Article
Environmental Sciences
Ionela Birloaga, Francesco Veglio
Summary: The current paper presents an innovative hydrometallurgical methodology for recovery of precious metals from different waste streams. The method involves a single leaching system and selective recovery of elements from solution by chemical reduction/processes. This process provides a new way to recycle precious metals and prevent environmental pollution.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Inorganic & Nuclear
Hadi Hachem, Olivier Jeannin, Hengbo Cui, Reizo Kato, Marc Fourmigue, Dominique Lorcy
Summary: A novel N-methyl substituted, radical anionic complex [Ni(Me-thiazSe-dt)(2)](1-) is synthesized by combining the N-R substitution found in [Ni(R-thiazdt)(2)] complexes and the selone substitution found in [Ni(dmiSe)(2)] complex. This anionic complex and its mixed-valence Et4N+ salt exhibit a rare cis arrangement of the dithiolene ligands and form well-isolated dimerized chains in the 1 : 2 [Et4N][Ni(Me-thiazSe-dt)(2)](2) salt, showing strong one-dimensional character. Despite its Mott insulator behavior, the compound retains high RT conductivity of 4.6 S cm(-1) and small activation energy of 33 meV under pressures up to 10 GPa.
DALTON TRANSACTIONS
(2023)
Review
Biochemistry & Molecular Biology
Olga Klaudia Szewczyk, Piotr Roszczenko, Robert Czarnomysy, Anna Bielawska, Krzysztof Bielawski
Summary: Nanotechnology shows great potential in advanced cancer therapies, allowing for simultaneous drug administration and immune system engagement. Nanoparticles can locate metastases and deliver medications, effectively reducing tumors with minimal toxicity to healthy tissue.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Chemistry, Multidisciplinary
Tianyu Li, David A. Harrington
Summary: This review discusses the reaction mechanisms of glycerol electrooxidation, emphasizing the inferiority of Pd compared to Pt electrodes in cleaving glycerol C-C bonds and the reasons for CO2 generation at high overpotentials. A new reaction mechanism is proposed to explain the generation of side products. Additionally, experimental results for Ni electrodes and the performance of multi-metallic electrocatalysts are presented.
Article
Biochemistry & Molecular Biology
Oliver Bysewski, Andreas Winter, Phil Liebing, Ulrich S. Schubert
Summary: N-Heterocyclic carbenes (NHCs) are widely used compounds, with benzimidazole and imidazole derivatives being commonly used. Caffeine, which contains an imidazole unit, has been used as a carbene-type ligand before, but its use in a tridentate bis-NHC system has not been reported. The ligand can be synthesized easily, and metal complexes can be obtained through silver-salt metathesis. Platinum(II) and palladium(II) complexes were successfully isolated, and the crystal structure of the platinum complex was analyzed. Luminescence was observed in both the solid state and solution for the Pt(II) complex.
Article
Chemistry, Organic
M. Carla Aragoni, Massimiliano Arca, Claudia Caltagirone, Carlo Castellano, Francesco Demartin, Peter G. Jones, Tiziana Pivetta, Enrico Podda, Vito Lippolis, Sergio Murgia, Giacomo Picci
Summary: The reactivity of compounds L1 and L2 towards I2 under different experimental conditions was investigated and compared to that in CH2Cl2. Several compounds were obtained and characterized, and their ionic nature was confirmed by X-ray diffraction analysis. Density functional theory calculations provided insights into the properties and formation mechanisms of these compounds.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Vladimir K. Osmanov, Rizvan K. Askerov, Evgeniy Chipinsky, Galina N. Borisova, Victor N. Khrustalev, Alexander O. Chizhov, Alexander S. Peregudov, Jonathan Cisterna, Alexander Borisov, Ivan Brito
Summary: The title compound was synthesized using a two-step procedure, including condensation and cyclization reactions. The compound was further oxidized to form diselenides or triazole products, and alkylated to produce different derivatives. Spectroscopic and X-ray diffraction techniques were used to characterize and analyze the synthesized compounds.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Multidisciplinary
Luong Phong Ho, Angelika Neitzel, Thomas Bannenberg, Matthias Tamm
Summary: In this study, a series of sulfur and selenium compounds with different metal complexes were synthesized through experimental and computational methods, revealing their bonding situation and properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Sebastian Scharf, Sebastian Notz, Janine Jeschke, Andrea Preuss, Tobias Rueffer, Alexander Wiese, Andy Kuenzel-Tenner, Steffen Schulze, Michael Hietschold, Heinrich Lang
Summary: This study discusses the synthesis of [M(O2CCH2(OCH2CH2)nOMe)2(PR3)2] complexes and their thermal decomposition. The structures of the complexes in the solid state were determined by X-ray crystallography, revealing trans or cis configurations of the ligands. Thermal decomposition of the complexes led to the formation of metal nanoparticles. The Pd nanoparticles exhibited good catalytic performance in the Suzuki-Miyaura C,C cross-coupling reaction, while the Pt nanoparticles showed minor activity in the hydrosilylation reaction.
Article
Chemistry, Multidisciplinary
M. K. Mohammad Ziaul Hyder, Bungo Ochiai
Summary: The synthesis and practical application of a novel scavenger for precious metals was reported. The scavenger was found to have the capability to adsorb Ag(I), Pd(II), and Au(III) from aqueous media under different conditions, and exhibited good regeneration performance.
Article
Chemistry, Physical
Theo Faverge, Bruno Gilles, Antoine Bonnefont, Frederic Maillard, Christophe Coutanceau, Marian Chatenet
Summary: The mechanisms of oxidation of glucose, gluconic acid, and sorbitol on gold, platinum, and palladium are investigated using cyclic voltammetry, differential electrochemical mass spectrometry, and in situ Fourier transform infrared spectroscopy. The nature of the reactant significantly influences the onset of the oxidation reaction, with glucose's anomeric function oxidized at low potentials on all three surfaces, while gluconic acid and sorbitol poison the surface at low potentials. Different reaction pathways are observed based on the metal surface, and gold features the best activity, selectivity, and specificity for glucose oxidation into gluconate at low potentials. The study highlights the dependence of the mechanism on reactant, catalyst, and potential.
Article
Chemistry, Physical
Theo Faverge, Bruno Gilles, Antoine Bonnefont, Frederic Maillard, Christophe Coutanceau, Marian Chatenet
Summary: The oxidation mechanisms of glucose, gluconic acid, and sorbitol on gold, platinum, and palladium surfaces were studied using cyclic voltammetry, differential electrochemical mass spectrometry, and in situ Fourier transform infrared spectroscopy. The nature of the reactant influenced the onset of the oxidation reaction, with glucose being oxidized at low potentials on all three surfaces, while gluconic acid and sorbitol exhibited poisoning effects. The metal surface also influenced the reaction pathways, with glucose oxidation being initiated through the partial dissociative adsorption of glucose on all three surfaces. Gold demonstrated the highest activity, selectivity, and specificity for glucose oxidation to gluconate at low potentials. The study reveals a reactant, catalyst, and potential-dependent mechanism.
Article
Engineering, Environmental
Joseph Brindle, Michael M. Nigra
Summary: The selective oxidation of methane is a challenging process, but AuPd nanoparticles have shown promise in activating methane at moderate temperatures and pressures. Through experimental studies, the formation of different surface intermediates and their relationship with selectivity and activity have been explored. It has been hypothesized that water and copper oxide can facilitate the selective oxidation of methane. The results indicate that AuPd catalysts are more active than monometallic Au and Pd catalysts in the presence of water, and the unprotonated formate can increase the methane oxidation rate. Additionally, copper oxide improves the selectivity of methane towards CO but decreases the overall methane consumption.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Elzbieta Radzyminska-Lenarcik, Ilona Pyszka, Artur Kosciuszko
Summary: This study demonstrates that a new amine derivative EDAB-acac can effectively separate a mixture containing Au(III), Pd(II), and Pt(IV) ions in an acidic medium (HCl) using solvent extraction. The impact of acid concentration and solvent type on separation efficiency was discussed, with high donor number solvents enhancing extraction. A 3-step stripping process for the recovery of Pd(II), Au(III), and Pt(IV) from the mixture was proposed, making it useful for e-waste recycling.
Article
Chemistry, Multidisciplinary
Fulai Hao, Xinying Miao, Manman Zhang, Zhen Dong, Maolin Zhai, Yanbai Shen, Jianhua Zu, Jun Yang, Long Zhao
Summary: In this study, a poly(ionic liquid) gel containing an imidazole group was fabricated and demonstrated high adsorption efficiency and selectivity for Au(iii), Pt(iv), and Pd(ii) ions in a wide pH range.
NEW JOURNAL OF CHEMISTRY
(2022)
