapy

2021 ◽  
Author(s):  
Jintong Liu ◽  
Jing Huang ◽  
Lei Zhang ◽  
Jianping Lei
Keyword(s):  
Cancer Therapy ◽  
General Principle ◽  
Biomedical Applications ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Functional Modulation ◽  
Organic Framework

We review the general principle of the design and functional modulation of nanoscaled MOF heterostructures, and biomedical applications in enhanced therapy.

Magnetic Ordering via Itinerant Ferromagnetism in a Metal-Organic Framework

2020 ◽  
Author(s):  
Jesse Park ◽  
Brianna Collins ◽  
Lucy Darago ◽  
Tomce Runcevski ◽  
Michael Aubrey ◽  
...  
Keyword(s):  
Charge Transport ◽  
Magnetic Order ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Double Exchange ◽  
Itinerant Ferromagnetism ◽  
Organic Solids ◽  
Metal Organic ◽  
Organic Framework

<b>Materials that combine magnetic order with other desirable physical attributes offer to revolutionize our energy landscape. Indeed, such materials could find transformative applications in spintronics, quantum sensing, low-density magnets, and gas separations. As a result, efforts to design multifunctional magnetic materials have recently moved beyond traditional solid-state materials to metal–organic solids. Among these, metal–organic frameworks in particular bear structures that offer intrinsic porosity, vast chemical and structural programmability, and tunability of electronic properties. Nevertheless, magnetic order within metal–organic frameworks has generally been limited to low temperatures, owing largely to challenges in creating strong magnetic exchange in extended metal–organic solids. Here, we employ the phenomenon of itinerant ferromagnetism to realize magnetic ordering at <i>T</i><sub>C</sub> = 225 K in a mixed-valence chromium(II/III) triazolate compound, representing the highest ferromagnetic ordering temperature yet observed in a metal–organic framework. The itinerant ferromagnetism is shown to proceed via a double-exchange mechanism, the first such observation in any metal–organic material. Critically, this mechanism results in variable-temperature conductivity with barrierless charge transport below <i>T</i><sub>C</sub> and a large negative magnetoresistance of 23% at 5 K. These observations suggest applications for double-exchange-based coordination solids in the emergent fields of magnetoelectrics and spintronics. Taken together, the insights gleaned from these results are expected to provide a blueprint for the design and synthesis of porous materials with synergistic high-temperature magnetic and charge transport properties. </b>

Solvent-Free Powder Synthesis and MOF-CVD Thin Films of the Mesoporous Metal-Organic Framework MAF-6

2019 ◽  
Author(s):  
Timothée Stassin ◽  
Ivo Stassen ◽  
Joao Marreiros ◽  
Alexander John Cruz ◽  
Rhea Verbeke ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Metal Organic Framework ◽  
Chemical Vapor ◽  
Uptake Capacity ◽  
Powder Synthesis ◽  
Crystalline Films ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
First Time ◽  
Organic Framework

A simple solvent- and catalyst-free method is presented for the synthesis of the mesoporous metal-organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤ 100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, mesoporous crystalline films could be deposited for the first time entirely from the vapor phase. A combination of PALS and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diam. ~2 nm), in close agreement with powder data and calculations. MAF-6 powders and films were further characterized by XRD, TGA, SEM, FTIR, PDF and EXAFS. The exceptional uptake capacity of the mesoporous MAF-6 in comparison to the microporous ZIF-8 is demonstrated by vapor-phase loading of a molecule larger than the ZIF-8 windows.

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