Article
Green & Sustainable Science & Technology
L. M. S. Garcia, N. G. P. Filho, K. Chair, P. Kaur, A. S. Ramos, P. J. Zambiazi, R. F. B. De Souza, L. Otubo, A. Duong, A. O. Neto
Summary: Electrocatalytic carbon dioxide reduction reaction is an effective method to convert greenhouse gases into chemical fuels, and this study utilized a copper(II) complex supported on carbon black as a catalyst to convert CO2 into methanol using a polymeric electrolytic reactor - fuel cell type. The results showed that using 2.5% and 5% Cu complex achieved high faradaic efficiency.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Chemistry, Multidisciplinary
Luis M. S. Garcia, Priscilla J. Zambiazi, Khaoula Chair, Tuan Duy Doan, Andrezza S. Ramos, Julio Nandenha, Rodrigo F. B. De Souza, Larissa Otubo, Adam Duong, Almir O. Neto
Summary: This study investigates the ideal relationship between the nanostructure of a palladium complex and carbon to obtain a stable, conductive, and functional reagent diffusion electrode for the partial oxidation of methane to methanol. The results suggest that a 20% mass concentration of the palladium complex supported on carbon is the most active, exhibiting lower open-circuit and power density but higher efficiency in methanol production.
Article
Chemistry, Inorganic & Nuclear
Yuyuan Xiao, Rong Sun, Jiefeng Liang, Yuhui Fang, Zheng Liu, Shangda Jiang, Bingwu Wang, Song Gao, Wenliang Huang
Summary: The synthesized rare earth metal complexes exhibit complex electronic structures and magnetic behaviors. The structural and magnetic data are consistent with density functional theory calculations, revealing the antiferromagnetic coupling between the radical anions.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Daniel A. W. Ross, Joseph Mapley, Andrew P. Cording, Roan A. S. Vasdev, C. John McAdam, Keith C. Gordon, James D. Crowley
Summary: A bulky 6,6'-diTPAbpy ligand was synthesized and used to form homoleptic complexes with Cu(I) and Ag(I) ions, as well as interact with 6-coordinate metal ions. The steric bulk of the ligand affected the coordination geometry and photophysical properties of the complexes, showing changes in absorption and emission properties.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Somaye Karimian, Mohsen Shekouhy, Somayeh Pirhadi, Aida Iraji, Mahshid Attarroshan, Najmeh Edraki, Mehdi Khoshneviszadeh
Summary: In this study, a series of benzimidazole/1,3,5-triazine-2,4-diamine hybrid derivatives were designed and synthesized for the treatment of Alzheimer's disease. The compounds showed inhibitory activity against AChE, BuChE, and BACE1, and interacted with the active sites of AChE and BuChE. In silico analysis of the compounds' ADMET profiles indicated drug-like properties.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Khaoula Chair, Cesar Augusto Luna Caceres, Sanil Rajak, Olivier Schott, Gustavo E. Ramirez-Caballero, Thierry Maris, Garry S. Hanan, Adam Duong
Summary: Carbon dioxide is an important trace gas in the atmosphere and its high concentration leads to serious issues. The use of solar energy for the photochemical reduction of CO2 is a promising strategy, but it faces challenges that need to be addressed for it to become a sustainable alternative for fuel and chemical generation. In this study, molecular photocatalysts were designed and demonstrated remarkable photocatalytic properties for CO2 reduction to CO. The mechanistic pathways of the reaction were investigated using a combination of structural characterization, experimental data, and density functional theory calculations.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Adela Abidi, Emmanuelle Fortin, Kariane Larocque, Mohamed Essalhi, Nour Dissem, Daniel Chartrand, Thierry Maris, Adam Duong
Summary: In this paper, a facile method was reported for synthesizing eight structurally diverse compounds 1-8 with a hydrogen bonding functional group - diaminotriazine (DAT) along with pyridine and polyether groups for 1-4 and DAT linked via C-C bond to a 2-pyridone for 5-8. The successful synthesis of 1-8 was confirmed by various analytical techniques. The molecular structures and aggregations in the solid state of these compounds were elucidated using single crystal X-ray diffraction.
Article
Chemistry, Multidisciplinary
Sang Loon Tan, Yee Seng Tan, Muhammad Syafiq Bin Shahari, Ahmad Junaid, Anton Dolzhenko, Edward R. T. Tiekink
Summary: Two polymorphs, alpha and beta, of an N-2,6-diaryl-1,3,5-triazine-2,4-diamine derivative have been isolated and show distinct molecular packing and stability of molecular conformation. The alpha-polymorph features expansive, stabilising pi stacking interactions achieved by relatively unstable conformations. The beta-polymorph is the thermodynamically stable form and can be obtained by the conversion of the alpha-polymorph over time or by heating.
Article
Chemistry, Physical
Xue-Ping Chang, Geng Zhao, Teng-Shuo Zhang, Bin-Bin Xie
Summary: This study systematically explores the excited-state properties and photophysics of cytosine aza-analogues (2,4-DT and 2-AT) in solution using the QM(MS-CASPT2//CASSCF)/MM approach. The nonradiative relaxation mechanisms for the photoexcited S-1(pi pi*) state decay back to the S-0 state are proposed based on computed minima, surface crossings, and excited-state decay paths in multiple states. The amination/deamination of the triazine rings can affect the excitation energies and nonradiative decay pathways, providing insights into the understanding of the photophysics of aza-nucleobases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Brian J. J. Timmer, Oleksandr Kravchenko, Biaobiao Zhang, Tianqi Liu, Licheng Sun
Summary: This study investigates the catalytic activity of Ru(bda)L-2 family of catalysts and finds that the unique bimolecular reactivity is purely dependent on the spatial geometry of the ligand. The electronic effects of the backbone do not significantly impact the catalysis, highlighting the importance of structural features in determining catalytic activity.
INORGANIC CHEMISTRY
(2021)
Article
Crystallography
Yue Sun, Tianyu Yang, Wenxiang Wang
Summary: The substance is C20H16N6, monoclinic crystal system, with cell parameters a = 7.6623(4) angstrom, b = 11.8206(5) angstrom, c = 8.8960(4) angstrom, β = 91.825(2) degrees, and volume V = 805.33(7) angstrom^3.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
(2022)
Review
Chemistry, Medicinal
Muhammad Syafiq Bin Shahari, Anton V. Dolzhenko
Summary: N-2,6-substituted 1,3,5-triazine-2,4-diamines (N-2-substituted guanamines) are a diverse scaffold with potential in the development of bioactive molecules. They can be used to construct compounds targeting various enzymes, receptors, transporters, and nucleic acids, with therapeutic applications in cancer, inflammation, and CNS disorders.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2022)
Article
Crystallography
Zhi-Yong Wang, Peng-Xin Qian, Xian-Jiong Yang, Qi-Long Zhang, Hong Xu, Ya-Li Huang
Summary: This compound is C8H8N6 center dot C5H9O2, monoclinic I2/alpha (no. 15) with lattice parameters a = 13.2666(17) angstrom, b = 11.0435(15) angstrom, c = 19.778(3) angstrom, beta = 92.707(10)degrees. The unit cell volume is V = 2894.4(7) angstrom(3), and it contains 8 molecules. The R-factor and weighted R-factor are R-gt(F) = 0.0528 and wR(ref)(F-2) = 0.1511, respectively.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Saleh Ali Akbari, Subhajit Nandy, Keun Hwa Chae, Rahman Bikas, Anna Kozakiewicz-Piekarz, Mohammad Mahdi Najafpour
Summary: Recently, there has been extensive research on copper(II) complexes as catalysts for the oxygen-evolution reaction. This study reports new findings on the oxygen-evolution reaction in the presence of a Cu(II) complex with a 6,6'-dihydroxy-2,2'-bipyridine ligand. Various techniques such as SEM, EDX, XRD, Raman spectroscopy, in situ visible microscopy, in situ visible spectroelectrochemistry, XAS, and electrochemistry were used to investigate the hypothesis that a film formed on the electrode's surface in the presence of this complex promotes the production of Cu(hydr)oxide, which can serve as a catalyst for OER. The formation of the film stabilizes Cu(hydr)oxide and enhances OER activity.
Article
Chemistry, Inorganic & Nuclear
Daria O. Kozina, Julia R. Shakirova, Ekaterina E. Galenko, Vitaly V. Porsev, Vladislav V. Gurzhiy, Alexander F. Khlebnikov, Sergey P. Tunik
Summary: A series of novel 6,6'-diphenyl-2,2'-bipyridine ligands modified with substituents were synthesized and used in the synthesis of pincer platinum chloride complexes. The obtained compounds reacted with triphenylphosphine in an unusual pathway to give products with two phosphine ligands. These complexes exhibited phosphorescence in solution and solid state, with their photophysical characteristics explained by DFT calculations.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Adriano de Souza Carolino, Matheus Moraes Biondo, Stefan Talu, Henrique Duarte da Fonseca Filho, Pedro Henrique Campelo, Jaqueline de Araujo Bezerra, Cicero Mota, Hidembergue Ordozgoith da Frota, Vanderlei Salvador Bagnato, Natalia Mayumi Inada, Edgar Aparecido Sanches
Summary: The development of conjugated polymer-based nanocomposites by adding metallic particles into the polymerization medium allows the proposition of novel materials presenting improved electrical and optical properties. In this study, ES-PANI-WO3 center dot 2H(2)O nanocomposites were successfully synthesized and characterized, showing increased electrical conductivity and purely physical interaction.
Article
Biochemistry & Molecular Biology
Jessica Montenegro Santana da Silva, Adriano de Souza Carolino, Lilian Rodrigues de Oliveira, Douglas de Souza Goncalves, Matheus Moraes Biondo, Pedro Henrique Campelo, Jaqueline de Araujo Bezerra, Stefan Talu, Henrique Duarte da Fonseca Filho, Hidembergue Ordozgoith da Frota, Edgar Aparecido Sanches
Summary: In this study, Poly(o-methoxyaniline) was synthesized and subjected to a heat treatment. The heat treatment resulted in a decrease in crystallinity and changes in molecular structure and shape. Additionally, it also led to a decrease in electrical conductivity.
Article
Chemistry, Multidisciplinary
Luis M. S. Garcia, Priscilla J. Zambiazi, Khaoula Chair, Tuan Duy Doan, Andrezza S. Ramos, Julio Nandenha, Rodrigo F. B. De Souza, Larissa Otubo, Adam Duong, Almir O. Neto
Summary: This study investigates the ideal relationship between the nanostructure of a palladium complex and carbon to obtain a stable, conductive, and functional reagent diffusion electrode for the partial oxidation of methane to methanol. The results suggest that a 20% mass concentration of the palladium complex supported on carbon is the most active, exhibiting lower open-circuit and power density but higher efficiency in methanol production.
Review
Food Science & Technology
Natalia L. Barboza, Josias Martins dos Anjos Cruz, Renilto Frota Correa, Carlos Victor Lamara, Alessandra Ramos Lima, Natalia Mayumi Inada, Edgar Aparecido Sanches, Jaqueline de Araujo Bezerra, Pedro H. Campelo
Summary: Buriti, one of the main fruits in the Amazon region, has significant nutraceutical properties and potential for technological and economic development. Its different parts contain various bioactive compounds with antioxidant, antimicrobial, prebiotic, anti-diabetes, and anti-cancer properties. However, there is a lack of in vivo evaluation of the bioactive compounds in buriti, highlighting the need for further research.
FOOD RESEARCH INTERNATIONAL
(2022)
Article
Chemistry, Physical
Vitoria Pistori Guimaraes, Julio Nandenha, Luiz Otavio Orzari, Orlando Fatibello-Filho, Almir Oliveira Neto, Bruno Campos Janegitz, Fernando Campanha Vicentini, Monica Helena Marcon Teixeira Assumpcao
Summary: This study investigates the use of Pd nanoparticles supported on physical mixtures of Vulcan carbon and TiO2 in different ratios. The presence of TiO2 promotes formate oxidation, and the proportion of 75:25 of carbon and TiO2 shows the highest efficiency.
Article
Green & Sustainable Science & Technology
L. M. S. Garcia, N. G. P. Filho, K. Chair, P. Kaur, A. S. Ramos, P. J. Zambiazi, R. F. B. De Souza, L. Otubo, A. Duong, A. O. Neto
Summary: Electrocatalytic carbon dioxide reduction reaction is an effective method to convert greenhouse gases into chemical fuels, and this study utilized a copper(II) complex supported on carbon black as a catalyst to convert CO2 into methanol using a polymeric electrolytic reactor - fuel cell type. The results showed that using 2.5% and 5% Cu complex achieved high faradaic efficiency.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Electrochemistry
Victoria A. Maia, Camila M. G. Santos, Nathalia F. B. Azeredo, Priscilla J. Zambiazi, Ermete Antolini, Almir O. Neto, Rodrigo F. B. de Souza
Summary: The electrochemical conversion of N2 to NH3 using a polymeric electrolyte reactor is an efficient method for green hydrogen production. In this study, a Cu/C catalyst was used in a polymeric electrolyte membrane reactor for ammonia production by nitrogen reduction. The catalyst was characterized and the results showed the presence of CuO2 and carbon phases, as well as high agglomeration of copper nanoparticles. Mass spectroscopy analysis revealed the production of N2H2 and NH3 with a maximum ammonia yield rate of 38.4 mu g h-1 cm-2 and a faradaic efficiency of 42.57%.
ELECTROCHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Josias M. dos A. Cruz, Andrezza S. S. Ramos, Renilto F. F. Correa, Edgar A. A. Sanches, Pedro H. H. Campelo, Valdely F. F. Kinupp, Jaqueline de A. Bezerra
Summary: This study evaluated the influence of heat treatment and high-intensity ultrasound on the chemical profile of Amazon fig juices. The results showed that heat treatment significantly influenced antioxidant activity, carotenoid content, and total phenolic compounds. High-intensity ultrasound affected color luminosity but had no significant effect on chemical composition.
Article
Materials Science, Multidisciplinary
Paulo V. R. Gomes, Nathalia F. B. Azeredo, Luis M. S. Garcia, Priscilla J. Zambiazi, Giovanni R. Morselli, Romulo A. Ando, Larissa Otubo, Dolores R. R. Lazar, Rodrigo F. B. de Souza, Debora F. Rodrigues, Almir O. Neto
Summary: A fast and simple method using plasma was developed to produce hybrid materials of graphene and hexagonal BN nanosheets, which showed promising photocatalytic properties for the selective reduction of CO2.
APPLIED MATERIALS TODAY
(2022)
Article
Biochemistry & Molecular Biology
Laila Yasmim dos Santos Silva, Andrezza da Silva Ramos, Debora Nogueira Cavalcante, Valdely Ferreira Kinupp, Joao Vitor da Silva Rodrigues, Bianca Muniz Lacerda Ventura, Tiago Antonio de Oliveira Mendes, Edgar Aparecido Sanches, Pedro Henrique Campelo, Jaqueline de Araujo Bezerra
Summary: The consumption of edible flowers, such as Hibiscus acetosella Welw. Ex Hiern, is beneficial for human health due to their rich bioactive compounds, high antioxidant activity, and absence of cytotoxicity. These flowers are particularly valuable for their high content of organic acids and phenolic compounds, including myricetin, quercetin derivatives, kaempferol, and anthocyanins. Therefore, they have great potential as nutraceuticals in the healthy food industry.
Article
Engineering, Chemical
Josiana Moreira Mar, Renilto Frota Correa, Andrezza da Silva Ramos, Valdely Ferreira Kinupp, Edgar Aparecido Sanches, Pedro Henrique Campelo, Jaqueline de Araujo Bezerra
Summary: This study evaluated the effects of high-intensity ultrasound on Tapirira guianensis juice and found that ultrasound technology can induce both negative and positive changes in the chemical profile of the beverages. While carotenoids may degrade, phenolic content, antioxidant capacity, and anthocyanin content can be increased.
Article
Chemistry, Multidisciplinary
Bruno D. Q. Villardi, Nivaldo G. P. Filho, Paulo V. R. Gomes, Julio Nandenha, Camila M. Godoi, Thais Lie Tagomori, Nathalia Azeredo, Rodrigo F. B. de Souza, Almir O. Neto, Priscilla J. Zambiazi
Summary: Fuel cells can convert biomass into electricity, and platinum catalysts show higher activity in the oxidation of sugars.
REVISTA VIRTUAL DE QUIMICA
(2023)
Article
Chemistry, Multidisciplinary
Araceli J. Silva, Priscilla J. Zambiazi, Paulo V. R. Gomes, Julio Nandenha, Camila M. Godoi, Rodrigo F. B. de Souza, Almir O. Neto, Nathalia F. B. Azeredo
Summary: This study investigated the application of solid electrolyte reactors and palladium catalysts for methane oxidation and energy co-generation. It was found that a higher content of palladium catalysts resulted in better electricity generation, while an intermediate content of palladium catalysts not only produced methanol, but also generated electricity.
REVISTA VIRTUAL DE QUIMICA
(2022)