Fig 4 - uploaded by David Földes
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Interpenetrating frameworks with spiranes. H atoms and DMF molecules in the voids are omitted for clarity. View down along crystallographic a axis.
Source publication
![Fig. 1. Stereoisomers of spiro[3.3]heptane-2,6-dicarboxylic acid linker...](profile/David-Foeldes-2/publication/358305494/figure/fig1/AS:1127432497184768@1645812262010/Stereoisomers-of-spiro33heptane-2-6-dicarboxylic-acid-linker-L_Q320.jpg)
Herein we report the first homochiral IRMOF structure with chiral carbocyclic spiro linkers, basic Zn-(R)-spiro[3.3]heptane-2,6-dicarboxylate, named WIG-5. First, (R)-spiro[3.3]heptane-2,6-dicarboxylic acid was prepared involving a HPLC separation on chiral stationary phase, then further transformed into homochiral WIG-5 by the solvothermal reactio...
Context in source publication
Context 1
... β= γ = 90 °) and P2 1 2 1 2 1 space group. The crystal structure of WIG-5 is built up of two interpenetrating macromolecules ( Fig. 4 .). The chiral MOF structure has Zn 4 O(CO 2 ) 6 (DMF) 2 secondary building units ( Fig. 5 ) at the vertices and ( R )-spiro [3.3]heptane-2,6-dicarboxylic acid linkers at the edges. ...
Citations
... The basic MOF characterization techniques include scanning electron microscopy (SEM) to measure crystal size and morphology which can be coupled with energy dispersive X-ray spectroscopy (SEM-EDS) to learn more about elemental composition and distribution; single crystal X-ray diffraction (XRD) to determine the geometry, shape, crystallographic structure and crystallinity of MOF; powder X-ray diffraction (PXRD) pattern to establish crystallinity and phase purity of the material in addition to nitrogen (N 2 ) adsorption/ desorption isotherms to confirm porosity and calculate an apparent surface area [117][118][119] . Further characterization techniques and protocols may include thermogravimetric analysis (TGA) to determine the thermal stability of a MOF and in some cases to estimate the pore volume; aqueous stability testing to determine the stability of a MOF in water and at varying pH; inductively coupled plasma optical emission spectroscopy (ICP-OES) which can be used to determine the purity of a sample as well as elemental ratios; nuclear magnetic resonance (NMR) spectroscopy which can be used to determine the bulk purity of a sample in addition to quantifying linker ratios in mixed linker MOFs; diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) which can be used to confirm the presence or absence of IR active functional groups in the framework 25,121,122 . Other characterization techniques include the field emission scanning electron microscopy with energy dispersive X-rays (FESEM-EDX) to analyze the surface morphology; Dynamic light scattering (DLS) particle size distribution and Fourier transform infrared spectroscopy (FTIR) for chemical composition 117,123 . ...
Metal-organic frameworks (MOFs) are an emerging class of porous inorganic-organic high profile hybrid compounds that have attracted much attention in recent times due to their stunning properties. MOFs exhibit a large specific surface area (10 400 m² g⁻¹), high porosity (90%), high loading efficiency, uniform structural nanoscale cavities, tunable pore sizes (from micropores to mesopores), easy functionalization and post-synthetic modification, thermal and water stability, biocompatibility and biodegradability which make them better-performing materials than graphene, graphene oxides, carbon nanotubes, gold nanoparticles, silver nanoparticles, and magnetic nanoparticles in some crucial applications. In this review, the up-to-date advances in the methods of synthesis, characterization, and areas of MOF application have been presented. The conditions, strengths, and weaknesses of the various methods of synthesis and characterization have been highlighted. The applications of MOFs in biosensing, drug delivery, adsorption, catalysis, and energy and fuel storage have been explored. A perspective is given on the future expectations in the synthesis, characterization and applications of MOFs. This review will serve as a compendium of references to aid further studies in MOFs.
Chirality, which is involved in the origin and evolution of life, is a very interesting natural property. Pure enantiomers play a crucial role in the safety and health of organisms. Racemate resolution is one of the effective methods to obtain pure enantiomers. Chiral metal-organic frameworks materials (CMOF) have shown great potential in racemic resolution. In this review, the synthetic strategies of chiral metal-organic frameworks are systematically analyzed and discussed based on the resolution mechanism of the racemate in CMOF. In addition, the practical applications of chiral metal-organic frameworks in racemic resolution are comprehensively summarized and classified according to common separation techniques. Last but not least, we address some other issues, including challenges and future prospects in this field. It is hoped that it will be helpful for the development of chiral metal-organic frameworks for racemate resolution.
Metal-organic frameworks (MOFs), a functional material with a large specific surface area and high porosity have attracted increasing attention for their great potential in various applications. As a relatively time-saving, cost-effective, high-efficient and results-predictable method, theoretical calculation has gradually become a trend to guide MOFs material design and development. In this review, the most recent advances in theoretical studies of MOFs were systemically summarized, introducing the development of calculation methods and models with their merits and drawbacks, and emphasizing the employment of theoretical calculations in practical applications of MOFs. First, we briefly introduced the development of MOFs’ database construction, including hypothetical and experimental databases. The calculation methods and models to predict structures and properties of MOFs were thoroughly reviewed in the next part, and the merits and possible limitations are also discussed in detail. Additionally, we summarized the various promising applications of theoretical calculations in catalysis (including electrocatalysis and photocatalysis), selective gas separation and energy storage (including batteries and supercapacitor). The existing challenges of theoretical calculation in MOFs were also pointed out in the outlook. This review will provide a helpful guideline for the rational structure and function design of MOFs, and contribute to the material optimizations in applications of catalysis and energy storage.
