scholarly journals Thin Films of Homochiral Metal–Organic Frameworks for Chiroptical Spectroscopy and Enantiomer Separation

Symmetry ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 686 ◽  
Author(s):  
Chun Li ◽  
Lars Heinke
Keyword(s):  
Thin Films ◽  
Enantiomer Separation ◽  
Metal Organic Frameworks ◽  
Chiral Molecules ◽  
The Status ◽  
Metal Organic ◽  
Promising Application ◽  
Nanoporous Solids ◽  
Chiroptical Spectroscopy

Chiral nanoporous solids are a fascinating class of materials, allowing efficient enantiomer separation. Here, we review the status, applications, and potential of thin films of homochiral metal–organic frameworks (MOFs). Combining the advantages of MOFs, whose well-defined, crystalline structures can be rationally tuned, with the benefits of thin films enables new opportunities for the characterization of the enantioselectivity, e.g., via chiroptical spectroscopy and straightforward molecular uptake quantifications. By incorporating photoresponsive molecules in the chiral MOF films, the enantioselectivity of the material can be dynamically remote-controlled. The most promising application of MOF films is their use as membranes, where the enantioselective separation of chiral molecules is demonstrated and parameters for further improvements are discussed.

scholarly journals On the Use of MOFs and ALD Layers as Nanomembranes for the Enhancement of Gas Sensors Selectivity

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1552 ◽  
Author(s):  
Weber ◽  
Graniel ◽  
Balme ◽  
Miele ◽  
Bechelany
Keyword(s):  
Thin Films ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Metal Organic Frameworks ◽  
Atomic Layer ◽  
Operational Performance ◽  
Layer Deposition ◽  
Metal Organic ◽  
Further Development ◽  
Different Gases

Improving the selectivity of gas sensors is crucial for their further development. One effective route to enhance this key property of sensors is the use of selective nanomembrane materials. This work aims to present how metal-organic frameworks (MOFs) and thin films prepared by atomic layer deposition (ALD) can be applied as nanomembranes to separate different gases, and hence improve the selectivity of gas sensing devices. First, the fundamentals of the mechanisms and configuration of gas sensors will be given. A selected list of studies will then be presented to illustrate how MOFs and ALD materials can be implemented as nanomembranes and how they can be implemented to improve the operational performance of gas sensing devices. This review comprehensively shows the benefits of these novel selective nanomaterials and opens prospects for the sensing community.

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.

scholarly journals A Comparison of Barostats for the Mechanical Characterization of Metal–Organic Frameworks

2015 ◽  
Vol 11 (12) ◽  
pp. 5583-5597 ◽  
Author(s):  
S.M.J. Rogge ◽  
L. Vanduyfhuys ◽  
A. Ghysels ◽  
M. Waroquier ◽  
T. Verstraelen ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Metal Organic Frameworks ◽  
Metal Organic

scholarly journals STUDY OF SYNTHESIS AND CHARACTERIZATION OF METAL-ORGANIC FRAMEWORKS MOF-5 AS HYDROGEN STORAGE MATERIAL

2016 ◽  
Vol 12 (1) ◽  
pp. 14
Author(s):  
Prapti Rahayu ◽  
Witri Wahyu Lestari
Keyword(s):  
Hydrogen Storage ◽  
Metal Organic Frameworks ◽  
Synthesis Method ◽  
High Porosity ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Good Thermal Stability ◽  
Metal Organic ◽  
Organic Linker

<p>Metal-organic frameworks (MOFs) are porous coordination polymer containing bi-or polidentate organic linker coordinated with inorganic part, such as metal oxide cluster or metal cation as node which called as secondary building unit (SBU) to form infinite structure. Due to high porosity and surface area, good thermal stability as well as the availability of unsaturated metal center or the linker influence attracts the interaction with gases, thus MOFs have potential to be applied as hydrogen storage material. One type of MOFs that have been widely studied is [Zn<sub>4</sub>O(benzene-1,4-dicarboxylate)<sub>3</sub>], namely, MOF-5.Various synthesis method have been developed to obtain optimum results. Characterization of MOF-5 from various synthesis method such as crystallinity, capacity, stability, and quantum dot behavior of MOF-5 have been summarized in this review.</p>

cis-to-trans isomerization of azobenzene investigated by using thin films of metal–organic frameworks

2015 ◽  
Vol 17 (35) ◽  
pp. 22721-22725 ◽  
Author(s):  
Xiaojuan Yu ◽  
Zhengbang Wang ◽  
Maria Buchholz ◽  
Nena Füllgrabe ◽  
Sylvain Grosjean ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Organic Frameworks ◽  
Model System ◽  
Trans Isomerization ◽  
System P ◽  
Metal Organic

The energetic barrier for the cis-to-trans isomerization of azobenzene was experimentally investigated by using thin films of azobenzene-containing MOFs as well-defined model system.

Porphyrins functionalized by quaternary pyridinium units

2013 ◽  
Vol 17 (12) ◽  
pp. 1139-1156 ◽  
Author(s):  
Beata Girek ◽  
Wanda Sliwa
Keyword(s):  
Metal Ions ◽  
Singlet Oxygen ◽  
Organic Materials ◽  
Metal Organic Frameworks ◽  
Free Base ◽  
Cationic Porphyrins ◽  
Manganese Porphyrins ◽  
Fourth Part ◽  
Metal Organic

In this review, free-base and metalloporphyrins, functionalized on meso-positions by quaternary pyridinium units, also referred to as cationic porphyrins, are presented. The article consists of five parts. In the first part free-base porphyrins are described, especially taking account on generation of singlet oxygen; next parts concern metalloporphyrins. The second and third parts deal with zinc and manganese porphyrins, respectively; in the fourth part copper, palladium, and platinum porphyrins are presented. In the fifth part, describing porphyrins with various metal ions an attention is paid to porphyrin metal-organic frameworks (MOFs) and metal-organic materials (MOMs) in which metalloporphyrins are immobilized; syntheses and characterization of obtained products are shown.

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