Journal articles: 'Metal Organic Framework (MOF) Compounds'

1

Figueroa-Quintero, Leidy, Enrique Vicente Ramos-Fernandez, and Javier Narciso. "Synthesis and Characterization of the Metal–Organic Framework CIM-80 for Organic Compounds Adsorption." Materials 15, no. 15 (August 2, 2022): 5326. http://dx.doi.org/10.3390/ma15155326.

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Metal–organic frameworks (MOF) are a new type of porous materials that have great potential for adsorption of voltaic organic compounds (VOCs). These types of materials composed of metal ions and organic ligands are easy to synthesize, have high surface areas, their surface chemistry can be adjusted to the desired application, and they can also have good chemical and thermal stability. Therefore, this work focuses on the synthesis of a highly hydrophobic MOF material called CIM-80, a porous material that is made up of the Al3+ cation and the mesaconate linker. This MOF has a B.E.T. of approximately 800 m2/g and has potential applications for the adsorption of hydrophobic organic compounds. However, its synthesis is expensive and very dirty. Therefore, we have studied the synthesis conditions necessary to achieve high synthesis yields (85%) and materials with high crystallinity and accessible porosity. To achieve these results, we have used urea as a mild deprotonation reagent and modulator as an alternative to NaOH, which is traditionally used for the synthesis of this MOF. Once the synthesis of this material was controlled, its adsorption/desorption behavior of water and organic compounds such as toluene, cyclohexane and m-xylene was studied by means of vapor adsorption isotherms. The results show the hydrophobic character of the material and the greater affinity the material has toward aliphatic compounds than toward aromatic ones, with toluene being the most adsorbed compound, followed by cyclohexane and m-xylene.

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Iswarya, N., M. Ganesh Kumar, K. S. Rajan, and John Bosco Balaguru Rayappan. "Metal Organic Framework (MOF-5) For Sensing of Volatile Organic Compounds." Journal of Applied Sciences 12, no. 16 (August 1, 2012): 1681–85. http://dx.doi.org/10.3923/jas.2012.1681.1685.

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Figueira, Flávio, Ricardo F. Mendes, Eddy M. Domingues, Paula Barbosa, Filipe Figueiredo, Filipe A. A. Paz, and João Rocha. "Easy Processing of Metal–Organic Frameworks into Pellets and Membranes." Applied Sciences 10, no. 3 (January 22, 2020): 798. http://dx.doi.org/10.3390/app10030798.

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Herein, we present a simple and inexpensive method for the immobilization of Metal–Organic Framework (MOF) particles in the form of pellets and membranes. This processing procedure is possible using polymethacrylate polymer (PMMA) as a binding or coating agent, improving stability and significantly increasing the water repellency. HKUST and MMOF-74 (M = Mg2+, Zn2+, Co2+ or Ni2+) are stable with the processing and high loadings of MOF materials into the processed pellet or membranes. These methods can provide the know-how for the immobilization of MOFs for, for example, application in air purification and the removal of toxic compounds and are well-suited for deployment in air purification devices.

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Loiseau, Thierry, and Gérard Férey. "Crystalline oxyfluorinated open-framework compounds: Silicates, metal phosphates, metal fluorides and metal-organic frameworks (MOF)." Journal of Fluorine Chemistry 128, no. 4 (April 2007): 413–22. http://dx.doi.org/10.1016/j.jfluchem.2006.09.009.

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Wei, Xiao-Qin, Dong Shao, Cai-Long Xue, Xing-Yu Qu, Jie Chai, Jian-Qing Li, Yi-En Du, and Yong-Qiang Chen. "Field-induced slow magnetic relaxation in two interpenetrated cobalt(ii) metal–organic framework isomers." CrystEngComm 22, no. 32 (2020): 5275–79. http://dx.doi.org/10.1039/d0ce00979b.

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Two interpenetrated cobalt(ii) metal–organic framework (MOF) isomers were successfully synthesized and magnetically characterized. These compounds are the first example of MOF isomers showing field-induced single-ion magnet behavior.

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Yi, Fei-Yan, Ying Wang, Jian-Ping Li, Dai Wu, Ya-Qian Lan, and Zhong-Ming Sun. "An ultrastable porous metal–organic framework luminescent switch towards aromatic compounds." Materials Horizons 2, no. 2 (2015): 245–51. http://dx.doi.org/10.1039/c4mh00210e.

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Ibrahim, Balsam, Bryan E. G. Lucier, Jun Xu, Peng He, and Yining Huang. "Investigating adsorption of organic compounds in metal-organic framework MIL-53." Canadian Journal of Chemistry 93, no. 9 (September 2015): 960–69. http://dx.doi.org/10.1139/cjc-2014-0598.

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Metal-organic frameworks (MOFs) are versatile materials that incorporate metal centers along with organic linkers in highly ordered, intricate structures. MIL-53 is a MOF that exhibits a “breathing effect,” where the pore size and MOF topology are profoundly influenced by the identity and binding mechanism of guest molecules. This phenomenon renders MIL-53 a promising candidate for sensing applications. In this report, the adsorption of various organic compounds within MIL-53 is investigated using a combination of complementary techniques. Thermal gravimetric analysis experiments confirm loading of the guest molecules and yield insight into adsorption interactions and strengths. Significant guest-induced changes in the crystal structure of MIL-53 are revealed by powder X-ray diffraction experiments; specific unique phases of MIL-53 are related to the identity of the guest molecule and its binding mechanism to the framework. 27Al and 13C solid-state NMR experiments probe the interaction between guest molecules and MIL-53. The relationship between the nature of the guest, the structure of MIL-53, and 27Al NMR parameters is explored. 27Al NMR parameters are sensitive to the host-guest binding mechanism (i.e., hydrogen-bonding or π–π stacking interactions) and yield valuable information regarding the influence of the adsorbates on the local aluminum environment. This combination of physical characterization techniques is a useful probe of guest adsorption and the breathing effect within MIL-53 and should prove useful for investigation of related MOFs.

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Li, Huijun, Yaling He, Qingqing Li, Shaojie Li, Zhihao Yi, Zhouqing Xu, and Yuan Wang. "Highly sensitive and selective fluorescent probe for Fe3+ and hazardous phenol compounds based on a water-stable Zn-based metal–organic framework in aqueous media." RSC Adv. 7, no. 79 (2017): 50035–39. http://dx.doi.org/10.1039/c7ra08427g.

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Li, Hai-Yang, Shu-Na Zhao, Shuang-Quan Zang, and Jing Li. "Functional metal–organic frameworks as effective sensors of gases and volatile compounds." Chemical Society Reviews 49, no. 17 (2020): 6364–401. http://dx.doi.org/10.1039/c9cs00778d.

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Raza, Mohsin, Muhammad Javaid, and Naeem Saleem. "Fractional metric dimension of metal-organic frameworks." Main Group Metal Chemistry 44, no. 1 (January 1, 2021): 92–102. http://dx.doi.org/10.1515/mgmc-2021-0012.

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Abstract Metal-organic frameworks (MOF(n)) are organic-inorganic hybrid crystalline porous materials that consist of a regular array of positively charged metal ions surrounded by organic ‘linker’ molecules. The metal ions form nodes that bind the arms of the linkers together to form a repeating, cage-like structure. Moreover, in a chemical structure or molecular graph, edges and vertices are known as bonds and atoms, respectively. Metric dimension being a subsets of atoms with minimum cardinality is used in the substrcturing of the chemical compounds in the molecular structures. Fractional metric dimension is weighted version of metric dimension that associate a numeric value to the identified subset of atoms. In this paper, we have computed the fractional metric dimension of metal organic framework (MOF(n)) for n ≡ 0(mod)2.

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Xie, Yangyang, Sining Lyu, Yue Zhang, and Changhong Cai. "Adsorption and Degradation of Volatile Organic Compounds by Metal–Organic Frameworks (MOFs): A Review." Materials 15, no. 21 (November 2, 2022): 7727. http://dx.doi.org/10.3390/ma15217727.

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Volatile organic compounds (VOCs) are a major threat to human life and health. The technologies currently used to remove VOCs mainly include adsorption and photocatalysis. Adsorption is the most straightforward strategy, but it cannot ultimately eliminate VOCs. Due to the limited binding surface, the formaldehyde adsorption on conventional photocatalysts is limited, and the photocatalytic degradation efficiency is not high enough. By developing novel metal–organic framework (MOF) materials that can catalytically degrade VOCs at room temperature, the organic combination of new MOF materials and traditional purification equipment can be achieved to optimize adsorption and degradation performance. In the present review, based on the research on the adsorption and removal of VOCs by MOF materials in the past 10 years, starting from the structure and characteristics of MOFs, the classification of which was described in detail, the influencing factors and mechanisms in the process of adsorption and removal of VOCs were summarized. In addition, the research progress of MOF materials was summarized, and its future development in this field was prospected.

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He, Hongming, Si-Hang Chen, De-Yu Zhang, En-Cui Yang, and Xiao-Jun Zhao. "A luminescent metal–organic framework as an ideal chemosensor for nitroaromatic compounds." RSC Advances 7, no. 62 (2017): 38871–76. http://dx.doi.org/10.1039/c7ra06320b.

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David, Jérémy, Gilles Trolliard, Christophe Volkringer, Thierry Loiseau, and Alexandre Maître. "Synthesis of zirconium oxycarbide powders using metal–organic framework (MOF) compounds as precursors." RSC Advances 5, no. 64 (2015): 51650–61. http://dx.doi.org/10.1039/c5ra01172h.

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Wu, Fuhai, Buke Wu, Yongbiao Mu, Binbin Zhou, Guobin Zhang, and Lin Zeng. "Metal-Organic Framework-Based Materials in Aqueous Zinc-Ion Batteries." International Journal of Molecular Sciences 24, no. 7 (March 23, 2023): 6041. http://dx.doi.org/10.3390/ijms24076041.

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Aqueous zinc-ion batteries (AZIBs) are promising for large-scale energy storage systems due to their high safety, large capacity, cost-effectiveness, and environmental friendliness. However, their commercialization is currently hindered by several challenging issues, including cathode degradation and zinc dendrite growth. Recently, metal-organic frameworks (MOFs) and their derivatives have gained significant attention and are widely used in AZIBs due to their highly porous structures, large specific surface area, and ability to design frameworks for Zn2+ shuttle. Based on preceding contributions, this review aims to generalize two design principles for MOF-based materials in AZIBs: cathode preparation and anode protection. For cathode preparation, we mainly introduce novel MOF-based electrode materials such as pure MOFs, porous carbon materials, metal oxides, and their compounds, focusing on the analysis of the specific capacity of AZIBs. For anode protection, we systematically analyze MOF-based materials used as 3D Zn architecture, solid electrolyte interfaces, novel separators, and solid-state electrolytes, highlighting the improvement in the cyclic stability of Zn anodes. Finally, we propose the future development of MOF-based materials in AZIBs. Our work can give some clues for raising the practical application level of aqueous ZIBs.

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Jalali, Mehrdad, Manuel Tsotsalas, and Christof Wöll. "MOFSocialNet: Exploiting Metal-Organic Framework Relationships via Social Network Analysis." Nanomaterials 12, no. 4 (February 20, 2022): 704. http://dx.doi.org/10.3390/nano12040704.

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The number of metal-organic frameworks (MOF) as well as the number of applications of this material are growing rapidly. With the number of characterized compounds exceeding 100,000, manual sorting becomes impossible. At the same time, the increasing computer power and established use of automated machine learning approaches makes data science tools available, that provide an overview of the MOF chemical space and support the selection of suitable MOFs for a desired application. Among the different data science tools, graph theory approaches, where data generated from numerous real-world applications is represented as a graph (network) of interconnected objects, has been widely used in a variety of scientific fields such as social sciences, health informatics, biological sciences, agricultural sciences and economics. We describe the application of a particular graph theory approach known as social network analysis to MOF materials and highlight the importance of community (group) detection and graph node centrality. In this first application of the social network analysis approach to MOF chemical space, we created MOFSocialNet. This social network is based on the geometrical descriptors of MOFs available in the CoRE-MOFs database. MOFSocialNet can discover communities with similar MOFs structures and identify the most representative MOFs within a given community. In addition, analysis of MOFSocialNet using social network analysis methods can predict MOF properties more accurately than conventional ML tools. The latter advantage is demonstrated for the prediction of gas storage properties, the most important property of these porous reticular networks.

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Mbonu, Idongesit Justina, and Charles Chisom Mbonu. "Cobalt(II) Metal-organic Framework as Scintillating Material." Journal of the Indonesian Chemical Society 3, no. 2 (August 31, 2020): 87. http://dx.doi.org/10.34311/jics.2020.03.2.87.

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Novel cobalt(II) metal-organic framework was grown by the reaction of a methanol solution of 8-hydroxyquinoline and benzoic acid with aqueous solution of cobalt(II) chloride hexahydrate using slow solvent evaporation. The X-ray luminescence of the synthesized compound showed vibronic peaks: one with λmax at 489 nm and shoulders at 424 and 531 nm, respectively, which compare favorably with best organic scintillators such as anthracene –447 nm and stilbene –410 nm currently in application. The elemental analysis of the metal complex suggests a metal to ligands ratio of 1:1:1. Conductance measurement shows a nonelectrolytic nature of the synthesized compound. The SEM studies give the surface morphology of the complex. The observed emission bands with different dynamics in response to temperature change suggest that the Co-MOF exhibits scintillation properties. Electronic spectrum and magnetic moment studies were used to determine the geometry of the Co-MOF molecule. Thermal analysis data reported displayed the extent of stability of the Co-MOF compound. PXRD data revealed the nanocrystalline nature of the complex. Energy resolution peak observed at 2535 KeV, suggest the synthesized compound can be used as a scintillator.

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Brown, Craig, and Winnie Wong-Ng. "Special section: crystallography and properties of metal organic framework (MOF) compounds." Powder Diffraction 34, no. 1 (March 2019): 2. http://dx.doi.org/10.1017/s0885715619000034.

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Brown, Craig M., and Winnie Wong-Ng. "Special section – Crystallography and properties of metal–organic framework (MOF) compounds." Powder Diffraction 35, no. 1 (March 2020): 2. http://dx.doi.org/10.1017/s0885715620000093.

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19

Neti, Venkata. "MOF-177/graphene composite as a selective sensor for nitro aromatic compounds." MRS Proceedings 1794 (2015): 1–7. http://dx.doi.org/10.1557/opl.2015.555.

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ABSTRACTA zinc-based metal-organic framework, MOF-177, was synthesized on the surface of benzoic acid functionalized reduced graphene oxide (BFG). Large amount of BFG (30wt %) slightly improved the stability of the MOF on the graphene surface, decreased the porosity of the composite, and resulted in 1mm long and 50µm wide microrods of MOF-177/BFG composites which act as a selective sensor for trinitrophenol compared to trinitrotoluene.

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Xu, Ning, Qinghua Zhang, and Guoan Zhang. "A carbazole-functionalized metal–organic framework for efficient detection of antibiotics, pesticides and nitroaromatic compounds." Dalton Transactions 48, no. 8 (2019): 2683–91. http://dx.doi.org/10.1039/c8dt04558e.

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Qin, Haojia, Shuai Zhao, Huaping Gong, Zhi Yu, Qiang Chen, Pei Liang, and De Zhang. "Recent Progress in the Application of Metal Organic Frameworks in Surface-Enhanced Raman Scattering Detection." Biosensors 13, no. 4 (April 16, 2023): 479. http://dx.doi.org/10.3390/bios13040479.

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Metal–organic framework (MOF) compounds are centered on metal ions or metal ion clusters, forming lattices with a highly ordered periodic porous network structure by connecting organic ligands. As MOFs have the advantages of high porosity, large specific surface area, controllable pore size, etc., they are widely used in gas storage, catalysis, adsorption, separation and other fields. SERS substrate based on MOFs can not only improve the sensitivity of SERS analysis but also solve the problem of easy aggregation of substrate nanoparticles. By combining MOFs with SERS, SERS performance is further improved, and tremendous research progress has been made in recent years. In this review, three methods of preparing MOF-based SERS substrates are introduced, and the latest applications of MOF-based SERS substrates in biosensors, the environment, gases and medical treatments are discussed. Finally, the current status and prospects of MOF-based SERS analysis are summarized.

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Liu, Xiaofang, Zhigang Liu, and Rui Wang. "Functionalized Metal-Organic Framework Catalysts for Sustainable Biomass Valorization." Advances in Polymer Technology 2020 (February 27, 2020): 1–11. http://dx.doi.org/10.1155/2020/1201923.

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Currently, pristine and functionalized metal-organic frameworks (MOFs) are introduced in heterogeneous catalysis for biomass upgrading owing to the specific texture properties including regular higher-order structure, high specific surface area, and the precisely tailored diversity. The purpose of this review is to afford a comprehensive discussion of the most applications in biomass refinery. We highlight recently developed four types of MOFs like pristine MOFs and their composites, MOF-supported metal NPs, acid-functionalized MOFs, and biofunctionalized MOFs for production of green, sustainable, and industrially acceptable biomass-derived platform molecules: (1) upgrading of saccharides, (2) upgrading of furan derivatives, and (3) upgrading of other biobased compounds.

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Yang, Kun, Feng Xue, Qian Sun, Renliang Yue, and Daohui Lin. "Adsorption of volatile organic compounds by metal-organic frameworks MOF-177." Journal of Environmental Chemical Engineering 1, no. 4 (December 2013): 713–18. http://dx.doi.org/10.1016/j.jece.2013.07.005.

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Zhao, Junjie. "(Invited, Digital Presentation) Atomic Layer Deposited Templates for Constructing Functional Metal-Organic Framework Thin Films." ECS Meeting Abstracts MA2022-02, no. 31 (October 9, 2022): 1145. http://dx.doi.org/10.1149/ma2022-02311145mtgabs.

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Metal-organic frameworks (MOFs) are a class of porous crystalline materials featuring high surface area, ordered pore structures and amenability for post-synthetic modification. Integrating MOF thin films with various substrate materials could enable applications in separations, heterogeneous catalysis, chemical sensors and electronic devices. However, it is difficult to find a universal approach to deposit uniform and high-quality MOF coatings on a variety of substrate materials. Previous attempts often require surface modification methods that may not be generally applicable. In this talk, interfacial engineering using atomic layer deposited (ALD) templates will be discussed for forming MOF thin films on various substrates. We found that ALD metal oxides are effective in promoting the heterogeneous nucleation of MOFs and also readily hydrolyzed into hydroxy double salts (HDSs) for rapid transformation to MOFs. With ALD template layers, conformal and functional MOF coatings were integrated on fibers, membranes and laminated structures. Accordingly, we developed a series of MOF-functionalized fibers for adsorption and catalytic degradation of hazardous compounds. Furthermore, we obtained ultra-thin mixed-metal MOF skin layers on porous alumina supports for membrane separation, and achieved large propylene permeance (up to 4.5×10-8 mol·m-2·s-1·Pa-1) and high propylene/propane selectivity over 250. We anticipate that this platform technology will also lead to potential device structures for chemical sensing, energy storage and many other scenarios.

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Ma, Peihua, Zhi Zhang, Shawn Tsai, Hongchao Zhang, Yuan Li, Fang Yuan, and Qin Wang. "Curcumin-Loaded Pickering Emulsion Formed by Ultrasound and Stabilized by Metal Organic Framework Optimization." Foods 10, no. 3 (March 3, 2021): 523. http://dx.doi.org/10.3390/foods10030523.

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The ultrasound-assisted preparation of a curcumin-loaded metal organic framework (MOF) UiO-66-NH2 stabilized Pickering emulsion system was carried out in this study. A 3-level-4-factor Box–Behnken design (BBD) and response surface methodology (RSM) analysis were employed to systematically evaluate the effect of different experimental parameters (i.e., ultrasonic power, ultrasonic time, oil content, and MOF content) on curcumin loading capacity (LC) and encapsulation efficiency (EE). The results indicated that ultrasonic power and MOF content significantly affected LC and EE, whereas ultrasonic time and oil content had little effect. A mathematical model for optimizing the preparation of emulsion systems was established. Based on the ridge max analysis, an optimal condition for the newly developed curcumin-loaded MOF-Pickering emulsion was identified, i.e., ultrasonic power 150 W, ultrasonic time 11.17 min, oil content 20.0%, and MOF content 1.10%. At this condition, the LC and EE of curcumin obtained from the experiment reached 7.33% ± 0.54% and 56.18% ± 3.03%, respectively, which were within the prediction range of LC (7.35% ± 0.29%) and EE (54.34% ± 2.45%). The emulsion systems created in this study may find new applications for the delivery of bioactive compounds in food and pharmaceutical areas.

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Cao, Xin, Haijian Li, Jianhua Yi, Fengqi Zhao, and Yucheng Hao. "Recent advances for water-stable metal-organic frameworks (MOFs)." Journal of Physics: Conference Series 2478, no. 6 (June 1, 2023): 062029. http://dx.doi.org/10.1088/1742-6596/2478/6/062029.

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Abstract Metal-organic framework (MOF) compounds have been widely studied and explored for many years due to their diversity of structure and composition. It is a new kind of framework material because of its high specific surface area, high porosity, and adjustable pore structure and internal environment. It has unlimited development prospects in gas storage, separation, catalysis, chemical sensing, and other related fields. Therefore, MOFs have attracted great and extensive attention. This paper mainly summarizes MOFs materials with good water stability, and stability of MOFs compounds under various harsh environmental conditions was analyzed, and the synthetic method and properties of these MOFs materials were summarized. In conclusion, this paper for the summary of the water-resistant MOFs compounds is helpful to provide a good guide to finding or creating other novel water stability MOFs functional materials.

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Afkhami-Ardekani, Mahya, Mohammad Reza Naimi-Jamal, Samira Doaee, and Sadegh Rostamnia. "Solvent-Free Mechanochemical Preparation of Metal-Organic Framework ZIF-67 Impregnated by Pt Nanoparticles for Water Purification." Catalysts 13, no. 1 (December 22, 2022): 9. http://dx.doi.org/10.3390/catal13010009.

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In this study, the crystalline metal-organic framework (MOF) ZIF-67 was obtained using the solvent-free ball milling method, which is a fast, simple, and economical green method without the need to use solvents. Using the impregnation method, platinum metal ions were loaded in the MOF cavities. Various descriptive methods have been used to explain the prepared Pt@ZIF-67 compound, such as FTIR, BET, TEM, SEM, EDS, XRD, TGA, and ICP. Based on this, the results showed that Pt nanoparticles (0.26 atom%) were located inside the pores of ZIF-67. In addition, no evidence supports their accumulation on the MOF surface. The efficiency of Pt@ZIF-67 was approved in the reduction of toxic and harmful nitrophenol compounds in water. The results showed that the removal of 4-nitrophenol in aqueous medium was successfully achieved with 94.5% conversion in an optimal time of 5 min with the use of NaBH4, and catalyzed by Pt@ZIF-67. Additionally, the Pt@ZIF-67 was recoverable and successfully tested for five qtr runs, with reasonable efficiency.

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Øien-Ødegaard, Sigurd, and Karl Lillerud. "Twinning in Zr-Based Metal-Organic Framework Crystals." Chemistry 2, no. 3 (September 16, 2020): 777–86. http://dx.doi.org/10.3390/chemistry2030050.

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Ab initio structure determination of new metal-organic framework (MOF) compounds is generally done by single crystal X-ray diffraction, but this technique can yield incorrect crystal structures if crystal twinning is overlooked. Herein, the crystal structures of three Zirconium-based MOFs, that are especially prone to twinning, have been determined from twinned crystals. These twin laws (and others) could potentially occur in many MOFs or related network structures, and the methods and tools described herein to detect and treat twinning could be useful to resolve the structures of affected crystals. Our results highlight the prevalence (and sometimes inevitability) of twinning in certain Zr-MOFs. Of special importance are the works of Howard Flack which, in addition to fundamental advances in crystallography, provide accessible tools for inexperienced crystallographers to take twinning into account in structure elucidation.

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Xing, Xiu-Shuang, Zi-Wei Chen, Li-Zhen Cai, Cai Sun, Lin-Rong Cai, Ming-Sheng Wang, and Guo-Cong Guo. "An electron-transfer photochromic metal–organic framework (MOF) compound with a long-lived charge-separated state and high-contrast photoswitchable luminescence." RSC Advances 6, no. 29 (2016): 24190–94. http://dx.doi.org/10.1039/c5ra25707g.

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A new photochromic MOF compound exhibits a charge-separated state with lifetime exceeding the reported values of the analogues and a luminescence contrast higher than those of most known pyridine derivative-based photochromic compounds.

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Harvey, Jacob A., Charles J. Pearce, Morgan G. Hall, Eric J. Bruni, Jared B. DeCoste, and Dorina F. Sava Gallis. "Insights into the solvent-assisted degradation of organophosphorus compounds by a Zr-based metal–organic framework." Dalton Transactions 48, no. 43 (2019): 16153–57. http://dx.doi.org/10.1039/c9dt03710a.

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Zhu, Yu, Yan-Mei Wang, Pan Liu, Yun-Long Wu, Wei Wei, Chang-Kun Xia, and Ji-Min Xie. "Cage-like pores of a metal–organic framework for separations and encapsulation of Pd nanoparticles for efficient catalysis." New Journal of Chemistry 39, no. 4 (2015): 2669–74. http://dx.doi.org/10.1039/c4nj01985g.

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Wei, Huijie, Huiyan Zhang, Bing Song, Kaiping Yuan, Hongbin Xiao, Yunyi Cao, and Qi Cao. "Metal–Organic Framework (MOF) Derivatives as Promising Chemiresistive Gas Sensing Materials: A Review." International Journal of Environmental Research and Public Health 20, no. 5 (March 1, 2023): 4388. http://dx.doi.org/10.3390/ijerph20054388.

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The emission of harmful gases has seriously exceeded relative standards with the rapid development of modern industry, which has shown various negative impacts on human health and the natural environment. Recently, metal–organic frameworks (MOFs)-based materials have been widely used as chemiresistive gas sensing materials for the sensitive detection and monitoring of harmful gases such as NOx, H2S, and many volatile organic compounds (VOCs). In particular, the derivatives of MOFs, which are usually semiconducting metal oxides and oxide–carbon composites, hold great potential to prompt the surface reactions with analytes and thus output amplified resistance changing signals of the chemiresistors, due to their high specific surface areas, versatile structural tunability, diversified surface architectures, as well as their superior selectivity. In this review, we introduce the recent progress in applying sophisticated MOFs-derived materials for chemiresistive gas sensors, with specific emphasis placed on the synthesis and structural regulation of the MOF derivatives, and the promoted surface reaction mechanisms between MOF derivatives and gas analytes. Furthermore, the practical application of MOF derivatives for chemiresistive sensing of NO2, H2S, and typical VOCs (e.g., acetone and ethanol) has been discussed in detail.

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Wang, Guanyu, Qiaoge Fu, Ruili Guo, and Zhong Wei. "Selective adsorption and separation of stevioside and rebaudioside A by a metal-organic framework with boronic acid." Canadian Journal of Chemistry 98, no. 11 (November 2020): 708–16. http://dx.doi.org/10.1139/cjc-2020-0175.

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The boronic acid functionalization metal-organic frameworks (MOFs), as unique boronate affinity adsorbents, have desired specific molecular affinity for the separation and enrichment of cis-diol-compounds. Herein, the boronic acid functionalized Zn-based MOF adsorbent (MOF-BA) was synthesized through a simple one-step microwave method and used for the recognition and isolation of steviol glycosides (SGs). This MOF-BA exhibits the same spherical structure and isostructure with the parent framework composed only of the primitive ligand as verified by SEM and XRD characterization. It was confirmed that changing the ratio of ligands could achieve the adjustability of the boron content in the framework. At the same time, the MOF-BA-1.0 showed a suitable pore size (4.69 nm), and the presence of boric acid functional groups showed favorable selectivity for stevioside (STV). The static adsorption results showed that adsorption performances of rebaudioside A (RA) and STV from crude sugar solution (5.0 mg mL−1, pH 8) on MOF-BA-1.0 were investigated at 303 K for 15 h. The adsorption capacities for STV and RA were 42.93 mg g−1 and 22.96 mg g−1, respectively, and the adsorption selectivity (αSTV/RA) reached 4.35. The adsorption isotherm and kinetic data of MOF-BA-1.0 for RA and STV obeyed the Langmuir isotherm model and pseudo second order kinetic model, respectively. The study demonstrated that MOF-BA-1.0 adsorbent could be used as a potential adsorbent to purify the active ingredients of stevia and obtain a high concentration of RA products.

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Dhakshinamoorthy, Amarajothi, Abdullah M. Asiri, and Hermenegildo García. "Metal-Organic Framework (MOF) Compounds: Photocatalysts for Redox Reactions and Solar Fuel Production." Angewandte Chemie International Edition 55, no. 18 (March 11, 2016): 5414–45. http://dx.doi.org/10.1002/anie.201505581.

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Chen, Shuo, Li-Li Ling, Shun-Feng Jiang, and Hong Jiang. "Selective hydrogenation of nitroarenes under mild conditions by the optimization of active sites in a well defined Co@NC catalyst." Green Chemistry 22, no. 17 (2020): 5730–41. http://dx.doi.org/10.1039/d0gc01835j.

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The defined catalyst (Co@NC) is prepared through the pyrolysis of the Co-centered metal–organic framework (MOF), in which Co active species (Co–Nx, surface Co NPs) and particle size play important roles in the catalytic hydrogenation of aromatic nitro compounds.

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Oliver, Clive. "Porous metal-organic frameworks incorporating mixed ligands." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C1476. http://dx.doi.org/10.1107/s2053273314085234.

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Metal-organic frameworks (MOFs), infinite systems built up of metal ions and organic ligands have been extensively studied in materials and supramolecular chemistry due their structural diversity and application as porous materials, in catalysis, ion exchange, gas storage and purification. [1] A novel, 2-fold interpenetrated, pillared, cadmium metal-organic framework was synthesized using trimesic acid and 1,2-bis(4-pyridyl)ethane.[2] Single crystal X-ray analysis revealed a 2-fold interpenetrated, 3-dimensional framework which exhibits a 3,5-connected network with the Schläfli symbol of [(6^3)(6^9.8)] and hms topology. This compound exhibits a temperature-induced single-to-crystal-single-crystal (SC–SC) transformation upon the release of N,N'-dimethylformamide (stable up to 3000C). SC–SC transformation was also observed when the desolvated form absorbed selected polar and non-polar organic solvents. In addition, gas (N_2, CO_2 and N_2O) sorption experiments were performed showing 2.5% N_2, 4.5% CO_2 and 3.4% N_2O absorption by mass at room temperature and moderate gas pressures (~10 bar). A similar MOF was produced when 1,3,5-benzenetricarboxylic acid was replaced with 5-nitro-1,3-benzenedicarboxylic acid. This MOF displays 4-fold interpenetration and also maintains the host framework structure upon heating.

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Yao, Qingxia, Xiufang Lu, Kaili Liu, Chao Ma, Jie Su, Cong Lin, Dacheng Li, Jianmin Dou, Junliang Sun, and Wenzeng Duan. "An NHC-CuCl functionalized metal–organic framework for catalyzing β-boration of α,β-unsaturated carbonyl compounds." Dalton Transactions 48, no. 16 (2019): 5144–48. http://dx.doi.org/10.1039/c9dt00645a.

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Wu, Ke, Changwen Du, Fei Ma, Yazhen Shen, Dong Liang, and Jianmin Zhou. "Degradation of Metal-Organic Framework Materials as Controlled-Release Fertilizers in Crop Fields." Polymers 11, no. 6 (June 1, 2019): 947. http://dx.doi.org/10.3390/polym11060947.

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The behavior of a metal-organic framework (MOF) compound synthesized in hydrothermal reaction conditions and rich in N, P, and Fe nutrients was explored in the field. The attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy and laser induced breakdown spectroscopy (LIBS) characterization results showed that the chemical structures changed during the degradation process in crop field soil. The scanning electron microscope images showed that the micro-rod of the MOF peeled off and degraded in layers. During the growth period of wheat, the MOF degraded by 50.9%, with the degradation rate being closely related to soil temperature. It was also found that the degradation rate increased with soil temperature. Moreover, the nutrient concentration of the soil indicated that the MOF had stable nutrients release efficiencies and could provide a continuous supply of nutrients throughout the wheat growth period, which showed a great alternative for MOF as a fertilizer both benefiting agricultural production and environmental protection.

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Pu, Yanyan, Zongchao Yu, Fengqin Wang, Yiyuan Fu, Tao Yan, and Honglin Cheng. "Selective fluorescence sensing ofp-nitroaniline and Fe3+ions by luminescent Eu-based metal-organic framework." Sensor Review 39, no. 2 (March 7, 2019): 149–61. http://dx.doi.org/10.1108/sr-08-2017-0153.

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PurposeThe purpose of this study is to develop luminescence sensors for the detection of nitroaromatic compounds (NACs) and metal ions to protect human health and prevent environmental pollution.Design/methodology/approachThe composition and morphology of Eu-metal-organic frameworks (MOF) (1) were well characterized by powder X-ray diffraction, elemental analyses, Fourier-transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and scanning electron microscopy. The emission spectrum displays that 1 has significant characteristic emission bands of Eu(III) ions. The authors further investigated the fluorescence sensing performances of 1 to NACs and metal ions.FindingsThe results show that Eu-MOF (1) exhibits significant fluorescence quenching effect toward p-nitroaniline and Fe3+ions with good stability and recyclability. This means that 1 can be used as a multifunctional sensing material for the detection of p-nitroaniline and Fe3+ions.Originality/valueThe authors have successfully synthesized a fluorescence Eu-based sensing material under hydrothermal conditions. In addition, the fluorescence property and sensing performances for detecting NACs and metal ions were studied. The results suggest that 1 has highly selective fluorescence quenching toward p-nitroaniline and Fe3+ions with not only high sensitivity and selectivity but also excellent stability and recyclability. Furthermore, this study has confirmed that the multifunctional MOF material is very useful in environment pollutants’ detection and monitoring.

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Wang, Xiu-Li, Na Li, Ai-Xiang Tian, Jun Ying, Guo-Cheng Liu, Hong-Yan Lin, and Dan Zhao. "Three 3D Metal-Organic Frameworks Constructed from Keggin Polyanions and Multi-nuclear AgI Clusters: Assembly, Structures and Properties." Zeitschrift für Naturforschung B 68, no. 7 (July 1, 2013): 778–88. http://dx.doi.org/10.5560/znb.2013-3007.

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Three Keggin-based metal-organic frameworks (MOFs) containing multi-nuclear silver subunits, [Ag7(ptz)5(H2O)2][H2SiMo12O40] (1), [Ag8(ptz)5(H2O)2][AsW12O40] (2) and [Ag7(ptz)5(H2O)][HAsMo12O40] (3) (ptzH=5-(4-pyridyl)-tetrazole), have been synthesized under hydrothermal conditions by changing the inorganic polyanions. The new compounds have been characterized by elemental analyses, TG analyses, IR spectroscopy, and single-crystal X-ray diffraction. In compound 1, the multi-nuclear Ag5(ptz)5 subunits are interconnected to form chains, which are further linked by AgI cations to construct a 3D MOF with large channels. Pairs of SiMo12O404- polyanions reside in the channels as penta-dentate inorganic ligands. In 2, six AgI cations link five ptz- anions to construct a hexa-nuclear subunit [Ag6(ptz)5]+, which is interconnected to form chains. These chains are further linked by AgI cations to construct a 3D MOF, where AsW12O403- polyanions reside as hexa-dentate ligands. Compound 3exhibits a 3D MOF based on Ag5(ptz)5 subunits, in which the hexa-dentate AsMo12O403- polyanions are incorporated. The rigid tetrazole-based ligand ptz- plays an important role in the formation of the multi-nuclear subunits of the title compounds. The electrochemical properties of compound 1and the photocatalytic properties of compounds 1and 3have been investigated.

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Cardenas-Morcoso, Drialys, Raya Ifraemov, Miguel García-Tecedor, Itamar Liberman, Sixto Gimenez, and Idan Hod. "A metal–organic framework converted catalyst that boosts photo-electrochemical water splitting." Journal of Materials Chemistry A 7, no. 18 (2019): 11143–49. http://dx.doi.org/10.1039/c9ta01559k.

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Mendes, Ricardo F., Ana D. G. Firmino, João P. C. Tomé, and Filipe A. Almeida Paz. "Metal–organic framework assembled from erbium and a tetrapodal polyphosphonic acid organic linker." Acta Crystallographica Section C Structural Chemistry 74, no. 6 (May 30, 2018): 752–59. http://dx.doi.org/10.1107/s2053229618007374.

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A three-dimensional metal–organic framework (MOF), poly[[μ6-5′-pentahydrogen [1,1′-biphenyl]-3,3′,5,5′-tetrayltetrakis(phosphonato)]erbium(III)] 2.5-hydrate], formulated as [Er(C12H11O12P4)]·2.5H2O or [Er(H5btp)]·2.5H2O (I) and isotypical with a Y3+-based MOF reported previously by our research group [Firmino et al. (2017b). Inorg. Chem. 56, 1193–1208], was constructed based solely on Er3+ and on the polyphosphonic organic linker [1,1′-biphenyl]-3,3′,5,5′-tetrakis(phosphonic acid) (H8btp). The present work describes our efforts to introduce lanthanide cations into the flexible network, demonstrating that, on the one hand, the compound can be obtained using three distinct experimental methods, i.e. hydro(solvo)thermal (Hy), microwave-assisted (MW) and one-pot (Op), and, on the other hand, that crystallite size can be approximately fine-tuned according to the method employed. MOF I contains hexacoordinated Er3+ cations which are distributed in a zigzag inorganic chain running parallel to the [100] direction of the unit cell. The chains are, in turn, bridged by the anionic organic linker to form a three-dimensional 6,6-connected binodal network. This connectivity leads to the existence of one-dimensional channels (also running parallel to the [100] direction) filled with disordered and partially occupied water molecules of crystalization which are engaged in O—H...O hydrogen-bonding interactions with the [Er(H5btp)] framework. Additional weak π–π interactions [intercentroid distance = 3.957 (7) Å] exist between aromatic rings, which help to maintain the structural integrity of the network.

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Kultaeva, Anastasia, Timur Biktagirov, Jens Bergmann, Linda Hensel, Harald Krautscheid, and Andreas Pöppl. "A combined continuous wave electron paramagnetic resonance and DFT calculations of copper-doped 3∞[Cd0.98Cu0.02(prz-trz-ia)] metal–organic framework." Physical Chemistry Chemical Physics 19, no. 46 (2017): 31030–38. http://dx.doi.org/10.1039/c7cp06420a.

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Majid, Mohd Faridzuan, Hayyiratul Fatimah Mohd Zaid, Muhammad Fadhlullah Abd Shukur, Azizan Ahmad, and Khairulazhar Jumbri. "Host–Guest Interactions of Zirconium-Based Metal–Organic Framework with Ionic Liquid." Molecules 28, no. 6 (March 21, 2023): 2833. http://dx.doi.org/10.3390/molecules28062833.

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A metal–organic framework (MOF) is a three-dimensional crystalline compound made from organic ligands and metals. The cross-linkage between organic ligands and metals creates a network of coordination polymers containing adjustable voids with a high total surface area. This special feature of MOF made it possible to form a host–guest interaction with small molecules, such as ionic liquid (IL), which can alter the phase behavior and improve the performance in battery applications. The molecular interactions of MOF and IL are, however, hard to understand due to the limited number of computational studies. In this study, the structural parameters of a zirconium-based metal–organic framework (UiO-66) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [EMIM][TFSI] were investigated via a combined experimental and computational approach using the linker model approach. When IL was loaded, the bond length and bond angle of organic linkers were distorted due to the increased electron density surrounding the framework. The increase in molecular orbital energy after confining IL stabilized the structure of this hybrid system. The molecular interactions study revealed that the combination of UiO-66 and [EMIM][TFSI] could be a promising candidate as an electrolyte material in an energy storage system.

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Liu, Chengxin, Jin Cui, Yufang Wang, and Mingjie Zhang. "A novel two-dimensional metal–organic framework as a recyclable heterogeneous catalyst for the dehydrogenative oxidation of alcohol and the N-arylation of azole compounds." RSC Advances 11, no. 19 (2021): 11739–44. http://dx.doi.org/10.1039/d1ra00248a.

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A novel metal–organic framework (MOF) with two-dimensional (2D) crystal structure was developed using Cu(NO₃)₂·3H₂O and 2,2′,5,5′-tetramethoxy-[1,1′-biphenyl]-4,4′-dicarboxylic acid.

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He, Chenyang, Liangliang Liu, Sergiy Korposh, Ricardo Correia, and Stephen P. Morgan. "Volatile Organic Compound Vapour Measurements Using a Localised Surface Plasmon Resonance Optical Fibre Sensor Decorated with a Metal-Organic Framework." Sensors 21, no. 4 (February 18, 2021): 1420. http://dx.doi.org/10.3390/s21041420.

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A tip-based fibreoptic localised surface plasmon resonance (LSPR) sensor is reported for the sensing of volatile organic compounds (VOCs). The sensor is developed by coating the tip of a multi-mode optical fibre with gold nanoparticles (size: 40 nm) via a chemisorption process and further functionalisation with the HKUST-1 metal–organic framework (MOF) via a layer-by-layer process. Sensors coated with different cycles of MOFs (40, 80 and 120) corresponding to different crystallisation processes are reported. There is no measurable response to all tested volatile organic compounds (acetone, ethanol and methanol) in the sensor with 40 coating cycles. However, sensors with 80 and 120 coating cycles show a significant redshift of resonance wavelength (up to ~9 nm) to all tested volatile organic compounds as a result of an increase in the local refractive index induced by VOC capture into the HKUST-1 thin film. Sensors gradually saturate as VOC concentration increases (up to 3.41%, 4.30% and 6.18% in acetone, ethanol and methanol measurement, respectively) and show a fully reversible response when the concentration decreases. The sensor with the thickest film exhibits slightly higher sensitivity than the sensor with a thinner film. The sensitivity of the 120-cycle-coated MOF sensor is 13.7 nm/% (R2 = 0.951) with a limit of detection (LoD) of 0.005% in the measurement of acetone, 15.5 nm/% (R2 = 0.996) with an LoD of 0.003% in the measurement of ethanol and 6.7 nm/% (R2 = 0.998) with an LoD of 0.011% in the measurement of methanol. The response and recovery times were calculated as 9.35 and 3.85 min for acetone; 5.35 and 2.12 min for ethanol; and 2.39 and 1.44 min for methanol. The humidity and temperature crosstalk of 120-cycle-coated MOF was measured as 0.5 ± 0.2 nm and 0.5 ± 0.1 nm in the humidity range of 50–75% relative humidity (RH) and temperature range of 20–25 °C, respectively.

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Liu, Binyan, Shuhua Zhang, Ming Li, Yu Wang, and Dajiang Mei. "Metal–Organic Framework/Polyvinyl Alcohol Composite Films for Multiple Applications Prepared by Different Methods." Membranes 13, no. 9 (August 24, 2023): 755. http://dx.doi.org/10.3390/membranes13090755.

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The incorporation of different functional fillers has been widely used to improve the properties of polymeric materials. The polyhydroxy structure of PVA with excellent film-forming ability can be easily combined with organic/inorganic multifunctional compounds, and such an interesting combining phenomenon can create a variety of functional materials in the field of materials science. The composite membrane material obtained by combining MOF material with high porosity, specific surface area, and adjustable structure with PVA, a non-toxic and low-cost polymer material with good solubility and biodegradability, can combine the processability of PVA with the excellent performance of porous filler MOFs, solving the problem that the poor machinability of MOFs and the difficulty of recycling limit the practical application of powdered MOFs and improving the physicochemical properties of PVA, maximizing the advantages of the material to develop a wider range of applications. Firstly, we systematically summarize the preparation of MOF/PVA composite membrane materials using solution casting, electrostatic spinning, and other different methods for such excellent properties, in addition to discussing in detail the various applications of MOF/PVA composite membranes in water treatment, sensing, air purification, separation, antibacterials, and so on. Finally, we conclude with a discussion of the difficulties that need to be overcome during the film formation process to affect the performance of the composite film and offer encouraging solutions.

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Huh, Seong. "Direct Catalytic Conversion of CO2 to Cyclic Organic Carbonates under Mild Reaction Conditions by Metal—Organic Frameworks." Catalysts 9, no. 1 (January 2, 2019): 34. http://dx.doi.org/10.3390/catal9010034.

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The reduction of the representative greenhouse gas, carbon dioxide (CO2), is significantly an important theme for the current research in the modern chemical world. For the last two decades, the development of new metal-organic framework (MOF) systems with highly selective capture of CO2, in the presence of other competing gaseous molecules, has flourished to capture or separate CO2 for environmental protection. Nonetheless, the ultimate resolution to lessen the atmospheric CO2 concentration may be in the chemical or electrochemical conversion of CO2 to other compounds. In this context, the catalytic cycloaddition reaction of CO2 into organic epoxides to produce cyclic carbonates is a more attractive method. MOFs are being proven as efficient heterogeneous catalytic systems for this important reaction. In this review, we collected very recent progress in MOF-based catalytic systems, fully operable under very mild reaction conditions (room temperature and 1 atm CO2).

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Fu, Hong-Ru, Ying Zhao, Tao Xie, Min-Le Han, Lu-Fang Ma, and Shuang-Quan Zang. "Stable dye-encapsulated indium–organic framework as dual-emitting sensor for the detection of Hg2+/Cr2O72− and a wide range of nitro-compounds." Journal of Materials Chemistry C 6, no. 24 (2018): 6440–48. http://dx.doi.org/10.1039/c8tc01571f.

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A water-stable porous anionic metal–organic framework (MOF), [(CH₃)₂NH₂][In(TNB)_4/3]·(2DMF)(3H₂O) (1, H₃TNB = 4,4′,4′′-nitrilotribenzoicacid), was synthesized.

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Taghipour, Fatemeh, and Masoud Mirzaei. "A survey of interactions in crystal structures of pyrazine-based compounds." Acta Crystallographica Section C Structural Chemistry 75, no. 3 (February 15, 2019): 231–47. http://dx.doi.org/10.1107/s2053229619002225.

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The important role of pyrazine (pz) and its derivatives in fields such as biochemistry and pharmacology, as well as in the study of magnetic properties, is surveyed. Recognition of these properties without extensive investigations into their structural properties is not possible. This review summarizes interactions that exist between these organic compounds by themselves in the solid state, as well as those in coordination polymers with metal ions and in polyoxometalate-based hybrids. Complexes based on pyrazine ligands can generate metal–organic framework (MOF) structures that bind polyoxometalates (POMs) through covalent and noncovalent interactions. Some biological and magnetic properties involving these compounds are considered and the effect of hydrogen bonding on their supramolecular architectures is highlighted.

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Journal articles on the topic 'Metal Organic Framework (MOF) Compounds'

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