The Experts below are selected from a list of 49743 Experts worldwide ranked by ideXlab platform
Hong-cai Zhou - One of the best experts on this subject based on the ideXlab platform.
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continuous variation of lattice dimensions and pore sizes in metal organic Frameworks
Journal of the American Chemical Society, 2020Co-Authors: Shuai Yuan, Zhehao Huang, Jialuo Li, Tahir Cagin, Liang Feng, Lan Huang, Hong-cai ZhouAbstract:The continuous variation of the lattice metric in metal–organic Frameworks (MOFs) allows precise control over their chemical and physical properties. This has been realized herein by a series of mi...
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pore size reduction in zirconium metal organic Frameworks for ethylene ethane separation
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Yuxiang Wang, Daqiang Yuan, Hong-cai Zhou, Shuai Yuan, Tanay Kundu, Jian Zhang, Shing Bo Peh, Youdong Cheng, Jinqiao Dong, Dan ZhaoAbstract:Engineering metal–organic Frameworks (MOFs) for adsorptive ethylene/ethane separation has shown bright prospects for replacing the energy-intensive cryogenic distillation process. Herein, we demons...
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pore size reduction in zirconium metal organic Frameworks for ethylene ethane separation
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Yuxiang Wang, Daqiang Yuan, Hong-cai Zhou, Shuai Yuan, Tanay Kundu, Jian Zhang, Youdong Cheng, Jinqiao Dong, Zhigang Hu, Dan ZhaoAbstract:Engineering metal–organic Frameworks (MOFs) for adsorptive ethylene/ethane separation has shown bright prospects for replacing the energy-intensive cryogenic distillation process. Herein, we demonstrate that pore size reduction in zirconium metal–organic Frameworks (Zr-MOFs) can significantly improve their ethylene/ethane separation performance. Two Zr-MOFs based on the acetylenedicarboxylate ligand, UiO-66-ADC and NUS-36, are successfully synthesized. Different from UiO-66-ADC with an fcu topology, NUS-36 possesses a bcu network constructed from 8-connected Zr clusters and organic linkers, leading to ultramicropores smaller than 3.6 A. NUS-36 selectively adsorbs C2H4 over C2H6 with a selectivity of 4.1 based on idea adsorbed solution theory (IAST) for an equimolar C2H4/C2H6 mixture at 298 K and 1 bar, contrasting the C2H6/C2H4 selectivity of 1.8 in UiO-66-ADC under the same conditions. The enhanced C2H4 affinity of NUS-36 is attributed to the synergistic enthalpic and entropic effects on gas sorption whi...
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creating hierarchical pores by controlled linker thermolysis in multivariate metal organic Frameworks
Journal of the American Chemical Society, 2018Co-Authors: Liang Feng, Angelo Kirchon, Jialuo Li, Yves J Chabal, Liangliang Zhang, Shuai Yuan, Peng Zhang, Hong-cai ZhouAbstract:Sufficient pore size, appropriate stability, and hierarchical porosity are three prerequisites for open Frameworks designed for drug delivery, enzyme immobilization, and catalysis involving large molecules. Herein, we report a powerful and general strategy, linker thermolysis, to construct ultrastable hierarchically porous metal–organic Frameworks (HP-MOFs) with tunable pore size distribution. Linker instability, usually an undesirable trait of MOFs, was exploited to create mesopores by generating crystal defects throughout a microporous MOF crystal via thermolysis. The crystallinity and stability of HP-MOFs remain after thermolabile linkers are selectively removed from multivariate metal–organic Frameworks (MTV-MOFs) through a decarboxylation process. A domain-based linker spatial distribution was found to be critical for creating hierarchical pores inside MTV-MOFs. Furthermore, linker thermolysis promotes the formation of ultrasmall metal oxide nanoparticles immobilized in an open framework that exhibit...
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interpenetration control in metal organic Frameworks for functional applications
Coordination Chemistry Reviews, 2013Co-Authors: Trevor A. Makal, Hailong Jiang, Hong-cai ZhouAbstract:Abstract Interpenetration in metal–organic Frameworks (MOFs) is an intriguing phenomenon with significant impacts on the structure, porous nature, and functional applications of MOFs. In this review, we provide an overview of interpenetration involved in MOFs or coordination polymers with different dimensionalities and property changes (especially gas uptake capabilities and catalysis) caused by framework interpenetration. Successful approaches for control of interpenetration in MOFs have also been introduced and summarized.
Dan Zhao - One of the best experts on this subject based on the ideXlab platform.
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pore size reduction in zirconium metal organic Frameworks for ethylene ethane separation
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Yuxiang Wang, Daqiang Yuan, Hong-cai Zhou, Shuai Yuan, Tanay Kundu, Jian Zhang, Shing Bo Peh, Youdong Cheng, Jinqiao Dong, Dan ZhaoAbstract:Engineering metal–organic Frameworks (MOFs) for adsorptive ethylene/ethane separation has shown bright prospects for replacing the energy-intensive cryogenic distillation process. Herein, we demons...
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pore size reduction in zirconium metal organic Frameworks for ethylene ethane separation
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Yuxiang Wang, Daqiang Yuan, Hong-cai Zhou, Shuai Yuan, Tanay Kundu, Jian Zhang, Youdong Cheng, Jinqiao Dong, Zhigang Hu, Dan ZhaoAbstract:Engineering metal–organic Frameworks (MOFs) for adsorptive ethylene/ethane separation has shown bright prospects for replacing the energy-intensive cryogenic distillation process. Herein, we demonstrate that pore size reduction in zirconium metal–organic Frameworks (Zr-MOFs) can significantly improve their ethylene/ethane separation performance. Two Zr-MOFs based on the acetylenedicarboxylate ligand, UiO-66-ADC and NUS-36, are successfully synthesized. Different from UiO-66-ADC with an fcu topology, NUS-36 possesses a bcu network constructed from 8-connected Zr clusters and organic linkers, leading to ultramicropores smaller than 3.6 A. NUS-36 selectively adsorbs C2H4 over C2H6 with a selectivity of 4.1 based on idea adsorbed solution theory (IAST) for an equimolar C2H4/C2H6 mixture at 298 K and 1 bar, contrasting the C2H6/C2H4 selectivity of 1.8 in UiO-66-ADC under the same conditions. The enhanced C2H4 affinity of NUS-36 is attributed to the synergistic enthalpic and entropic effects on gas sorption whi...
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Potential applications of Metal-Organic Frameworks
Coordination Chemistry Reviews, 2009Co-Authors: Ryan J. Kuppler, Daren J. Timmons, Qian-rong Fang, Trevor A. Makal, Mark D. Young, Jian Rong Li, Wenjuan Zhuang, Daqiang Yuan, Dan Zhao, Hong-cai ZhouAbstract:Metal-Organic Frameworks have received much attention in recent years especially as newly developed porous materials. As such, they possess a wide array of potential applications including materials for gas storage, gas/vapor separation, catalysis, luminescence, and drug delivery. In the review, these potential applications of Metal-Organic Frameworks are examined and an outlook will be proposed.
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the current status of hydrogen storage in metal organic Frameworks
Energy and Environmental Science, 2008Co-Authors: Dan Zhao, Daqiang Yuan, Hong-cai ZhouAbstract:The theoretical and experimental hydrogen storage studies on metal–organic Frameworks (MOFs) have been reviewed. Seven distinct factors influencing hydrogen uptake capacity in MOFs have been classified and discussed. Based on existing studies, some possible future developments have been proposed.
Stefan Kaskel - One of the best experts on this subject based on the ideXlab platform.
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metal organic Frameworks in germany from synthesis to function
Coordination Chemistry Reviews, 2019Co-Authors: Jack D Evans, Irena Senkovska, Stefan Kaskel, Roland A Fischer, Volodymyr Bon, Bikash Garai, Helge Reinsch, Stefano Dissegna, Christoph Janiak, Norbert StockAbstract:Abstract Metal–organic Frameworks (MOFs) are constructed from a combination of inorganic and organic units to produce materials which display high porosity, among other unique and exciting properties. MOFs have shown promise in many wide ranging applications, such as catalysis and gas separations. In this review, we highlight MOF research conducted by Germany-based research groups. Specifically, we feature approaches for the synthesis of new MOFs, high-throughput MOF production, advanced characterization methods and examples of advanced functions and properties.
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flexible metal organic Frameworks
Chemical Society Reviews, 2014Co-Authors: Andreas Schneemann, Irena Senkovska, Stefan Kaskel, Volodymyr Bon, Inke Schwedler, Roland A FischerAbstract:Advances in flexible and functional metal–organic Frameworks (MOFs), also called soft porous crystals, are reviewed by covering the literature of the five years period 2009–2013 with reference to the early pertinent work since the late 1990s. Flexible MOFs combine the crystalline order of the underlying coordination network with cooperative structural transformability. These materials can respond to physical and chemical stimuli of various kinds in a tunable fashion by molecular design, which does not exist for other known solid-state materials. Among the fascinating properties are so-called breathing and swelling phenomena as a function of host–guest interactions. Phase transitions are triggered by guest adsorption/desorption, photochemical, thermal, and mechanical stimuli. Other important flexible properties of MOFs, such as linker rotation and sub-net sliding, which are not necessarily accompanied by crystallographic phase transitions, are briefly mentioned as well. Emphasis is given on reviewing the recent progress in application of in situ characterization techniques and the results of theoretical approaches to characterize and understand the breathing mechanisms and phase transitions. The flexible MOF systems, which are discussed, are categorized by the type of metal-nodes involved and how their coordination chemistry with the linker molecules controls the framework dynamics. Aspects of tailoring the flexible and responsive properties by the mixed component solid-solution concept are included, and as well examples of possible applications of flexible metal–organic Frameworks for separation, catalysis, sensing, and biomedicine.
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Liquid-phase adsorption on Metal-Organic Frameworks
Adsorption, 2011Co-Authors: Antje Henschel, Irena Senkovska, Stefan KaskelAbstract:This work is focusing on the potential application of Metal-Organic Frameworks as porous materials in heterogeneous catalysis where the substrate is in solution. The understanding of such a liquid-phase heterogeneous catalytic process requires adsorption equilibrium data in solution. For this purpose several Metal-Organic Frameworks were synthesized as reference materials and tested as adsorbents for the adsorption of substrate molecules such as styrene or ethylcinnamate from the liquid phase. The adsorption capacity strongly depends on the polarity of the substrate with respect to the solvent. In several instances solvent and polarity effects are heavily superimposed on the pore size effects. Adsorption isotherms, rates and hydrogenation of the substrates are reported and discussed.
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chiral metal organic Frameworks and their application in asymmetric catalysis and stereoselective separation
Chemie Ingenieur Technik, 2011Co-Authors: Georg Nickerl, Antje Henschel, Ronny Grunker, Kristina Gedrich, Stefan KaskelAbstract:The targeted synthesis of a desired stereomer plays a key role in life sciences, especially in the production of drugs. Up to date, this area is dominated by homogeneous chiral catalysts. Metal-Organic Frameworks (MOFs), a new class of porous materials, consisting of metal-oxo-clusters and multifunctional ligands could offer a platform for chiral heterogeneous catalysts combining the efficiency and in particular selectivity observed for homogeneous asymmetric catalysts with the advantages of heterogeneous catalysis. This review summarizes strategies to obtain chiral Metal-Organic Frameworks and gives an overview about reactions that have been successfully conducted using chiral MOFs as asymmetric catalysts. In addition, some examples highlighting the stereoselective adsorption properties of chiral Metal-Organic Frameworks are given.
Omar M Yaghi - One of the best experts on this subject based on the ideXlab platform.
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Architectural Stabilization of a Gold(III) Catalyst in Metal-Organic Frameworks
Chem, 2019Co-Authors: John S. Lee, Omar M Yaghi, Eugene A. Kapustin, Xiaokun Pei, Sebastián Llopis, F. Dean TosteAbstract:Unimolecular decomposition pathways are challenging to address in transition-metal catalysis and have previously not been suppressed via incorporation into a solid support. Two robust Metal-Organic Frameworks (IRMOF-10 and bio-MOF-100) are used for the architectural stabilization of a structurally well-defined gold(III) catalyst. The inherent rigidity of these materials is utilized to preclude a unimolecular decomposition pathway - reductive elimination. Through this architectural stabilization strategy, decomposition of the incorporated gold(III) catalyst in the Metal-Organic Frameworks is not observed; in contrast, the homogeneous analogue is prone to decomposition in solution. Stabilization of the catalyst in these Metal-Organic Frameworks precludes leaching and enables recyclability, which is crucial for productive heterogeneous catalysis.
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metal organic Frameworks with designed chiral recognition sites
Chemical Communications, 2010Co-Authors: Cory Valente, Omar M Yaghi, Eunwoo Choi, Matthew E. Belowich, Christian J. Doonan, Travis B. Gasa, Youssry Y. Botros, Fraser J StoddartAbstract:Linking struts containing Cram-like bisbinaphthyl[22]crown-6 with Zn4O(CO2)6 joints affords metal–organic Frameworks with chiral recognition sites that are highly designed, ordered and placed in a precise manner throughout the entire crystal.
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secondary building units nets and bonding in the chemistry of metal organic Frameworks
Chemical Society Reviews, 2009Co-Authors: David J Tranchemontagne, Michael Okeeffe, Jose L Mendozacortes, Omar M YaghiAbstract:This critical review presents a comprehensive study of transition-metal carboxylate clusters which may serve as secondary building units (SBUs) towards construction and synthesis of metal–organic Frameworks (MOFs). We describe the geometries of 131 SBUs, their connectivity and composition. This contribution presents a comprehensive list of the wide variety of transition-metal carboxylate clusters which may serve as secondary building units (SBUs) in the construction and synthesis of metal–organic Frameworks. The SBUs discussed here were obtained from a search of molecules and extended structures archived in the Cambridge Structure Database (CSD, version 5.28, January 2007) which included only crystals containing metal carboxylate linkages (241 references).
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Exceptional H2 saturation uptake in microporous Metal-Organic Frameworks
Journal of the American Chemical Society, 2006Co-Authors: Antek G. Wong-foy, Adam J Matzger, Omar M YaghiAbstract:Saturation H2 uptake in a series of microporous metal?organic Frameworks (MOFs) has been measured at 77 K. Saturation pressures vary between 25 and 80 bar across the series, with MOF-177 showing the highest uptake on a gravimetric basis (7.5 wt %) and IRMOF-20 showing the highest uptake on a volumetric basis at 34 g/L. These results demonstrate that maximum H2 storage capacity in MOFs correlates well to surface area, and that feasible volumetric uptakes can be realized even in highly porous materials.
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Strategies for hydrogen storage in Metal-Organic Frameworks
Angewandte Chemie - International Edition, 2005Co-Authors: Jesse L. C. Rowsell, Omar M YaghiAbstract:Increased attention is being focused on Metal-Organic Frameworks as candidates for hydrogen storage materials. This is a result of their many favorable attributes, such as high porosity, reproducible and facile syntheses, amenability to scale-up, and chemical modification for targeting desired properties. A discussion of several strategies aimed at improving hydrogen uptake in these materials is presented. These strategies include the optimization of pore size and adsorption energy by linker modification, impregnation, catenation, and the inclusion of open metal sites and lighter metals.
Banglin Chen - One of the best experts on this subject based on the ideXlab platform.
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metal organic Frameworks for luminescence thermometry
Chemical Communications, 2015Co-Authors: Yuanjing Cui, Banglin Chen, Fengliang Zhu, Guodong QianAbstract:Metal–organic Frameworks (MOFs) hold great promise for developing various types of luminescent sensors due to their remarkable structural diversity and tunable luminescence properties. In the last few years, utilizing luminescent MOFs to explore temperature sensing has gained intense attention. In this feature article, after the general description of luminescence thermometry, we have summarized the recent progress made in luminescent MOF thermometers, with particular emphasis on the dual-emitting MOFs that effectively illustrate the self-referencing temperature measurement based on the intensity ratios of two separate transitions.
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methane storage in metal organic Frameworks
Chemical Society Reviews, 2014Co-Authors: Wei Zhou, Guodong Qian, Banglin ChenAbstract:Natural gas (NG), whose main component is methane, is an attractive fuel for vehicular applications. Realization of safe, cheap and convenient means and materials for high-capacity methane storage can significantly facilitate the implementation of natural gas fuelled vehicles. The physisorption based process involving porous materials offers an efficient storage methodology and the emerging porous metal–organic Frameworks have been explored as potential candidates because of their extraordinarily high porosities, tunable pore/cage sizes and easily immobilized functional sites. In this view, we provide an overview of the current status of metal–organic Frameworks for methane storage.
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metal organic Frameworks for photonics applications
2014Co-Authors: Banglin Chen, Guodong Qian, X M ChenAbstract:Design and Construction of Metal-Organic Frameworks.- Luminescent Properties and Applications of Metal-Organic Frameworks.- Metal-Organic Frameworks for Photocatalysis.- Photochemical Transformation within Metal-Organic Frameworks.- Metal-Organic Frameworks for Nonlinear Optics.- Host-Guest Metal-Organic Frameworks for Photonics.
