Article
Biochemistry & Molecular Biology
Domna Iordanidou, Michael G. Kallitsakis, Marina A. Tzani, Dimitris I. Ioannou, Tryfon Zarganes-Tzitzikas, Constantinos G. Neochoritis, Alexander Domling, Michael A. Terzidis, Ioannis N. Lykakis
Summary: This study reported the synthesis of 3,4-dihydroquinoxalin-2-ones through the selective reduction reaction catalyzed by supported gold nanoparticles. The reaction proceeded through heterogeneous transfer hydrogenation and intramolecular C-N transamidation, resulting in good functional-group tolerance and high yields.
Article
Chemistry, Inorganic & Nuclear
Sonia R. Leandro, Ines J. Marques, Ruben S. Torres, Tiago A. Fernandes, Pedro D. Vaz, Carla D. Nunes
Summary: A 2:1 Co/Al layered double hydroxide material was synthesized with Au nanoparticles immobilized for catalytic performance in the reduction of nitroaromatic compounds and rhodamine dyes. While the Au-containing catalyst showed the best activity, the LDH with Cl- closely followed in performance and exhibited higher stability in the presence of amine products. These results suggest the potential of first-row metal-based catalysts in addressing environmental concerns and achieving efficient processes.
INORGANICA CHIMICA ACTA
(2021)
Article
Chemistry, Physical
Xing Shen, Kairui Liu
Summary: In recent years, single-atom catalysts (SACs) have been successfully synthesized through various methods, demonstrating excellent catalytic activities. However, the tendency of metal atoms to agglomerate in liquid media complicates the synthesis of SACs in such environments. The synthesis of metal single-atom catalysts without strong ligand coordination is rarely reported. This study presents a straightforward synthesis of monodispersed Au atoms (Au-1) by reducing HAuCl4 in the presence of 15-crown-5. The resulting Au-1@15-crown-5 catalyst exhibits high catalytic activity in the reduction of nitrophenol and nitroaniline, outperforming both noble nanoparticles and non-precious metal catalysts due to the monodispersion of Au atoms.
Article
Chemistry, Multidisciplinary
Wenyan Li, Xinying Lin, Jing Long, Bo Zheng, Zhaorui Pan, Leiming Lang, Guangxiang Liu
Summary: The mesoporous core-shell structure Ag@SiO2 nanospheres are constructed to prevent aggregation of Ag nanoparticles during hydrogenation, leading to superior catalytic performance in terms of 100% conversion and selectivity in the hydrogenation of nitro compounds, with good recycling performance for multiple uses.
Article
Chemistry, Multidisciplinary
V. Rajagopal, M. Ragunath, Niyaz Ahamed Khan, M. Kathiresan, V. Suryanarayanan, L. A. Jones, S. Kundu
Summary: Herein, a covalent organic polymer network based on 1,4-phenylenediamine (PD-COP) was synthesized and decorated with gold nanoparticles (Au NPs). The resulting Au@PD-COP-II catalyst exhibited excellent electrocatalytic activity for total water splitting and nitro compound reduction reactions. The catalyst showed low overpotential, high current density, and good stability, making it a promising candidate for efficient water electrolysis and catalytic reduction reactions.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Bingxin You, Yuyang Tian, Baolin Wang, Guangshan Zhu
Summary: A strategy has been developed to prepare gold nanoparticles supported by porous aromatic frameworks with high loading, stability, and activity. This approach involves ion exchange and reduction steps, resulting in significantly increased loading and excellent catalytic performance.
Article
Chemistry, Physical
Davide Pavesi, Federico Dattila, Rim C. J. Van de Poll, Dimitra Anastasiadou, Rodrigo Garcia-Muelas, Marta Figueiredo, Gert-Jan M. Gruter, Nuria Lopez, Marc T. M. Koper, Klaas Jan P. Schouten
Summary: This study shows that by introducing indium into palladium-rich bimetallic particles, the selectivity and surface poisoning of CO2 electroreduction catalysts can be controlled. The research reveals the dependence of CO2 reduction selectivity on the composition of Pd-In nanoparticles, providing insight into developing cheap, selective, and poison-resistant catalysts for electrochemical applications.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Qiaoya Zhu, Wenjing Zhang, Jun Cai, Jin Li, Lian Zhong, Shuai Pu, Aifeng Li
Summary: Gold nanoparticles were synthesized using chitosan as a reducing agent and stabilizer, and their catalytic activity in the reduction of nitrophenol was investigated. The results showed that the morphology of the nanoparticles could be controlled by adjusting the concentration, molecular weight, and deacetylation degree of chitosan. The catalytic activity of the nanoparticles was found to be dependent on their morphology and the nature of the reducing agent and stabilizer.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Inorganic & Nuclear
Cao-Hien Nguyen, Kien-Sam Banh, Van-Dung Le, Minh-Ty Nguyen, Chi - Hien Dang, Tran Vinh Thien, Van-Dat Doan, DongQuy Hoang, Tran Thi Kim Chi, Thanh-Danh Nguyen
Summary: In this study, gold nanoparticles (AuNPs) catalyst was fabricated using beta-cyclodextrin as a reducing and stabilizing agent under ultrasound irradiation. The synthesized AuNPs showed a stable colloidal solution with crystalline structure. The kinetic data indicated that the performance of 2-nitrophenol reduction was better than that of 4-nitrophenol.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Van-Dat Doan, Quoc-Huy Pham, Bao-An Huynh, Thi-Lan-Huong Nguyen, Anh-Tien Nguyen, Thanh-Danh Nguyen
Summary: In this study, gold nanoparticles (AuNPs) synthesized using an aqueous extract of Cynomorium songaricum (CS) were used as catalysts for the reduction of nitrophenols at various reaction temperatures. The biosynthesized CS-AuNPs showed good stability and low activation energy, and were capable of detecting hydrogen peroxide with a low detection limit of 2.25 µM. It was found that the reduction of nitrophenols followed a Langmuir-Hinshelwood mechanism with a half-order kinetic model, with activation energies as low as 4.88 kJ mol(-1) and 8.66 kJ mol(-1) for different nitrophenols.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Kayee Chan, Anatoly Zinchenko
Summary: This study utilized discarded plastic to prepare a hydrogel-based catalyst through a cross-linking reaction and electroless metallization. The resulting hybrid hydrogels contained well-dispersed gold and silver nanoparticles, which exhibited catalytic activity for the reduction of p-nitrophenol and could be reused multiple times. This approach broadens the conversion routes of plastic waste and develops new types of polymeric matrices for templating and growth of metal nanoparticles.
Article
Materials Science, Multidisciplinary
Fuad Othman Abdullah, Leila Behrouzi, Babak Kaboudin
Summary: This study developed a method for synthesizing highly stable PdNPs on AO extract, demonstrating its efficient catalytic activity in the reduction of nitroaromatic compounds. Characterization of the catalyst and investigation of product yields confirmed its practicality and high efficiency in the reaction.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Multidisciplinary
Olivier Gazil, Nick Virgilio, Fabienne Gauffre
Summary: In this study, a novel method for synthesizing metal nanoparticle-shells and continuous shells at the liquid/liquid interface using the Ouzo emulsion system is reported. Control over the size of the nanoparticle-shells was achieved by the addition of a water-soluble polymer during synthesis.
Article
Engineering, Environmental
Maciej Fronczak, Artur Kasprzak, Michal Bystrzejewski
Summary: The novel magnetic catalyst composed of palladium nanoparticles supported on surface-oxidized carbon-encapsulated iron nanoparticles exhibits excellent catalytic activity in hydrogenation reactions, with yields above 90% and consistent performance after multiple cycles. Compared to traditional methods, this approach is safer as it does not require the use of dangerous gaseous hydrogen.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Inorganic & Nuclear
Changlong Wang, Agathe Brudo, Laurine Ducrot, Fangyu Fu, Jaime Ruiz, Ane Escobar, Angel Martinez-Villacorta, Sergio Moya, Didier Astruc
Summary: The study explores the effects of water-soluble ferrocene derivatives on gold nanoparticles, showing that under appropriate conditions, catalytically active gold nanocrystals can be produced.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Vusala A. Aliyeva, Atash V. Gurbanov, Abdallah G. Mahmoud, Rosa M. Gomila, Antonio Frontera, Kamran T. Mahmudov, Armando J. L. Pombeiro
Summary: The chalcogen bond (ChB) is a noncovalent attraction between an electrophilic chalcogen atom and a nucleophilic region. It is similar to hydrogen and halogen bonds in terms of strengths and directionality. However, chalcogen atoms can have multiple electrophilic centers, which provides more opportunities for use in synthetic operations.
FARADAY DISCUSSIONS
(2023)
Article
Biochemistry & Molecular Biology
Anirban Karmakar, Anup Paul, Maria Fatima C. da Silva, Armando J. L. Pombeiro
Summary: Two new 1D Cd(II) coordination polymers were synthesized and used as catalysts for the solvent-free Strecker-type cyanation reaction of different acetals. One of the catalysts showed higher activity, and both catalysts were found to be recyclable.
Article
Biochemistry & Molecular Biology
Ana Sofia Figueiredo, Ana Maria Ferraria, Ana Maria Botelho do Rego, Silvia Monteiro, Ricardo Santos, Miguel Minhalma, Maria Guadalupe Sanchez-Loredo, Rosa Lina Tovar-Tovar, Maria Norberta de Pinho
Summary: The antibacterial properties of cellulose acetate/silver nanoparticles (AgNP) ultrafiltration membranes were studied and the results showed that the distinct features of each side of the membranes, the active and porous layers surfaces, played a role in the antibacterial activity. The composition and structure of the membranes affected the accessibility of the silver to Escherichia coli (E. coli), leading to different levels of growth inhibition. The findings suggest that the membrane design and silver distribution can be optimized to enhance the antibacterial performance.
Article
Biochemistry & Molecular Biology
Rita F. Nunes, Daniel Costa, Ana M. Ferraria, Ana Botelho M. do Rego, Filipa Ribeiro, Angela Martins, Auguste Fernandes
Summary: Due to the need to reduce global CO2 emissions, bio-based fuels are being explored. To reduce oxygen content, bio-oils need to be upgraded through catalytic hydrodeoxygenation (HDO) using bifunctional catalysts with metal and acid sites. Pt-Al2O3 and Ni-Al2O3 catalysts containing heteropolyacids (HPA) were prepared, and their properties were characterized. Ni-based catalysts showed higher conversion and selectivity to deoxygenated compounds, making them the most promising, despite suffering from deactivation over time.
Review
Engineering, Chemical
Brij Mohan, Anshul Kamboj, Virender, Kamal Singh, Priyanka, Gurjaspreet Singh, Armando J. L. Pombeiro, Peng Ren
Summary: Environmental safety is a global concern, and the contamination of water and food poses various problems. Therefore, the removal of toxicants from environmental samples is crucial for public health safety. Metal-organic frameworks (MOFs) are promising materials that combine metal ions with organic ligands and possess unique physical and chemical properties for removing toxicants.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Multidisciplinary Sciences
Ana Maria Faisca Phillips, Armando J. L. Pombeiro
Summary: Atropisomers, which are stereoisomers hindered in their rotation due to steric interactions or electrostatics, exhibit unique characteristics and can be found in various applications. The synthesis of atropisomers containing C-N and N-N axes of chirality has become a hot topic in research, focusing on sustainable synthesis using achiral materials and organocatalysts under mild conditions. This review provides an overview of recent achievements in this field.
Review
Chemistry, Physical
Ana Maria Faisca Phillips, Armando J. L. Pombeiro
Summary: Hantzsch esters have emerged as versatile reagents for enantioselective organic transformations in the last century. They can selectively reduce various multiple bonds, such as C=C and C=N, as hydride transfer agents under mild reaction conditions. Additionally, they are effective for the dearomatization of heteroaromatic substances and can participate in cascade processes. In recent years, they have also been employed in photoredox reactions, acting as sacrificial electron and hydrogen donors, as well as alkyl or acyl radical transfer agents.
Article
Chemistry, Applied
Anup Paul, Rais Ahmad Khan, Gouse M. Shaik, Jilani P. Shaik, Avdhesh K. Rai, M. Fatima C. Guedes da Silva, Armando J. L. Pombeiro
Summary: Two new anthracene Schiff base triorganotin (IV) compounds, trimethylstannyl(E)-4-((anthracen-9-ylmethylene)amino)benzoate (1) and triphenylstannyl(E)-4-((anthracen-9-ylmethylene)amino)benzoate (2), were synthesized and characterized. Both compounds exhibited significant in vitro cytotoxicity against lung carcinoma and leukemia cancer cell lines. Compound 2 showed a higher binding affinity to NF-κB p65 and Hsp90 proteins, supporting the experimental findings.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Abdallah G. Mahmoud, Ivy L. Librando, Anup Paul, Sonia A. C. Carabineiro, Ana Maria Ferraria, Ana Maria Botelho do Rego, M. Fatima C. Guedes da Silva, Carlos F. G. C. Geraldes, Armando J. L. Pombeiro
Summary: New organotin compounds with a PTA derivative as ligand were synthesized and characterized. These compounds were heterogenized on activated carbon and carbon nanotubes, and their catalytic properties were investigated. Complex 3 supported on activated carbon showed high activity and recyclability for the cyanosilylation reaction of aromatic and aliphatic aldehydes. NMR analysis suggested a double activation mechanism.
Article
Biochemistry & Molecular Biology
Nenad Bundaleski, Carolina F. Adame, Eduardo Alves, Nuno P. Barradas, Maria F. Cerqueira, Jonas Deuermeier, Yorick Delaup, Ana M. Ferraria, Isabel M. M. Ferreira, Holger Neupert, Marcel Himmerlich, Ana Maria M. B. do Rego, Martino Rimoldi, Orlando M. N. D. Teodoro, Mikhail Vasilevskiy, Pedro Costa Pinto
Summary: There has been growing interest in using amorphous carbon thin films with low secondary electron yield (SEY) to reduce electron multipacting in particle accelerators and RF devices. Previous studies have shown that the SEY increases with the amount of hydrogen and is correlated with the Tauc gap. In this study, films produced by magnetron sputtering with varying amounts of hydrogen and deuterium were analyzed, and it was found that the maximal SEY decreases with the fraction of the graphitic phase in the films.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Ana Maria Faisca Phillips, Armando J. L. Pombeiro
Summary: Nitrogen-containing heterocycles, such as morpholin-2-ones, are important structural elements in biologically active substances and can serve as synthetic intermediates. A new method for regioselective cross-dehydrogenative coupling between morpholinones and cyclic imides was developed using copper(I) chloride as a metal catalyst and molecular oxygen as the oxidant. The C-N coupled products were obtained in high yields under mild conditions, and they have potential applications in the development of biologically active compounds as well as functionalized polymers or PROTACs.
Article
Chemistry, Multidisciplinary
Ismayil M. Garazade, Atash V. Gurbanov, Rosa M. Gomila, Antonio Frontera, Ana V. M. Nunes, Kamran T. Mahmudov, Armando J. L. Pombeiro
Summary: The study investigates the role of noncovalent interactions (spodium, halogen and hydrogen bonds) in the reaction of [Zn{NH=C(CCl3)NC(CCl3)=NH}(2)] with acetone, pyrazole, 4,4'-bipyridine and Cu(acetylacetonate)2. Different types of organic, coordination, and supramolecular compounds were obtained depending on the reactants, revealing various types of noncovalent interactions.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ibadulla Mahmudov, Atash V. Gurbanov, Luisa M. D. R. S. Martins, Yusif Abdullayev, Afsun Sujayev, Kamran T. Mahmudov, Armando J. L. Pombeiro
Summary: A series of coordination compounds were synthesized by reacting (E)-1(amino(1H-pyrazol-1-yl)methylene)guanidinium chloride with different metal compounds in methanol. These compounds were fully characterized and showed good catalytic activity in the peroxidative oxidation of styrene.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Maxim L. Kuznetsov, Armando J. L. Pombeiro
Summary: In contrast to V(v) complexes with various organic ligands, a simple vanadate without any additive is inactive in neutral medium toward the oxidation of alkanes with H2O2. In this work, we discovered that the insufficient activation of H2O2 upon coordination to the simple vanadate - the commonly accepted reason for the low catalytic activity of the vanadate - cannot explain this phenomenon.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Atash V. V. Gurbanov, Abdallah G. G. Mahmoud, Vusala A. Aliyeva, M. Fatima C. Guedes Guedes da Silva, Armando J. L. Pombeiro
Summary: The reaction of 2-(2-(dicyanomethylene)hydrazineyl)benzoic acid (H2L1) with copper(II) acetate in the absence or presence of imidazole (im), 4,40-bipyridine (4,4'-bipy) or pyridine (py) leads to the formation of new complexes. The trinuclear Cu(II) complex [Cu(py)2{Cu(py)(m-L-2a)}2] (5) is obtained through a one-pot activation of nitrile groups. The catalytic activity of the complexes in the 1,3-dipolar azide-alkyne cycloaddition reaction was investigated.
NEW JOURNAL OF CHEMISTRY
(2023)
