Review
Chemistry, Multidisciplinary
Nataliia Vereshchuk, Marcos Gil-Sepulcre, Abolfazl Ghaderian, Jan Holub, Carolina Gimbert-Surinach, Antoni Llobet
Summary: Today, sustainable and clean energy conversion strategies rely on sunlight and water as sources of protons and electrons, similar to Photosystem II. However, the thermodynamics and complexity of the water oxidation reaction make it difficult to find efficient and stable molecules capable of achieving this task. Ru coordination complexes have been identified as some of the best understood water oxidation catalysts, and their catalytic performance and key factors influencing their performance have been extensively studied.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Applied
Kai Zhang, Lingbo Zong, Xiaofei Jia
Summary: A series of pyridine functionalized porous organic polymers were synthesized and showed high catalytic activity in the N-formylation of various primary and secondary amines. The Ru/POP3-Py&PPh3 catalyst exhibited good yields and could be easily separated and reused for multiple cycles in the N-formylation of morpholine.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Applied
Zhifeng Dai, Yongquan Tang, Fei Zhang, Yubing Xiong, Sai Wang, Qi Sun, Liang Wang, Xiangju Meng, Leihong Zhao, Feng-Shou Xiao
Summary: The study focuses on the transformation of CO2 into cyclic carbonates, using a series of porous organic catalysts that show excellent recyclability and catalytic performance. These catalysts hold promise for converting industrially generated CO2 into high value-added chemicals.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Aljaz Skrjanc, Dominik Jankovic, Anton Meden, Matjaz Mazaj, Erik Svensson Grape, Martin Gazvoda, Natasa Zabukovec Logar
Summary: This study reports the synthesis of the first Ni-based ZIFs and demonstrates their high potential as heterogeneous catalysts for the Suzuki-Miyaura cross-coupling reaction. The presence and arrangement of the carbonyl functional groups on the imidazole linker play a crucial role in completing the preferred octahedral coordination of nickel, providing a promising platform for the rational design of Ni-based ZIFs for a wide range of catalytic applications.
Review
Chemistry, Multidisciplinary
Ana Sousa-Castillo, Andrea Marino-Lopez, Begona Puertolas, Miguel A. Correa-Duarte
Summary: Bioorthogonal chemistry has provided a powerful tool for performing biocompatible chemospecific reactions in living systems, particularly in the areas of genetic encoding systems, bioimaging, and cancer therapy. This Minireview focuses on recent advances in the use of heterogeneous catalysts for bioorthogonal reactions, discussing the synthetic strategies of Pd-, Au-, and Cu-based materials, their applications in activating caged fluorophores and prodrugs, and the potential of using external stimuli for targeted drug release in diseased tissues. The review also highlights future directions and challenges in this emerging field.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Sharda Pasricha, Ankita Chaudhary, Abhay Srivastava
Summary: Covalent organic frameworks (COFs) are crystalline porous organic polymers with robust and pre-designable architecture and high crystallinity. This review discusses their design strategies and applications in carbon-carbon bond formation reactions. It also examines the reactivity, stability, and selectivity of COF-based catalysts, as well as the challenges and future prospects of functionalized COF-based catalysts.
Article
Chemistry, Multidisciplinary
Yuki Saito, Shu Kobayashi
Summary: The application of heterogeneous catalysts in continuous-flow enantioselective hydroacylation reactions was studied. Catalysts were prepared by mixing supports and rhodium complexes, and showed excellent activity and enantioselectivity. Under optimized conditions, the catalysts exhibited high turnover numbers and could be applied to various substrates. Furthermore, sequential-flow reactions with other heterogeneous catalysts were demonstrated for the synthesis of biologically active molecules and functional materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Ruidong Gao, Guang Zhang, Fanli Lu, Long Chen, Yang Li
Summary: In this study, two new pyrrole-based CMPs with large specific surface areas and good stabilities were successfully prepared by one-step oxidative self-polycondensation. Both CMPs exhibited high catalytic activity towards Knoevenagel condensation reaction, attributed to the inherent pore channels, high specific surface areas, and abundant nitrogen sites within CMPs. Additionally, both CMPs displayed excellent recyclability with negligible degradation after 10 cycles, providing new possibilities for designing novel nitrogen-rich high-performance heterogeneous catalysts.
FRONTIERS IN CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Guoli Chen, Rengui Li, Lei Huang
Summary: Photochemical deposition has gained increasing attention as a method for preparing nano-catalysts due to its mild reaction conditions, simplicity, green and safe characteristics, and potential for various applications. This review provides an overview of recent advances in photochemical deposition methods for fabricating heterogeneous catalysts, with a focus on the factors influencing the nucleation and growth of metal nanoparticles. The control of photogenerated charges and triggered photochemical reactions has been shown to be significant in the deposition process.
Article
Polymer Science
Eduard Karakhanov, Anton Maximov, Anna Zolotukhina
Summary: This article reviews the recent advances and applications of dendritic catalysis in the past two decades, with a focus on heterogeneous dendrimer-based catalysts. Three main approaches to synthesizing immobilized heterogeneous dendrimer-based catalysts are considered, and magnetically separable dendritic catalysts are also discussed. These dendritic catalysts can be stored as powders and easily separated from the reaction medium, maintaining efficiency similar to homogeneous dendritic catalysts.
Review
Chemistry, Multidisciplinary
Lifei Lian, Huaiying Zhang, Sai An, Wei Chen, Yu-Fei Song
Summary: POMs, as a class of discrete anionic metal-oxygen clusters with tunable structure, exhibit super strong Bransted acidity, high proton mobility, and thermal stability, making them potential green alternatives to conventional homogeneous acid catalysts. Through design strategies such as functionalized cations, covalent interactions, non-precious metal support, and porous polymer framework, POMs-based heterogeneous catalysts have shown excellent catalytic performance in specific acid-catalyzed reactions.
SCIENCE CHINA-CHEMISTRY
(2021)
Article
Chemistry, Physical
Yanming Zhao, Yunlei Peng, Chuan Shan, Zhou Lu, Lukasz Wojtas, Zhenjie Zhang, Bao Zhang, Yaqing Feng, Shengqian Ma
Summary: Metallocorrole macrocycles are an emerging and attractive class of metal complexes from the porphyrinoid family, which have attracted great interest in recent years due to their unique structure and excellent performance in various fields. The targeted synthesis of porous organic polymers (POPs) constructed from custom-designed Mn and Fe-corrole complex building units shows superior catalytic activity for the solvent-free cycloaddition of carbon dioxide with epoxides, providing potential for CO2 transformations and the development of more multifunctional corrole-based materials for extended applications.
Article
Chemistry, Applied
Tiago F. Machado, Artur J. M. Valente, M. Elisa Silva Serra, Dina Murtinho
Summary: Porous Organic Polymers (POPs) are versatile materials with high potential in organic catalysis. Nitrogen-rich POPs with -OH phenolic groups were synthesized under mild reaction conditions and showed excellent catalytic activity in metal-free Henry and Knoevenagel condensation reactions.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Yang Chen, Jian Lin, Qin Pan, Xu Liu, Tianyi Ma, Xiaodong Wang
Summary: Dual-atom catalysts (DACs) have become a new frontier in heterogeneous catalysis due to their unique intrinsic properties. The synergy between dual atoms provides flexible active sites, promising to enhance performance and even catalyze more complex reactions. However, precisely regulating active site structure and uncovering dual-atom metal interaction remain grand challenges.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Zhifeng Dai, Yang Long, Jianliang Liu, Yuanfei Bao, Liping Zheng, Jiacong Ma, Jiayi Liu, Fei Zhang, Yubing Xiong, Ji-Qing Lu
Summary: We reported two polar group-functionalized porous ionic polymers as efficient bifunctional heterogeneous catalysts for the cycloaddition reaction of CO2 with epoxides. The catalysts exhibited comparable activity to homogeneous catalysts and higher activity than a post-modified catalyst.
Article
Chemistry, Multidisciplinary
Shulin Chen, Jiayi Wang, Simil Thomas, Wasim J. J. Mir, Bingyao Shao, Jianxun Lu, Qingxiao Wang, Peng Gao, Omar F. F. Mohammed, Yu Han, Osman M. M. Bakr
Summary: Inorganic halide perovskite nanocrystals (NCs) are extensively studied as next-generation optoelectronic materials. The atomic structure at the surface of CsPbBr3 NCs is directly observed, revealing a Cs-Br terminated surface with a significantly decreased Cs-Cs bond length, inducing compressive strain and polarization. Density functional theory calculations suggest that this reconstructed surface contributes to the separation of holes and electrons. These findings enhance our understanding of the surface structure and provide insights for designing stable and efficient optoelectronic devices.
Article
Optics
Kostiantyn Sakhatskyi, Bekir Turedi, Gebhard J. Matt, Erfu Wu, Anastasiia Sakhatska, Vitalii Bartosh, Muhammad Naufal Lintangpradipto, Rounak Naphade, Ivan Shorubalko, Omar F. Mohammed, Sergii Yakunin, Osman M. Bakr, Maksym V. Kovalenko
Summary: We demonstrate single-photon counting and long-term stability of perovskite X-ray detectors in the photovoltaic mode, using thick and uniform methylammonium lead iodide single-crystal films (up to 300 μm) and solution directly grown on hole-transporting electrodes. These findings pave the path for the implementation of hybrid perovskites in low-cost, low-dose commercial detector arrays for X-ray imaging with single-photon sensitivity.
Article
Chemistry, Physical
Zhiming Zhao, Binbin Nian, Yongjiu Lei, Yizhou Wang, Lin Shi, Jian Yin, Omar F. Mohammed, Husam N. Alshareef
Summary: Nanoscale Zn2+ channels have been successfully engineered in a plastic-crystal electrolyte, enabling fast Zn2+ solid-state transport and high conductivity. This work offers new perspectives for developing super multivalent ion conductors.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Razan O. Nughays, Chen Yang, Sarvarkhodzha Nematulloev, Jun Yin, George T. Harrison, Jianfeng Zhao, Shadi Fatayer, Osman M. Bakr, Omar F. Mohammed
Summary: Understanding charge carrier dynamics at the nanometer and femtosecond scales is crucial for optimizing light-conversion devices. The authors used ultrafast scanning electron microscopy (USEM) to investigate the effect of surface orientations and termination on charge carriers in MAPbI(3) perovskite single crystals. Results showed facet-dependent diffusion, surface trap density, surface work function, and carrier concentration. Optimization of perovskite surfaces based on these findings could lead to more efficient and stable solar-cell devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Arianna Creti, Mauro Lomascolo, Yuhai Zhang, Maria Luisa De Giorgi, Omar F. Mohammed, Marco Anni
Summary: In this work, the photophysics of CsPbBr3 nanocrystal films were investigated using temperature-dependent steady state and time-resolved photoluminescence measurements. It was found that both free excitons and localized excitons contribute to the nanocrystal emission, and electron traps within the conduction band play a crucial role in thermal emission quenching. Additionally, non-exponential photoluminescence relaxation dynamics were attributed to short-range energy migration within a disordered distribution of localized states at low temperatures and a long-range diffusion process at higher temperatures. Ageing effects were also observed, which resulted in variations in defect levels, exciton-phonon coupling, and exciton relaxation dynamics. These findings significantly enhance our understanding of the photophysics of CsPbBr3 nanocrystal films and ageing effects, and could guide the characterization of similar materials in the future.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jian-Xin Wang, Jun Yin, Luis Gutierrez-Arzaluz, Simil Thomas, Wenyi Shao, Husam N. Alshareef, Mohamed Eddaoudi, Osman M. Bakr, Omar F. Mohammed
Summary: X-ray imaging technology is crucial in various aspects of daily life, such as medical radiography and security screening. However, existing organic chromophores used as X-ray imaging scintillators often exhibit poor performance due to weak X-ray absorption and inefficient exciton utilization. In this study, a high-performance organic scintillator based on singlet fission is presented, which shows near unity exciton utilization efficiency. The scintillator's X-ray sensitivity and imaging resolution are significantly improved by efficient energy transfer from a thermally activated delayed fluorescence sensitizer, harnessing both singlet and triplet excitons. The fabricated singlet fission-based scintillator demonstrates a high X-ray imaging resolution of 27.5 line pairs per millimeter (lp mm(-1)), surpassing most commercial scintillators and indicating its potential use in medical radiography and security inspection.
Article
Chemistry, Multidisciplinary
Hong Wang, Jian-Xin Wang, Xin Song, Tengyue He, Yang Zhou, Osama Shekhah, Luis Gutierrez-Arzaluz, Mehmet Bayindir, Mohamed Eddaoudi, Osman M. Bakr, Omar F. Mohammed
Summary: Lead-free organic metal halide scintillators with low-dimensional electronic structures have shown great potential in X-ray detection and imaging. The organic copper halide CNCI was successfully used to fabricate X-ray scintillators with high sensitivity and resolution. By using a silicon template, the spatial imaging resolution of the CNCI scintillator was further improved.
ACS CENTRAL SCIENCE
(2023)
Article
Multidisciplinary Sciences
Yongjiu Lei, Wenli Zhao, Jun Yin, Yinchang Ma, Zhiming Zhao, Jian Yin, Yusuf Khan, Mohamed Nejib Hedhili, Long Chen, Qingxiao Wang, Youyou Yuan, Xixiang Zhang, Osman M. Bakr, Omar F. Mohammed, Husam N. Alshareef
Summary: The three-proton intercalation mechanism in α-molybdenum trioxide is uncovered using a specially designed electrolyte, leading to an improved specific discharge capacity. Experimental and theoretical evidence verifies the semiconductor-to-metal transition behavior and the expansion of lattice interlayers after proton trapping. Fracture behavior is observed during the proton intercalation process, creating diffusion channels for hydronium ions. Additionally, an additional redox behavior at low potential is observed, contributing to an enhanced specific discharge capacity of α-molybdenum trioxide.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jian-Xin Wang, Indranil Dutta, Jun Yin, Tengyue He, Luis Gutierrez-Arzaluz, Osman M. Bakr, Mohamed Eddaoudi, Kuo-Wei Huang, Omar F. Mohammed
Summary: In this study, a highly efficient and reabsorption-free transparent X-ray imaging scintillator was fabricated by utilizing an efficient triplet-triplet energy transfer strategy between TADF-Br and Ir-OMC. The experiments and calculations showed that efficient energy transfer from TADF-Br to Ir-OMC can be achieved, leading to enhanced triplet-state radioluminescence upon X-ray irradiation. The fabricated scintillator achieved a high X-ray imaging resolution of 19.8 lp mm -1 .
Article
Chemistry, Multidisciplinary
Lijie Wang, Hong Wang, Razan Nughays, Wojciech Ogieglo, Jun Yin, Luis Gutierrez-Arzaluz, Xinyuan Zhang, Jian-Xin Wang, Ingo Pinnau, Osman M. Bakr, Omar F. Mohammed
Summary: This study reveals the significant contribution of hot phonons to the photo-induced transient bandgap renormalization in MAPbBr(3) single crystals, as evidenced by asymmetric spectral evolutions and transient reflection spectral shifts in the picosecond timescale. Moreover, it identifies a strong correlation between surface charge carrier diffusion and transient bandgap renormalization in time. These findings highlight the need to re-evaluate current theories on photo-induced bandgap renormalization and provide a new approach for precisely controlling the optical and electronic properties of perovskite materials, enabling the design and fabrication of high-performance optoelectronic devices with exceptional efficiency and unique properties.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Prakash T. Parvatkar, Sharath Kandambeth, Aslam C. Shaikh, Issatay Nadinov, Jun Yin, Vinayak S. Kale, George Healing, Abdul-Hamid Emwas, Osama Shekhah, Husam N. Alshareef, Omar F. Mohammed, Mohamed Eddaoudi
Summary: Heterogeneous photocatalysis has become a popular and sustainable approach for addressing energy and environmental issues. Covalent organic frameworks (COFs) have recently gained attention as promising heterogeneous photocatalysts, offering an alternative to precious metal/organic dye-based homogeneous photocatalysts due to their excellent performance and recyclability.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Wasim J. Mir, Tariq Sheikh, Saidkhodzha Nematulloev, Partha Maity, Khursand E. Yorov, Abdul-Hamid Emwas, Mohamed Nejib Hedhili, Mudeha Shafat Khan, Mutalifu Abulikemu, Omar F. Mohammed, Osman M. Bakr
Summary: This study reports a method for synthesizing high-quality and size-tunable InSb CQDs using commercially available precursors and under standard colloidal synthesis conditions. By changing the surface ligands of the CQDs, an increase in excited-state lifetime, efficient carrier multiplication, and slower carrier annihilation are observed. This work overcomes a major challenge in synthesizing high-quality InSb CQDs and opens up new possibilities for Pb- and Hg-free CQDs in SWIR applications.
Article
Chemistry, Multidisciplinary
Amal Hani, Rana R. Haikal, Worood A. El-Mehalmey, Youssef Safwat, Mohamed H. Alkordi
Summary: In this study, a novel approach for preparing porous polycaprolactone (PCL) membranes was described, and a mixed-matrix membrane (MMM) was constructed using an amine-functionalized metal-organic framework as the sorbent filler nanoparticles and PCL as the polymer support matrix (MOF@PCL) for wastewater treatment. The MMM exhibited homogeneous morphology and excellent performance towards the removal of organic dyes, as well as good mechanical stability and recyclability.
Article
Chemistry, Multidisciplinary
Tariq Sheikh, Wasim J. Mir, Saidkhodzha Nematulloev, Partha Maity, Khursand E. Yorov, Mohamed Nejib Hedhili, Abdul-Hamid Emwas, Mudeha Shafat Khan, Mutalifu Abulikemu, Omar F. Mohammed, Osman M. Bakr
Summary: InAs colloidal quantum dots (CQDs) have emerged as candidate lead- and mercury-free solution-processed semiconductors for infrared technology due to their appropriate bulk bandgap and promising charge-carrier transport properties. However, the lack of suitable arsenic precursors and readily accessible synthesis conditions have limited their size and bandgap range. By controlling the reactivity, we have successfully synthesized monodisperse InAs nanorod CQDs with tunable bandgaps.
Article
Engineering, Chemical
Nawader Alqadhi, Mohamed H. Abdellah, Sarvarkhodzha Nematulloev, Omar F. Mohammed, Mahmoud A. Abdulhamid, Gyorgy Szekely
Summary: Polymer engineering can improve the properties and performance of membranes. In this study, two customized PEEKs were synthesized and green membrane preparation methods were used. The effects of polymer structure, green solvent, and crosslinking on membrane performance were investigated, as well as the molecular interaction between organic solvents and PEEKs. The membranes showed high permeance and long-term stability in acetone, making them suitable for active pharmaceutical ingredient purification.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
