Article
Urology & Nephrology
Susana Garcia-Abellan, Vincenzo Passarelli, Manuel Iglesias
Summary: Two Ir complexes, 2a and 2b, with the ligand [Ir(CI)(COD)(NHC)] (COD=1,5-cyclooctadiene), were synthesized through transmetallation from NHC-Ag complexes. Analogously, another Rh complex, 4, was prepared using the same method. By transmetallation from the deprotonated NHC-Ag complex, another Ir complex, 3c, with the ligand [Ir({kappa-C,N-(NHC-acetamide-1H)}(COD)], was synthesized. Similarly, [Ir(CI)(CO)(2)(NHC)] (6) and [Ir({kappa-C,N-(NHC-acetamide-1H)}(CO)(2)] (7) were obtained through carbonylation of 2b and 3c respectively. The catalytic activity of these complexes in formic acid dehydrogenation was evaluated, with the highest turnover frequency (TOF) observed in the presence of a 5:2 HCOOH/Et3N mixture. Stoichiometric experiments suggested COD hydrogenation as the preactivation step.
Article
Chemistry, Inorganic & Nuclear
Susana Garcia-Abellan, Vincenzo Passarelli, Manuel Iglesias
Summary: 2a and 2b [Ir(CI)(COD)(NHC)] (1,5-cyclooctadiene as COD) were synthesized by transmetallation from NHC-Ag complexes. Analogously, [Rh(CI)(COD)(NHC)] (4) was prepared. [Ir({kappa-C,N-(NHC-acetamide-1H)}(COD)] (3c) was synthesized by transmetallation from deprotonated NHC-Ag complex. [IrCp*({kappa-C,N-(NHC-acetamide-1H)}] (5) (Cp*=pentamethylcyclopentadienyl) was obtained analogously. [Ir(CI)(CO)(2)(NHC)] (6) and [Ir({kappa-C,N-(NHC-acetamide-1H)}(CO)(2)] (7) were prepared by carbonylation of 2b and 3c, respectively. The catalytic activity of these complexes in formic acid dehydrogenation was evaluated under solventless conditions, in the presence of water as a cosolvent, and in a 5 : 2 HCOOH/Et3N mixture, with the best TOF values obtained in the latter case. Stoichiometric experiments suggest COD hydrogenation as the preactivation step.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Rakesh R. Behera, Ratnakar Saha, Alamsaty Ashis Kumar, Subrat Sethi, Narayan Ch. Jana, Bidraha Bagh
Summary: Catalysis with base metal manganese has gained significant interest recently. However, catalysis with manganese complexes having N-heterocyclic carbenes (NHCs) is not as well-developed as those possessing pincer ligands. In this study, two imidazolium salts decorated with picolyl arms were synthesized as NHC precursors and successfully coordinated with MnBr(CO)(5) to form manganese(I)-NHC complexes. These complexes showed good catalytic activity in the hydrosilylation of terminal alkynes, with complex 1 exhibiting high selectivity towards less thermodynamically stable & beta;-(Z)-vinylsilanes.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Polymer Science
Katarzyna Mitula, Rafal Januszewski, Julia Duszczak, Monika Rzonsowska, Beata Dudziec
Summary: A series of unique organic-inorganic hybrid materials were designed, synthesized, and characterized using spectroscopic methods. The synthesis strategy was optimized to achieve high conversion rates, and the results revealed the influence of the type and content of the applied double-decker silsesquioxanes on the properties of the materials. This study can lead to the preparation of materials with tailored properties.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Franck Ulm, Saurabh Shahane, Lai Truong-Phuoc, Thierry Romero, Vasiliki Papaefthimiou, Matthieu Chesse, Michael J. Chetcuti, Cuong Pham-Huu, Christophe Michon, Vincent Ritleng
Summary: The preparation of cationic nickel complexes with bidentate coordination and their activity in aldehyde reduction are studied. The nanoparticles involving NHC-picolyl-Ni are observed under specific conditions, showing potential applications in catalysis.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Miguel Gonzalez-Lainez, M. Victoria Jimenez, Vincenzo Passarelli, Jesus J. Perez-Torrente
Summary: Neutral and cationic cyclooctadiene rhodium(i) complexes with a lutidine-derived polydentate ligand have been synthesized and found to efficiently catalyze the hydrosilylation of 1-hexyne with high selectivity. These catalysts exhibit a different β-(Z) selectivity compared to previously reported rhodium(i) catalysts based on 2-picolyl-functionalized NHC ligands. Kinetic studies suggest an energy barrier of 19.8±2.0 kcal mol(-1) for the hydrosilylation reaction.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Romane Manguin, Maria Galiana-Cameo, Tanakorn Kittikool, Cecile Barthes, Jompol Thongpaen, Etienne Bancal, Sonia Mallet-Ladeira, Sirilata Yotphan, Ricardo Castarlenas, Marc Mauduit, Jean-Baptiste Sortais, Olivier Basle
Summary: This article discusses the synthesis and characterization of a new series of iridium complexes with NHC-carboxylate ligands, which exhibit efficient catalytic activities in dehydrogenative directed C-H silylation of arenes, with excellent ortho-selectivity control.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Kinga Stefanowska, Jakub Szyling, Jedrzej Walkowiak, Adrian Franczyk
Summary: Trifunctional incompletely condensed polyhedral oligomeric silsesquioxanes (RSiMe2O)(3)R'7Si7O9 (IC-POSSs) have been successfully synthesized via platinum-catalyzed hydrosilylation of alkynes, showing potential applications in the synthesis of novel hybrid materials with unique properties.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Daven Foster, Pengchao Gao, Ziyun Zhang, Gellert Sipos, Alexandre N. Sobolev, Gareth Nealon, Laura Falivene, Luigi Cavallo, Reto Dorta
Summary: Chiral, cationic NHC-iridium complexes have been introduced as catalysts for the intramolecular hydroamination reaction of unactivated aminoalkenes, showing high activity and selectivity. By eliminating a major deactivation pathway, the efficiency of the reaction is improved. Through experimental and computational studies, valuable insights into the reaction mechanism have been gained.
Review
Biochemistry & Molecular Biology
Maria Talavera, Sandra Bolano
Summary: This methodology utilizes iridium to synthesize polycyclic metallaaromatic hydrocarbons, and aims to broaden the scope and selectivity of the method, while also stabilizing the complexes obtained, in order to open the door to new materials based on graphene fragments.
Article
Chemistry, Inorganic & Nuclear
Babulal Maji, Abhishek Kumar, Arindom Bhattacherya, Jitendra K. Bera, Joyanta Choudhury
Summary: Efficient bidirectional catalysts have been developed for hydrogenation and dehydrogenation of CO2 and formic acid, enabling the development of a rechargeable hydrogen carrier system and a CO2-recycling mechanism. This approach provides a promising option for carbon-neutral H2-based fuel.
Article
Chemistry, Multidisciplinary
Malgorzata Bolt, Aleksandra Mermela, Patrycja Zak
Summary: A new catalytic system based on an octacarbonyl dicobalt(0) complex and bulky ligand has been developed for the selective hydrogermylation of alkynes, leading to the synthesis of a-vinylgermanes. It has been demonstrated that catalytic systems with less sterically demanding ligands are ineffective in promoting this transformation.
CHEMICAL COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
M. Victoria Jimenez, Ana Ojeda-Amador, Raquel Puerta-Oteo, Joaquin Martinez-Sal, Vincenzo Passarelli, Jesus J. Perez-Torrente
Summary: Iridium(I) compounds with bridge-functionalized bis-NHC ligands were prepared and showed high activity and selectivity in the oxidative dehydrogenation of glycerol to lactate. The hydroxy-functionalized bis-NHC catalysts were more active than the carboxylate-functionalized ones and the unbridged bis-NHC iridium(I) catalyst.
Review
Chemistry, Inorganic & Nuclear
Estefan van Vuuren, Frederick P. Malan, Marile Landman
Summary: The incorporation of N-tethers into N-heterocyclic carbene ligands has led to the development of a powerful class of multidentate, responsive ligand frameworks that have shown success and usefulness in various applications, particularly in homogeneous catalysis. These NHC complexes of group IX transition metals exhibit a wide range of accessible oxidation states, favorable stabilities, and reactivities, and have been the subject of significant research interest in the past two decades. The inclusion of carbon as a secondary binding atom has enabled these metal complexes to undergo complex C-H activation, small molecule fixation and activation, and unusual migratory insertion reactions.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Estefan van Vuuren, Frederick P. Malan, Marile Landman
Summary: Novel Ir-based NHC complexes (1-4) were synthesized using N-alkenyl functionalized imidazolium salts with Ir(iii) precursors. Complex 1 represents an unprecedented cyclometallated complex, which is the first and only example in literature, to our knowledge, of a non-aromatic C(sp(2))-H activation leading to a C(sp(3))-Ir cyclometallated product. Subsequent reactions with a range of imidazolium salts featuring different N-pendant arms were performed, including alkenyl and benzyl tethers. Selectivity with regards to cyclometallation behavior of the iridium center was observed in preference for a benzyl cyclometallated product over alkenyl cyclometallation. Benzyl-containing products proved most promising as active catalysts in both the hydrosilylation of internal alkynes with a conversion of up to 59% after 1 hour, as well as the transfer hydrogenation of ketone and aldehyde substrates with conversions of up to 100% after 18 hours using catalyst loadings of 4 and 1 mol% respectively.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Raul Porcar, Andres Mollar-Cuni, David Ventura-Espinosa, Santiago Luis, Eduardo Garcia-Verdugo, Jose A. Mata
Summary: A simple, safe, and robust system for the continuous, in situ, and on-demand generation of highly pure hydrogen under mild conditions is reported. The system utilizes a catalyst supported on graphene for the dehydrogenative coupling reaction, and the generated hydrogen can be used for further hydrogenation reactions.
Article
Chemistry, Physical
Adrian Garcia-Zaragoza, Christian Cerezo-Navarrete, Andres Mollar-Cuni, Pascual Ona-Burgos, Jose A. Mata, Avelino Corma, Luis M. Martinez-Prieto
Summary: The catalytic properties of graphene-supported ruthenium nanoparticles have been adjusted by modifying their metal surface with pyrene-tagged N-heterocyclic-carbene ligands. The activity and selectivity of the catalyst are highly dependent on the surface coverage of the ligands, with higher coverage leading to lower activity but higher selectivity. The reactivity and stability of the catalysts can be controlled by modifying the surface with specific ligands.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Cesar Ruiz-Zambrana, Rajeev K. Dubey, Macarena Poyatos, Aurelio Mateo-Alonso, Eduardo Peris
Summary: A series of rhodium and iridium complexes with a N-heterocyclic carbene (NHC) ligand decorated with a perylene-diimide-pyrene moiety were studied. These complexes can undergo reduction events associated with the attached perylene-diimide-pyrene moiety, leading to an increase in the ligand's electron-donating character. The rhodium complex showed redox-switchable behavior in the [3+2] cycloaddition reaction.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Susana Ibanez, Eduardo Peris
Summary: Two different metallotweezers were used as hosts for a series of planar aromatic guests. The binding strength and models of the two metallotweezers differed due to their structural differences.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Cesar Ruiz-Zambrana, Macarena Poyatos, Eduardo Peris
Summary: A gold complex with a naphthalene-di-imide-functionalized N-heterocyclic carbene (NHC) ligand was prepared and its reversible redox properties and catalytic activity in the hydroamination of terminal alkynes were studied.
Article
Chemistry, Physical
Carmen Mejuto, Laura Ibanez-Ibanez, Gregorio Guisado-Barrios, Jose A. Mata
Summary: This study describes an effective visible-light-promoted iridium catalyst that enables hydrogen production at room temperature without additives. The single iridium complex in the photocatalytic system plays a dual role in harvesting visible light and facilitating C-H cleavage and H-2 formation. The presence of specific ligands in the iridium complex is crucial for the photocatalytic transformation, and the complex also acts as an efficient catalyst for thermal reverse process under mild conditions.
Article
Chemistry, Multidisciplinary
Alejandro Lopez-Moreno, Susana Ibanez, Sara Moreno-Da Silva, Luisa Ruiz-Gonzalez, Natalia Martin Sabanes, Eduardo Peris, Emilio M. Perez
Summary: Mechanically interlocked derivatives of carbon nanotubes (MINTs) are interesting and stable nanotube products. This study explores the encapsulation of single-walled carbon nanotubes within a palladium-based metallosquare, revealing the sensitivity of MINT formation to structural variations of the metallo-assemblies. The study also demonstrates the potential application expansion of MINTs through supramolecular coordination complexes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Biochemical Research Methods
Andres Mollar-Cuni, Laura Ibanez-Ibanez, Gregorio Guisado-Barrios, Jose A. Mata, Cristian Vicent
Summary: Selective activation of C-H bonds in metal complexes has been investigated using ion mobility spectrometry mass spectrometry-based approaches. The study also explores the fragmentation of the resulting ions to identify specific isomers formed from C(sp2)-H or C(sp3)-H bond activation. The conformational changes of the NHC ligands upon C-H bond activation are discussed based on estimated collision cross sections.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2022)
Article
Chemistry, Multidisciplinary
Sebastian Martinez-Vivas, Macarena Poyatos, Eduardo Peris
Summary: H-1 NMR studies showed that a cationic complex with a pyridine-di-imidazolylidene pincer ligand exhibited high binding affinity with coronene in CH2Cl2. This binding was established through π-stacking interactions between coronene and the planar Rh-I complex. The interaction influenced the electron-donating strength of the pincer CNC ligand and increased the reaction rate of nucleophilic attack of methyl iodide on the rhodium (I) pincer complex, as well as enhancing its catalytic activity in the cycloisomerization of 4-pentynoic acid. These findings highlight the significance of supramolecular interactions in modifying the reactivity and catalytic activity of square-planar metal complexes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Susana Ibanez, Katarzyna Swiderek, Eduardo Peris
Summary: Mechanically interlocked molecules (MIMs) have attracted attention for their unique properties in various applications. This study presents a tetragold(I) rectangle-like metallobox that can easily encapsulate a pyrene molecule with four octynyl substituents. Unlike typical MIMs, this molecule can release the guest by the addition of coronene, which compresses the flexible limbs of the guest to facilitate its sliding in and out of the metallobox.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Lucas H. R. Passos, Victor Martinez-Agramunt, Dmitry G. Gusev, Eduardo Peris, Eduardo N. dos Santos
Summary: The reduction of esters and aldehydes to alcohols is an important reaction in the chemical industry. The behavior of three commercially available Ru-catalysts for the hydrogenation of these feedstocks is reported. Selective hydrogenation of the ester or aldehyde functionality while keeping the C=C double bond intact is possible, and mild reaction conditions and a sustainable solvent are suitable for these catalytic hydrogenations.
Article
Chemistry, Inorganic & Nuclear
Cristian Gutierrez-Pena, Macarena Poyatos, Eduardo Peris
Summary: A series of dimetallic and monometallic Cp*Ir(III) complexes with naphthalene-diimide-decorated N-heterocyclic carbene/pyridine ligands were synthesized and characterized. The complexes showed C,C-chelating coordination of the NHC-pyridine ligand, with cyclometallation occurring on the pyridine ring. Spectroelectrochemical studies revealed that the complexes underwent two successive reduction events associated with the NDI moiety of the ligand. The complexes displayed good activity and selectivity in the dehydrative etherification by cross-coupling of primary alcohols, and a reaction mechanism involving a redox-neutral acid-catalyzed pathway was proposed based on mechanistic studies.
Article
Chemistry, Multidisciplinary
Sebastian Martinez-Vivas, Dmitry G. Gusev, Macarena Poyatos, Eduardo Peris
Summary: We report a rhodium(I) complex with modulable electronic nature through supramolecular and redox stimuli. The complex shows strong pi-pi-stacking interaction with coronene, affecting its electron-richness. Addition of tetrabutylammonium fluoride sequentially reduces the ligand's NDI moiety, enhancing its electron-donor strength. The complex's catalytic activity in the cycloisomerization of alkynoic acids can be modulated by the addition of fluoride, resulting in four levels of activity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Inorganic & Nuclear
Jonathan Martinez-Laguna, Andres Mollar-Cuni, David Ventura-Espinosa, Santiago Martin, Ana Caballero, Jose A. Mata, Pedro J. Perez
Summary: In this study, a novel strategy was developed to functionalize C-H bonds of cyclohexane and benzene with the assistance of nanoparticulated gold catalyst. The catalyst showed exceptional activity and recyclability.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Susana Ibanez, Cristian Vicent, Eduardo Peris
Summary: In this study, a new mechanically interlocked molecule with unique molecular structure and mechanical interlocked nature was successfully prepared. Experimental validation confirmed the distinct behavior between the tert-butyl substituted tweezer and the tweezer lacking of these bulky groups.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Zihan Ma, Lishuang Wang, Tingting Chen, Guangning Wang
Summary: In this study, two kinds of 3D self-doped (N/O) lilac-based and coriander-based porous carbons with high performance have been prepared.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Qin Wang, Yun-Fan Yan, Jiao-Lin Weng, Ying Huang, Fu Yang, Hao-Hui Xie, Fei Tan, Fa-Kun Zheng, Jian-Gang Xu
Summary: Balancing energy and mechanical sensitivities is a challenging issue in the field of energetic materials. This study constructed a 3D energetic metal-organic framework with nitrogen-rich ligand and NO3- anions. The framework demonstrated high stability, energy density, and excellent mechanical sensitivities, making it a potential insensitive energetic material.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Marrium Saeed, Urooj Kamran, Amina Khan, Md Irfanul Haque Siddiqui, Hasan Jamal, Haq Nawaz Bhatti
Summary: In this study, magnesium-aluminum layered double hydroxides (Mg-Al-LDH) were synthesized using an environmentally friendly hydrothermal technique for adsorbing the dye reactive green 5 (RG5). To improve the adsorption capability, composites were prepared by combining Mg-Al-LDH with low-cost Mangifera indica stone biomass (MISB). The results showed that the composites had high adsorption capacities for RG5 dye and could be regenerated.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Xuanlin Zhan, Xiaojie Li, Yunyan Zeng, Siyan Jiang, Chao Pan, Shiyu Pan, Jiaquan Huang, Heqian Zhang, Zhiwei Qin
Summary: This study reports on the potential prospects of natural products derived from the rhizosphere for the development of antibiotics and herbicides, as well as the advancements in cultivating a mutant strain that produces a substantial quantity of lydicamycins, a potent family for herbicide development.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Jie Zhu, Jiangtao Yu, Linhua Zhu, Xiaoxiao Yu, Jixing Liu, Yanhong Chao, Jingzhou Yin, Peiwen Wu, Jian Liu, Wenshuai Zhu
Summary: This study successfully demonstrates the 3D printing of attapulgite monoliths and investigates the influence of thermal treatment on their properties. The thermal treated monoliths show superior catalytic performance at low temperatures.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Yanzhu Ye, Yixiang Ye, Jiannan Cai, Zhongshui Li, Shen Lin
Summary: In this paper, a novel Pt/CoP/C photo-electro synergistic catalyst was successfully synthesized and its performance was investigated. The catalyst exhibited excellent photo-electro catalytic performance, with significantly higher hydrogen production compared to a commercial catalyst. The introduction of cobalt phosphide and the existence of Co3O4 were identified as key factors for enhancing the catalytic activity.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Nurul Hidayah Abu Bakar, Wan Norfazilah Wan Ismail, Hartina Mohd Yusop, Noreen Farzuhana Mohd Zulkifli
Summary: Hydrophobic coatings inspired by the lotus effect have gained popularity for their ability to solve various problems. The sol-gel method, utilizing silica, alumina, and titania, is explored as an environmentally friendly approach to produce water-based hydrophobic coatings. This study focuses on producing water-based hydrophobic coatings for cotton and polyester fabrics using a one-step sol-gel method. The coated fabrics exhibited improved hydrophobic properties, altered surface morphologies, and lower air permeability compared to uncoated fabrics. TEOS-PDMS coating provides a promising approach for enhancing the hydrophobic and surface properties of cotton and polyester fabrics.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Nikita Belko, Hanna Maltanava, Anatol Lugovski, Polina Shabunya, Sviatlana Fatykhava, Evgeny Bondarenko, Pavel Chulkin, Sergey Poznyak, Michael Samtsov
Summary: This study investigates the difference in electrochemical behavior between rhodamine B hydrazide and rhodamine B acylhydrazone, and finds that rhodamine B acylhydrazone exhibits higher reversibility in electrooxidation. These results can be applied for developing new sensors with desired electrochemical properties.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Showket Ahmad Bhat, Mohd Ikram
Summary: In this study, 0-3 particulate multiferroic composites were synthesized and characterized. The composites exhibited excellent ferroelectric and ferromagnetic properties, as well as high piezoelectric strain and magnetoelectric coupling effects.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Carla Gomes, Mariana Costa, Susana M. M. Lopes, Bernardo Albuquerque Nogueira, Rui Fausto, Jose A. Paixao, Teresa M. V. D. e Melo, Luisa M. D. R. S. Martins, Marta Pineiro
Summary: The development of sustainable processes requires the integration of green chemistry principles. In this study, a solvent-free synthesis method was developed to prepare new copper catalysts, which efficiently catalyze cycloaddition reactions under solvent-free mechanochemical conditions. Through this process, the principles of atom economy, reduction of solvents and auxiliaries, design for energy efficiency, and reduction of derivatives and catalysis are combined.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Zhihua Liu, Jinzhe Li, Jianguo Zhou
Summary: This study demonstrates the enhancement of photoelectrochemical activity of BiFeO3 photoelectrodes through ion modification, which increases visible light absorption and active area, leading to improved PEC water splitting performance.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Yisheng Zhang, Wensong Li, Jing Li, Fang Li, Wei Xue, Xinqiang Zhao, Yanji Wang
Summary: Pt/C and SO42-/ZrO2 were used as catalysts for the synthesis of p-aminophenol through the catalytic transfer hydrogenation of nitrobenzene in water with formic acid as the hydrogen source. The optimal Pt loading for PAP selectivity was found to be 1 wt%. The presence of different valence states of Pt affected both the nitrobenzene hydrogenation and formic acid decomposition. Among different solid acid catalysts tested, SO42-/ZrO2 exhibited the highest catalytic activity for p-aminophenol formation. Under the optimized reaction conditions, the conversion of nitrobenzene reached 80.0%, with a selectivity of 47.6% for p-aminophenol.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Pradyota Kumar Behera, Papita Behera, Amlan Swain, Santosh Kumar Sahu, Ajeena Sahoo, Laxmidhar Rout
Summary: We have developed a simple and direct method for the synthesis of diaryl ether using an oxygen bridged bimetallic CuMoO4 nanocatalyst under mild reaction conditions. The catalyst exhibited tolerance towards a wide range of substrates with various functional groups. It is efficient and recyclable. This methodology allows easy access to nitrofen derivatives (herbicides) from unactivated 2,4-dichlorophenol, which are important for agriculture and pharmaceuticals.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Yihua Fu, Yan Zhang, Changwei Hu, Zhishan Su
Summary: The mechanism of the reaction between CO2 and styrene oxide for cyclic carbonate was revealed using density functional theory calculations. The noncatalytic reaction occurred via a concerted mechanism, while in the presence of guanidine and tetrabutylammonium iodide (TBAI) co-catalysts, the epoxide ring-opening by nucleophilic attack of an iodide anion was predicted to be the rate-determining step. Guanidine acted as the H-bond donor to activate styrene oxide, facilitating the reaction with a lower activation barrier.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Saikat Khamarui, Sirshendu Ghosh
Summary: Copper nanorods (Cu-NRs) exhibit significant plasmonic behavior and can act as efficient catalysts in redox processes and coupling. A benign decarboxylative approach, utilizing localized surface plasmon resonance (LSPR) assisted catalysis with Cu-NRs, has been developed for the production of alkane analogues from alkyl carboxylic acids under visible light. The catalyst shows a broad substrate scope and high functional group tolerance, without the need for an external oxidant or proton source. A plausible mechanism for this recyclable nano-catalyst has also been proposed based on control experiments.
NEW JOURNAL OF CHEMISTRY
(2024)
