Article
Nanoscience & Nanotechnology
Ying Yang, Hyunho Noh, Qing Ma, Rui Wang, Zhihengyu Chen, Neil M. Schweitzer, Jian Liu, Karena W. Chapman, Joseph T. Hupp
Summary: A strategy for synthesizing sub-nanometer to 2 nm metal clusters and particles was successfully demonstrated, utilizing a combination of a metal-organic framework (MOF) and dendrimer templates to improve synthesis and create stable, efficient heterogeneous catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Se-Na Kim, Chun Gwon Park, Chang Hee Min, Seung Ho Lee, Yun Young Lee, Na Kyeong Lee, Young Bin Choy
Summary: The shape of Fe-based MOF nanoparticles affects cellular uptake, with octahedral nanoparticles showing faster uptake and rod-shaped nanoparticles showing sustained uptake. This finding provides important information for the application of MOF nanoparticles as intracellular drug delivery carriers.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Rahul Kalita, Wahida Begum, Poorvi Gupta, Manav Chauhan, Naved Akhtar, Rajashree Newar, Kuntal Manna
Summary: This research reports on the synthesis and characterization of an aluminum metal-organic framework node-supported copper(II) chloride catalyst, which efficiently oxidizes alkenes to carbonyl or diol compounds using H2O2 as an oxidizing agent. The catalyst exhibits excellent selectivity and can be recycled, highlighting the importance of MOF-supported metal catalysts for oxidation reactions.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Jian Zheng, Laura Loebbert, Saumil Chheda, Navneet Khetrapal, Julian Schmid, Carlo Alberto Gaggioli, Benjamin Yeh, Ricardo Bermejo-Deval, Radha Kishan Motkuri, Mahalingam Balasubramanian, John L. Fulton, Oliver Y. Gutierrez, J. Ilja Siepmann, Matthew Neurock, Laura Gagliardi, Johannes A. Lercher
Summary: Homotopic sites are ideal for mechanistic studies and optimal control of catalytic transformations. Nickel cations in different environments show different selectivity in the reaction of 1-butene, and the reaction mechanism follows the Cossee-Arlman mechanism.
JOURNAL OF CATALYSIS
(2022)
Review
Chemistry, Multidisciplinary
Grace C. Thaggard, Johanna Haimerl, Roland A. Fischer, Kyoung Chul Park, Natalia B. Shustova
Summary: This survey summarizes the recent advances in stimuli-responsive catalysis in the last five years, focusing on novel directions and applications. Metal-free catalysts, organometallic complexes, biomimetic systems, and extended structures that display switchable catalytic activity are discussed. The detailed discussion highlights light-activated systems composed of photochromic molecules capable of modulating reaction rate, yield, or enantioselectivity based on geometric and electronic changes associated with photoisomerization. Alternative stimuli such as pH and temperature, alone or in combination with light, are also addressed. The recent advances demonstrate that the ability to finely tune catalyst behavior via an external stimulus is a powerful tool that can revolutionize sustainable chemistry.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Zi Wang, Alena M. Sheveleva, Daniel Lee, Yinlin Chen, Dinu Iuga, W. Trent Franks, Yujie Ma, Jiangnan Li, Lei Li, Yongqiang Cheng, Luke L. Daemen, Sarah J. Days, Anibal J. Ramirez-Cuesta, Bing Han, Alexander S. Eggeman, Eric J. L. McInnes, Floriana Tuna, Sihai Yang, Martin Schroder
Summary: We have investigated the reactivity modulation of nitrogen dioxide (NO2) by a charged metal-organic framework (MOF) material, MFM-305-CH3. Methylated unbound N-centres and Cl- ions in the pores are used to balance the cationic charge. The uptake of NO2 into MFM-305-CH3 leads to the reaction between NO2 and Cl- to form nitrosyl chloride (NOCl) and NO3- anions. The study provides insights into the binding domains and reactivity of adsorbed NO2 molecules within MFM-305-CH3 and MFM-305.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Chun Li, Abhinav Chandresh, Zejun Zhang, Sarah Moulai, Lars Heinke
Summary: The study investigates the stability of four common MOFs, UiO-66, UiO-67, HKUST-1, and ZIF-8, under long-term exposure to humid air and water vapor. The results show that UiO-66 and ZIF-8 maintain their structure stability while HKUST-1 undergoes structural decomposition and degradation of uptake properties in air. UiO-67 experiences a decrease in uptake amount and rate under air exposure, indicating the formation of surface barriers for mass transfer.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Peter Thissen, Jonas Wohlgemuth, Peter Weidler, Detlef Smilgies, Lars Heinke, Nils Schewe, Meike Koenig, Peter Krolla, Christof Woell
Summary: The properties of metal-organic frameworks (MOFs) are highly influenced by defect concentrations. A method has been developed to grow MOFs epitaxially on cm-sized Si(111) single crystals, resulting in nearly perfect structure with low defect density. Synchrotron-based grazing incidence X-ray diffraction (GI-XRD) experiments confirmed the high registry between crystalline metal-organic thin films and the substrate. The reduction of MOF defect density has significant effects on the properties of these porous frameworks, particularly in mass transport where a 10-fold increase in diffusion coefficient of guest molecules is observed.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kristen A. Colwell, Megan N. Jackson, Rodolfo M. Torres-Gavosto, Sudi Jawahery, Bess Vlaisavljevich, Joseph M. Falkowski, Berend Smit, Simon C. Weston, Jeffrey R. Long
Summary: This study demonstrates the effectiveness of using noncoordinating buffers to independently control reaction pH during metal-organic framework synthesis, showing the role of coordinators in governing crystal morphology. Experimental and theoretical calculations reveal that crystal growth along a specific direction can be controlled by varying the coordination strength, ultimately impacting gas diffusion pathways.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Madeleine A. Gaidimas, Florencia A. Son, Mohammad Rasel Mian, Timur Islamoglu, Omar K. Farha
Summary: Hydrocarbon transport in metal-organic frameworks (MOFs) has been studied to understand their potential for energy-efficient separations. This research investigates the influence of pore size on hydrocarbon diffusion in two isoreticular MOFs and identifies the rate-limiting diffusion mechanism and trends in hydrocarbon surface permeabilities.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Organic
Zhihao Guo, Huanan Wen, Guixia Liu, Zheng Huang
Summary: The regio- and stereoselective hydrosilylation of 1,3-enynes with primary and secondary silanes to access 1,3-dienylsilanes using an iron precatalyst with IPO ligand demonstrates mild conditions, broad substrate scope, and good functional group tolerance. The synthetic utility of the reaction was further validated by gram-scale reactions and subsequent transformations.
Article
Engineering, Chemical
Chenghui Zhang, Xinglong Dong, Yongwei Chen, Houxiao Wu, Liang Yu, Kang Zhou, Ying Wu, Qibin Xia, Hao Wang, Yu Han, Jing Li
Summary: Efficient separation of Xenon (Xe) and krypton (Kr) is achieved using MOF-11 with optimal pore size and accessible open metal sites (OMSs). The material demonstrates high Xe uptake and selectivity through discriminable van der Waals interactions between Xe and Kr, setting a new benchmark for Xe/Kr separation. The strategy presented in this work showcases a balance between uptake and selectivity by leveraging the synergy between optimal pore size and OMSs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Hongmin Su, Yang Zhou, Tao Huang, Fuxing Sun
Summary: Medi-MOF-1 is a porous Metal-Organic framework (MOF) made of Zn(II) and curcumin. The crystal obtained was characterized using powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). A micrometer-sized crystal with similar morphology was successfully obtained using the solvothermal method. Thanks to its high surface area, stability, and abundant pores, the as-synthesized Medi-MOF-1 can be used to adsorb various gases (H-2, CO2, CH4, and N-2) and iodine (I-2). The activated sample showed a high I-2 adsorption ability of 1.936 g g(-1) at room temperature through vapor diffusion. Additionally, the adsorbed I-2 could be released slowly in ethanol, indicating its potential application for iodine adsorption.
Article
Chemistry, Multidisciplinary
Aisha Asghar, Naseem Iqbal, Tayyaba Noor, Benson M. Kariuki, Luke Kidwell, Timothy L. Easun
Summary: In this study, Mn-DABDC MOF was successfully synthesized using both electrochemical and conventional solvothermal methods, with the optimized electrochemical conditions leading to high yield and reduced synthesis cost. The electrochemically synthesized MOF exhibited high carbon dioxide and hydrogen uptake capacities. This study represents the first successful electrochemical synthesis of an amine-based manganese MOF with potential for cost-effective large-scale production.
Article
Chemistry, Multidisciplinary
Jiaran Li, Li Luo, Le Yang, Chaoyang Zhao, Yibang Liu, Zhixin Wu, Xiaoyan Luo, Jinqing Lin
Summary: In this study, an ionic framework constructed from protic imidazolium ionic liquid units through ionic and hydrogen bonding interactions was synthesized for selective ammonia uptake. The investigation of NH3 uptake mechanism showed that the acid sites in the framework would be frustrated when contacted with NH3, leading to NH3 capture by hydrogen bonding and physical interactions.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Zejun Zhang, Chun Li, Abhinav Chandresh, Lars Heinke
Summary: Three methods for quantifying the ion conductivity of IL@MOF via electrochemical impedance spectroscopy (EIS) were compared. The results show that removing excess IL enables the experimental quantification of the intrinsic IL@MOF conductivity.
Article
Chemistry, Physical
Chun Li, Zejun Zhang, Lars Heinke
Summary: The intermolecular guest-guest interaction, controlled by the pore size of Zr-based MOFs, has a significant impact on the release kinetics. Molecular clusters, most likely toluene dimers, form and their break-up becomes rate-limiting during the desorption process, resulting in a step-like desorption kinetics. Temperature-dependent experiments show that the release rates are independent of temperature at the same toluene loadings, and the activation energy for release coincides with the binding energy of a toluene dimer.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Abhinav Chandresh, Christof Woell, Lars Heinke
Summary: This study demonstrates the precise deposition of nanoporous metal-organic frameworks on graphene, yielding bilayers with excellent specificity and high sensitivity. This approach can solve the low specificity issue of graphene in sensor applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Benedikt Zerulla, Chun Li, Dominik Beutel, Simon Osswald, Christof Holzer, Jochen Buerck, Stefan Braese, Christof Woell, Ivan Fernandez-Corbaton, Lars Heinke, Carsten Rockstuhl, Marjan Krstic
Summary: Electronic circular dichroism is an important optical phenomenon for studying chiral molecular materials. Metal-organic frameworks (MOFs) are crystalline porous thin-film materials with tailored chemical and physical properties. Combining these two aspects, researchers aim to create devices with unprecedented functionality. However, advanced modeling techniques are needed to address the complexity of material choices and structural details. A computational workflow that combines quantum chemical methods with optical simulations is proposed, focusing on chiral properties in UiO-67-BINOL MOFs.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yunzhe Jiang, Yidong Liu, Sylvain Grosjean, Volodymyr Bon, Patrick Hodapp, Anemar Bruno Kanj, Stefan Kaskel, Stefan Braese, Christof Woell, Lars Heinke
Summary: In this research, we achieved a directed responsive behavior of light-induced deformation by assembling light-powered molecules into a surface-mounted metal-organic framework film. The molecular extension changes were multiplied at the mesoscopic scale and transferred to the macroscopic scale, resulting in the bending of a cantilever and performing work.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Jan C. Fischer, Chun Li, Sebastian Hamer, Lars Heinke, Rainer Herges, Bryce S. Richards, Ian A. Howard
Summary: For optoelectronic applications, highly oriented metal-organic framework (MOF) thin films and heterostructures are crucial. Detailed structural characterization of the deposited films is necessary for process optimization. The 2D grazing-incidence wide-angle X-ray scattering (GIWAXS) data from a laboratory system can provide valuable information for structural models, quantitative estimate of desired surface-oriented texture, and depth-dependent characterization for heterostructures. This study demonstrates the potential of GIWAXS in understanding MOF thin films and achieving desired film orientation and heterostructure optimization.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhiyun Xu, Yidong Liu, Abhinav Chandresh, Palas Baran Pati, Vincent Monnier, Lars Heinke, Fabrice Odobel, Stephane Diring, Ritesh Haldar, Christof Woell
Summary: This study investigates a metal-organic framework (MOF) thin film based on nanographene, which exhibits excellent performance in optoelectronic applications through photo-induced ligand-to-metal charge transfer.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Chemical
Anemar Bruno Kanj, Lars Heinke
Summary: The mass transfer in a film of metal-organic framework with one-dimensional pores was studied using gravimetric methods. The diffusion coefficients of cyclohexane and p-xylene were determined from transient uptake measurements. While the mass transfer of p-xylene in the MOF pores was slower than that of cyclohexane, a single-file diffusion situation, where mutual passage is hindered, was not observed, indicating that other mechanisms are responsible for the slower mass transfer.
CHEMIE INGENIEUR TECHNIK
(2023)
Article
Chemistry, Multidisciplinary
Kuo Zhan, Yunzhe Jiang, Peng Qin, Yunlin Chen, Lars Heinke
Summary: This study presents a label-free, colorimetric sensor array consisting of metal-organic-framework-based (MOF-based) Fabry-Perot (FP) films. The sensor can accurately detect and classify volatile organic compounds (VOCs) using either optical spectra or pictures taken with a smartphone camera. It has potential applications in exploring food alteration and spoilage.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Sandeep Kumar, Simone Dehm, Laura Wieland, Abhinav Chandresh, Lars Heinke, Benjamin S. Flavel, Ralph Krupke
Summary: This study presents a high-sensitive and low-power sensing platform for detecting ethanol molecules. The platform integrates large-diameter carbon nanotube transistors with a metal-organic framework layer, allowing for detection of ethanol concentrations at sub-ppb levels with extremely low power consumption.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kuo Zhan, Yunzhe Jiang, Lars Heinke
Summary: This article presents an optical sensor array that utilizes photonic Fabry-Perot films made of surface-mounted metal-organic frameworks (SURMOFs) with different homochiral structures. It is capable of detecting and enantioselectively discriminating between 3 pairs of chiral odor molecules, whether in their pure form or in binary mixtures.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Alexei Nefedov, Chun Li, Kai Mueller, Anemar Bruno Kanj, Lars Heinke, Chen Luo, Kai Chen, Florin Radu, Evangelos Golias, Wolfgang Kuch, Christof Woell
Summary: Metal-organic frameworks (MOFs) are crystalline and porous, molecular solids consisting of metal nodes and organic ligands. In this study, the magnetic properties of two SURMOF-2 systems (Cu(bdc) and Cu(bpdc)) were investigated using x-ray magnetic circular dichroism. The presence of the ferromagnetic phase in these SURMOF-2 systems was confirmed. The magnetic behavior of the guest molecules differed from that of the host matrix after loading.
Article
Chemistry, Multidisciplinary
Zejun Zhang, Donghui Chen, Dragos Mutruc, Stefan Hecht, Lars Heinke
Summary: In this study, a nanoporous film with controllable wettability was developed by utilizing a metal-organic framework material containing azobenzene and reversible incorporation of guest molecules. The water contact angle could be modified over a wide range using both optical and chemical stimuli, showcasing its potential in various applications.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Peng Qin, Salih Okur, Yunzhe Jiang, Lars Heinke
Summary: The detection of CO2 is important and can be improved using metal-organic frameworks (MOFs) and ionic liquids (ILs). Researchers have developed a low-cost and portable CO2 sensor system using a gravimetric sensor array with MOF films embedded with ILs. The sensor array, combined with machine learning, can quantify CO2 concentration and distinguish it from other gases and vapors.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
