Article
Chemistry, Physical
Seongwook Park, Seunghwan Byun, Huijeoung Ryu, Hyungwoo Hahm, Junseong Lee, Sukwon Hong
Summary: Novel ruthenium catalysts bearing azobenzene groups were developed for olefin metathesis reactions, demonstrating an on-off switching ability in ring-closing metathesis reactions depending on UV irradiation. Various types of olefin metathesis reactions, such as ring-opening metathesis, cross-metathesis, and ethenolysis, exhibited photoswitching phenomena. The reversible feature of photoswitching was confirmed by observing the photoisomerization of azobenzene-bearing cyclic(alkyl)(amino)carbene ligands and the corresponding ruthenium catalysts using UV-vis spectroscopy.
Article
Engineering, Chemical
Qu Zhang, Chao Xue, Gary Owens, Zuliang Chen
Summary: Green tea extract was used to synthesize reduced graphene oxide (rGO) as a carrier to immobilize Ochrobactrum sp. FJ1, forming a functional bionanomaterial (FJ1@rGO) for the degradation of 17beta-estradiol (E2). Response surface methodology (CCD) was used to optimize the synthesis conditions, and the optimized FJ1@rGO showed a significantly higher removal efficiency of 93.7% for E2 within 10 days. Advanced characterization confirmed the successful immobilization of FJ1 on rGO, and FJ1@rGO exhibited excellent removal effects on E1, BPA, and triclosan, as well as excellent recycling properties.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Karan Chaudhary, Krishan Kumar, Pannuru Venkatesu, Dhanraj T. Masram
Summary: This review emphasizes on protein immobilization using GO/RGO as solid support materials, highlighting the interactions between proteins and GO/RGO that influence the structural stability and activity of enzymes/proteins, as well as the wide applications of GO/RGO-protein complexes in biosensing and pharmaceutical fields.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
M. Pinzon, O. Aviles-Garcia, P. Sanchez, A. Romero, A. R. de la Osa, A. de Lucas-Consuegra
Summary: Novel ruthenium catalysts supported on reduced graphene oxide were synthesized and characterized for COx-free hydrogen generation via catalytic ammonia decomposition. The catalyst's properties were influenced by the metal loading and pre-reducing agent, with the optimal conditions resulting in a high ammonia conversion rate and hydrogen production rate.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2022)
Article
Chemistry, Physical
Leonildo A. Ferreira, Josiane T. Silva, Raissa G. Alves, Kelley C. B. Oliveira, Eduardo N. dos Santos
Summary: In this study, the cross metathesis of estragole and methyl sorbate was investigated to produce methyl 6-(4-methoxyphenyl)hexa-2,4-dienoate with good conversion and selectivity using ruthenium-based metathesis catalysts at low catalyst loadings as 50 ppm (0.005 mol%) and minimal solvent. This demonstrates the importance of catalyst selection and reaction conditions in achieving the desired product conversion and selectivity.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Applied
Yanwei Liu, Hongbiao Du, Yanghao Meng, Shuai Lu, Jinglai Zhang, Huansheng Wang
Summary: In this study, reduced graphene oxide (RGO) loaded with nickel was used for the first time as a catalyst in the hydrothermal liquefaction (HTL) of microalgae. The RGO catalyst improved the yield and quality of bio-oil by promoting the formation of hydrocarbons, reducing the oxygen content, and increasing the content of low boiling point components.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Applied
Bin Gu, Qimeng Jiang, Bichong Luo, Chuanfu Liu, Junli Ren, Xiaohui Wang, Xiaoying Wang
Summary: A new nanocomposite film was synthesized in this study, showing durable antibacterial effect against E. coli and S. aureus and no toxicity to cells.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Multidisciplinary
Gil-Ryeong Park, Seung Geun Jo, Anuraj Varyambath, Jeonghyun Kim, Jung Woo Lee
Summary: Nitrogen-doped reduced graphene oxide with Pd4.7Ru nanoparticles showed efficient catalytic activity in oxygen reduction reaction, with pyridinic nitrogen atoms acting as anchoring sites for particle bonding. The optimal composition of Pd and Ru at 4.7:1 ratio exhibited high durability and excellent ORR activity, making it a potential candidate for fuel cell applications.
Article
Nanoscience & Nanotechnology
K. D. R. N. Kalubowila, M. Siyath Gunewardene, J. Lakmini Kaushalya Jayasingha, Dhammike Dissanayake, Charith Jayathilaka, J. M. Dilushan Jayasundara, Yun Gao, J. K. D. Sumedha Jayanetti
Summary: A highly efficient Cu2O/Cu/rGO composite photocatalyst was synthesized through a series of steps, showing significantly improved degradation of methylene blue in solution compared to using Cu2O alone, with minimal effects of photocorrosion. The layered graphene oxide provides an effective medium for photoelectron transportation to the reactant while inhibiting photocorrosion, and also demonstrated the ability to split water under visible light in the presence of methanol.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yiqi Liu, Jiaqi Li, Anusheela Das, Hacksung Kim, Leighton O. Jones, Qing Ma, Michael J. Bedzyk, George C. Schatz, Yosi Kratish, Tobin J. Marks
Summary: The study demonstrates the importance of molecularly derived single-site heterogeneous catalysts in bridging the understanding and performance gaps between conventional homogeneous and heterogeneous catalysis. The characterization of single-site Mo(=O)(2) species grafted onto reduced graphene oxide (rGO/MoO2) provides valuable insights into the structural properties and catalytic performance of the catalyst.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Energy & Fuels
Mujahed Al-Dhaifallah, Mohammad Ali Abdelkareem, Hegazy Rezk, Hesham Alhumade, Ahmed M. Nassef, Abdul Ghani Olabi
Summary: The study showed that there is an optimal ratio between TiN and Co to maximize the ORR activity. CoTiN (30)/Gr exhibited an onset potential of 0.926 V vs Ag/AgCl, much higher than commercial Pt/C catalyst. The prepared catalyst has no activity towards methanol oxidation, making it a promising cathode catalyst for direct alcoholic FCs.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Abdulwahab Salah, Hong-Da Ren, Nabilah Al-Ansi, Huaqiao Tan, Feiyang Yu, Liu Yanchun, Badr M. Thamer, Adel Al-Salihy, Liang Zhao, Yangguang Li
Summary: Researchers have developed a new strategy to enhance the catalytic activity of ruthenium (Ru) electrocatalysts for hydrogen production by modifying hexagonal boron nitride (h-BN) with reduced graphene oxide (rGO), resulting in the dispersion of Ru nanoparticles with uniform distribution and size control. The Ru/BN composite exhibits excellent hydrogen evolution reaction (HER) activity in both acidic and alkaline conditions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Wioletta Kosnik, Dawid Lichosyt, Marcin Sniezek, Angelika Janaszkiewicz, Krzysztof Wozniak, Maura Malinska, Bartosz Trzaskowski, Anna Kajetanowicz, Karol Grela
Summary: The formation of sterically hindered C-C double bonds through catalytic olefin metathesis is a challenging task for Ru catalysts. To overcome this limitation, a new NHC ligand was designed, which reduced the susceptibility of small-size NHC catalysts to decomposition. The resulting isomeric complexes exhibited similar high thermodynamic stability but different application profiles in catalysis.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Navneet Kumar, Vimal Chandra Srivastava
Summary: The G/La heterogeneous catalyst showed excellent performance in the dimethyl carbonate synthesis due to its high surface area and the presence of acidic and basic active sites. However, recyclability and reusability experiments demonstrated a gradual decrease in catalyst activity.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Agricultural Engineering
Fernando Roberto Paz-Cedeno, Jose Miguel Carceller, Sara Iborra, Ricardo Keitel Donato, Anselmo Fortunato Ruiz Rodriguez, Marco Antonio Morales, Eddyn Gabriel Solorzano-Chavez, Ismael Ulises Miranda Roldan, Ariela Veloso de Paula, Fernando Masarin
Summary: Immobilized enzymes on magnetic graphene oxide particles improve stability and reusability, showing potential applications in enzymatic hydrolysis of sugarcane bagasse.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Chemistry, Organic
Lucile Marin, Guillaume Force, Vincent Gandon, Emmanuelle Schulz, David Leboeuf
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Chemistry, Physical
Axel Labattut, Ibrahim Abdellah, Julien Buendia, Sandra Abi Fayssal, Erika Adhel, Diana Dragoe, Cyril Martini, Emmanuelle Schulz, Vincent Huc
Article
Chemistry, Multidisciplinary
Emmanuelle Schulz
Summary: Chiral cobalt-salen complexes have been essential for many asymmetric catalytic reactions due to their extraordinary reactivity and mode of action, as well as the processes towards optimizing their cooperativity for bimetallic activation and effective immobilization. The inspiring works dedicated to the discovery of their new reactivity continue to contribute to the field.
Article
Materials Science, Multidisciplinary
Rita Zakhia Douaihy, Igor Telegeiev, Hussein Nasrallah, Oleg Lebedev, Philippe Bazin, Alexandre Vimont, Jean-Francois Chailan, Armand Fahs, Mohamad EL-Roz
Summary: In this study, a new bifunctional silane-based type-1 photoinitiator was utilized as a coupling agent for photopolymer filler and silica grafting. The grafted particles showed enhanced mechanical properties compared to unmodified silica, and the dispersion of the filler in the polymer matrix was analyzed at the microscale level using various characterization techniques. This research provides valuable insights into the development of materials with improved mechanical properties and dispersion effects.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Mariam Abd El Sater, Mohamed Mellah, Diana Dragoe, Emilie Kolodziej, Nada Jaber, Emmanuelle Schulz
Summary: This study reports the first immobilization of a pyrene-tagged chromium salen complex on reduced graphene oxide (rGO) through pi-pi noncovalent interactions, creating a robust catalytic system for asymmetric catalysis. The chiral chromium salen@rGO catalyst was found to maintain high activity and enantioselectivity in repeated cycles, demonstrating compatibility with multi-substrate use.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Houssein Nasrallah, Pengbo Lyu, Guillaume Maurin, Mohamad El-Roz
Summary: The RuPy···ReCOPy supramolecular assembly demonstrated high performance in the photocatalytic conversion of CO2 into CO, with a significantly higher turnover frequency and CO quantum yield compared to the benchmark system Ru(bpy)3Cl2 and Re(bpy)(CO)3Cl. Time resolved spectroscopy and Density Functional Theory calculations revealed an electron transfer mechanism contributing to the superior photocatalytic performance of RuPy···ReCOPy.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Applied
Sandra Abi Fayssal, Timothee Naret, Julien Buendia, Axel Labattut, Vincent Huc, Cyril Martini, Emmanuelle Schulz
Summary: This study presented a rapid and scalable synthesis method for supported NHC-Pd(II)-pyridine complexes on a benzyloxycalix[8]arene macrocycle, which were subsequently used in Suzuki-Miyaura benchmark reactions to optimise ligand nature and deliver highly active precatalysts. The insoluble species showed comparable or superior activity to conventional homogeneous catalysts, with the additional benefit of simple filtration post-reaction for low Pd contamination values in target products.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Review
Chemistry, Multidisciplinary
Yu-Chao Yuan, Mohamed Mellah, Emmanuelle Schulz, Olivier R. P. David
Summary: In this article, the applications of bisimine derivatives of salicylaldehyde with chiral diamines (salens) in asymmetric organometallic catalysis are reviewed and classified according to the organocatalyst. The mechanisms and physical-organic chemistry considerations of these complex catalytic systems are discussed for a better understanding.
Article
Polymer Science
Houssein Nasrallah, Rita Zakhia Douaihy, Igor Telegeiev, Oleg I. Lebedev, Armand Fahs, Mohamad EL-Roz
Summary: Bifunctional coupling agents play a crucial role in preparing hybrid materials, but their application in photo-curable matrices is limited. This study synthesizes and tests new bifunctional coupling agent structures under different irradiation conditions, expanding their application range and demonstrating their high efficiency in preparing filler-polymer hybrid materials, especially under visible-light irradiation.
Article
Biochemistry & Molecular Biology
Erigene Bakangura, Philippe Roger, Rafaela S. B. Soares, Mohamed Mellah, Nadine Barroca-Aubry, Anne-Chantal Gouget-Laemmel, Francois Ozanam, Ludovic Costa, Jean-Pierre Baltaze, Emmanuelle Schulz
Summary: This study reports the use of copolymers as valuable supports for heterogeneous catalysts in the field of asymmetric catalysis. The synthesized copolymers showed excellent activity and selectivity in the asymmetric ring opening of cyclohexene oxide and could be recovered and reused multiple times through simple filtration.
Editorial Material
Chemistry, Organic
Matthieu Sollogoub, Emmanuelle Schulz
Summary: The Division de Chimie Organique (DCO) of the Societe Chimique de France (SCF) and the European Journal of Organic Chemistry are collaborating for the second year in a row to honor the recipients of the 2021 DCO Awards.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Sandra Abi Fayssal, Timothee Naret, Vincent Huc, Julien Buendia, Cyril Martini, Emmanuelle Schulz
Summary: The scalable synthesis of Pd-NHC cinnamyl complexes supported on benzyloxycalix[8]arene is reported. These catalysts are highly active for Buchwald-Hartwig cross-coupling reactions, enabling the coupling of aryl chlorides and bromides with alkyl and aryl amines at low catalytic loadings. The supported complexes also produce attractive unsymmetrical triarylamines and can even facilitate the synthesis of unprecedented Pd-catalyzed C-H activation products. Through an easy to implement procedure, these characterized catalysts combine the best features of homogeneous and heterogeneous catalysis, achieving high efficiency and low Pd leaching levels.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Organic
Yu-Chao Yuan, Mariam Abd El Sater, Mohamed Mellah, Nada Jaber, Olivier R. P. David, Emmanuelle Schulz
Summary: New procedures for efficient reuse of chiral organic catalysts are in high demand, with the synthesis of a chiral isothiourea functionalized by a pyrene moiety via click chemistry being described in this study. The immobilization of the catalyst on reduced graphene oxide through strong pi-pi interactions led to successful reuse in seven consecutive cycles, demonstrating high yields and good to excellent enantioselectivity values in the targeted product synthesis.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Houssein O. Nasrallah, Yuanyuan Min, Emmanuel Lerayer, Tuan-Anh Nguyen, Didier Poinsot, Julien Roger, Stephane Brandes, Olivier Heintz, Pierre Roblin, Franck Jolibois, Romuald Poteau, Yannick Coppel, Myrtil L. Kahn, Iann C. Gerber, M. Rosa Axet, Philippe Serp, Jean-Cyrille Hierso
Summary: Ultrasmall gold nanoparticles stabilized in networks by polymantane ligands were successfully utilized as highly selective heterogeneous gold precatalysts, providing control over selectivity and enabling a one-pot cascade reaction approach. The ability to assemble nanoparticles with controllable sizes and shapes within networks holds significant implications for various applications, while the synthesis of sub-2-nm gold NPs in dense networks using ditopic polymantanethiols was achieved.
Review
Chemistry, Multidisciplinary
Hiba Dandachi, Xiang Hong, Farah Ibrahim, Houssein Nasrallah, Anais Zulauf, Nada Jaber, Mohamed Mellah, Emmanuelle Schulz
VIETNAM JOURNAL OF CHEMISTRY
(2020)