Article
Chemistry, Multidisciplinary
Shakil Ahmed, Atul Kumar, Partha Sarathi Mukherjee
Summary: An emissive Pt(II) coordination polymer (TBP) was successfully synthesized by assembling a benzothiadiazole-based Pt(II) acceptor (A) with a tetraphenylethene (TPE) containing donor (L). With multiple benzothiadiazole units, TBP showed excellent reactive oxygen species generation ability and acted as an efficient photocatalyst for oxidative coupling of benzylamine under visible light. It achieved full conversion within 2 hours at room temperature and demonstrated reusability for multiple cycles, along with easy separation of the product.
CHEMICAL COMMUNICATIONS
(2023)
Review
Chemistry, Organic
Branislav Kokic, Bojan Vulovic, Milos Jovic, Ana Andrijevic, Vladimir Ajdacic, Igor M. Opsenica
Summary: The combination of sustainable cobalt catalysis with the addition of carbon electrophiles to carbonyls and imines has proven to be an effective strategy for constructing C-C bonds. This approach exhibits remarkable functional group tolerance and selectivity, providing reliable methods for bond formation. The systematic evaluation of cobalt-catalyzed additions in this review offers a clearer perspective and inspiration for further development.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Saeed Ataie, Samantha L. Dudra, Erin R. Johnson, R. Tom Baker
Summary: Anionic ligands with nonbonded lone pairs have been widely utilized in bifunctional catalytic reactions with metal centers. A NHC Co-II (& kappa; (3)-SNS) imine-dithiolate complex (Co-3) selectively catalyzes the hydroboration of aldehydes (vs. ketones) in 4-30 min at a 1 mol% loading in benzene. VTNA kinetic studies reveal first-order dependence on the concentrations of Co-3, aldehyde, and pinacolborane, as well as significant product inhibition. DFT studies confirm a bifunctional transition state with B-H activation favored at the 5-membered ring thiolate donor.
Article
Chemistry, Multidisciplinary
Bernard G. Stevenson, Ethan H. Spielvogel, Emily A. Loiaconi, Victor Mulwa Wambua, Roman Nakhamiyayev, John R. Swierk
Summary: While photoredox catalysis has been influential in modern synthetic chemistry, a detailed mechanistic study of alpha-aminoarylation mechanism reveals its complexity and low external quantum yield despite high product yields. The use of transient absorption spectroscopy allowed for identification of productive and unproductive reaction pathways and assignment of rate constants, providing a comprehensive understanding of the reaction. Kinetic modeling showed that the reaction is limited by scattering losses and parasitic absorption rather than individual kinetics steps.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Anne V. Le, Biplab Rajbanshi, Raul F. Lobo, Peng Bai
Summary: In this study, DFT calculations were used to investigate the mechanisms of propene metathesis catalyzed by WOx/SiO2. The results showed that there are still many mechanisms of heterogeneous catalyzed metathesis reactions that are not well understood. The pseudo-Wittig mechanism was found to be the most favorable method for generating initial alkylidene active sites. The allylic and vinylic C-H activations are more difficult and require the reduction of surface sites to W(+4).
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Ebbin Joseph, Rafael D. Hernandez, Jon A. Tunge
Summary: Sustainable catalysis: The development of a cobalt-catalyzed decarboxylative allylation of nitrophenyl alkanes, nitroalkanes, and ketones is accomplished. The protocol offers the regioselective synthesis of various allylated products with broad functional group tolerance. Mechanistic studies revealed an unusual activation of Co(II)-salts using new organoreductants.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Logan E. Vine, Ryan D. Reeves, Eleanor M. Landwehr, Israel Fernandez, Jennifer M. Schomaker
Summary: This study demonstrates predictable control over the mechanism of Pd-catalyzed allene cross-coupling/cyclization and cycloisomerization by targeted changes to the reaction conditions, resulting in the successful access to enantioenriched cyclopropanes and cyclopentenes. Furthermore, it shows a simple switch of the ligand on Pd can divert the reactivity of allenyl malonate from cross-coupling/cyclization to cycloisomerization.
Article
Chemistry, Multidisciplinary
Taemin Kim, Dong Il Park, Sojin Kim, Dibya Yadav, Sugyeong Hong, Sun Hee Kim, Hyo Jae Yoon, Kyoungsuk Jin
Summary: This study reports an electrochemical reductive amination method for sustainable synthesis. Cu metal electrodes achieved Faradaic efficiencies of about 83%. The origin of protons during the electrochemical reductive amination process was scrutinized through experiments with deuterated solvent and additional proton sources. CW-EPR analysis captured the radical intermediate species formed during the catalytic cycle, advancing the mechanistic understanding of electrochemical reductive amination.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Dibyajyoti Panja, Sadhan Dey, Sabuj Kundu
Summary: Heterogeneous cobalt catalysts were synthesized and the catalyst with cobalt:phenanthroline ratio of 1:6 showed the highest activity. The selective degradation of azo compounds using various alcohols was effectively carried out. The catalyst could be recycled up to 6th times and the reaction was favorable for substrates with electron-donating substituents. Alcohol dehydrogenation was identified as one of the slow steps and ordered transition states were demonstrated.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Sara Lopez-Resano, Sara Martinez de Salinas, Felipe A. Garces-Pineda, Andrea Moneo-Corcuera, Jose Ramon Galan-Mascaros, Feliu Maseras, Monica H. Perez-Temprano
Summary: The potential access to Co-IV species to promote transformations challenging at Co-III in Cp*Co-catalyzed C-H functionalization reactions remains underexploited. We reveal the participation of Cp*Co-IV species in a Cp*Co-mediated C-S bond-reductive elimination through a combined experimental and computational strategy. These studies support the intermediacy of high-valent Cp*Co species in C-H functionalization reactions, particularly when involving nucleophilic coupling partners under oxidative conditions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Jieshuai Xiao, Minyan Wang, Xuwen Yin, Shuo Yang, Pei Gu, Xueli Lv, Yue Zhao, Zhuangzhi Shi
Summary: The first asymmetric reductive (hetero)arylations of imines using aryl and heteroaryl halides enabled by a chiral cobalt-bisphosphine catalyst are reported. This approach shows good functional group compatibility and complements the reported strategy without use of organometallic reagents. Mechanistic investigations supported that aryl-cobalt, instead of an arylzinc reagent, was formed in situ in this reductive aryl-addition event.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Yiyang Ma, Bingxuan Ji, Xiaofan Lv, Dongbin Xiong, Xuesong Zhao, Haijiao Xie, Zhenghua Zhang
Summary: In this study, boron nitride (BN)-Co3O4 nanosheet cluster (NC) was fabricated to facilitate PMS activation for the rapid removal of ranitidine (RAN). The BN-Co3O4 NC showed highly efficient catalysis performance and could be applied in a wide pH range. The porous structure of BN-Co3O4 NC enhanced the catalytic performance by providing more channels for RAN and PMS molecules. PMS activation by BN-Co3O4 NC was mainly achieved through reduction via active radicals.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Xinyuan Lv, Miao Yu, Yali Guo, Minghao Sui
Summary: In this study, silver-doped cobalt ferrite catalysts were synthesized and used for the activation of peroxymonosulfate in the degradation of sulfamethoxazole. The results showed that Ag-0.06-CoFe2O4 exhibited the best catalytic activity and utilization efficiency, and the silver doping led to the exposure of more active sites and an increase in the concentration of oxygen vacancies.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Sonia Bajo, Cyril A. Theulier, Jesus Campos
Summary: We investigated the catalytic applications of a pincer-type rhodium-germyl complex in several transformations, including semi-hydrogenation of internal alkynes, isomerization of olefins, and hydrosilylation of alkynes. The catalyst with the germyl fragment showed superior selectivity towards E-isomers compared to other rhodium precursors. To enhance this selectivity, a tandem catalytic protocol that incorporated the use of a heterogeneous catalyst for semi-hydrogenation of internal alkynes was developed.
Article
Chemistry, Physical
Zhengyu Han, Gang Liu, Xuanliang Yang, Xiu-Qin Dong, Xumu Zhang
Summary: The study developed an efficient and simple synthetic strategy for obtaining both enantiomers of chiral tetrahydroquinoline derivatives through the adjustment of reaction solvents. Gram-scale asymmetric hydrogenation proceeded well with low-catalyst loading, and a possible reaction process was revealed based on various experiments conducted.
Article
Materials Science, Multidisciplinary
Srinivasagam Ramesh, B. Bhuvaneshwari, G. S. Palani, D. Mohan Lal, K. Mondal, Raju Kumar Gupta
Article
Chemistry, Physical
B. Bhuvaneshwari, S. Vivekananthan, G. Sathiyan, G. S. Palani, Nagesh R. Iyer, Prabhat K. Rai, K. Mondal, Raju Kumar Gupta
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Chemistry, Physical
Dibyajyoti Panja, Anirban Sau, Bhuvaneshwari Balasubramaniam, Partha Dhara, Raju K. Gupta, Sabuj Kundu
Summary: The synthesis of various substituted pyrrole derivatives was achieved using bio-waste caffeine carbon-supported heterogeneous cobalt catalyst. The highest catalytic activity was observed with Co(OAc)(2)-CC-800. Kinetic experiments and Hammett studies were conducted to understand the mechanism and electronic effects of this transformation, showing its practical applicability in the synthesis of pyrroles and anti-tubercular agents.
JOURNAL OF CATALYSIS
(2021)
Article
Engineering, Electrical & Electronic
Govindasamy Sathiyan, Dhamodiran Mathivanan, Balasubramaniam Bhuvaneshwari, Ashish Garg, Raju Kumar Gupta, Anand Singh
Summary: This study successfully synthesized a novel oligomer TRZBT via Wittig-Horner reaction, which possesses good optical properties and high sensitivity in detecting nitro-explosives.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Physical
Srinu Akula, Prabakaran Varathan, Aiswarya Kesh, Kaido Tammeveski, Shaik Gouse Peera, Subhendu Kumar Panda, Bhuvaneshwari Balasubramaniam, Akhila Kumar Sahu
Summary: The morphology of carbon nanofibers and their interaction with Pt nanoparticles significantly affect the performance of fuel cell electrocatalysts. In this study, the effects of N-F co-doping on the morphology and performance of graphitic carbon nanofibers (GNFs) were investigated. The GNFs-NF-Pt catalysts exhibit enhanced oxygen reduction reaction (ORR) activity and durability, attributed to the morphological evolution and the doped N-F heteroatoms. Among them, the H-NF-Pt catalyst shows outstanding ORR activity and electrochemical stability, with only a 20 mV loss in half-wave potential after 20,000 potential cycling. The PEMFC using H-NF-Pt as a cathode catalyst achieves a power density of 0.942 W cm(-2) at a current density of 2.50 A cm(-2) without backpressures in H-2 -O-2 feeds. The hierarchical architecture of the H-NF-Pt catalyst enables excellent performance at a minimized catalyst loading, thus reducing the overall cost of the fuel cell.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Biomedical
Bhuvaneshwari Balasubramaniam, Shreedevi Arun Kumar, Kanwar Abhay Singh, Sukanya Bhunia, Kartikey Verma, Limei Tian, Raju Kumar Gupta, Akhilesh K. Gaharwar
Summary: Molybdenum disulfide (MoS2) nanostructures with varying defect density were synthesized and shown to have enhanced hydrophilicity. Incorporating these nanostructures within electrospun polyacrylonitrile (PAN) nanofibers improves their physical and chemical properties, including electrical conductivity, thermal stability, and mechanical strength. Additionally, the addition of MoS2 nanostructures enhances protein adsorption and cytocompatibility, making them potentially useful for biomedical applications.
ADVANCED NANOBIOMED RESEARCH
(2022)
Review
Chemistry, Medicinal
Bhuvaneshwari Balasubramaniam, Prateek, Sudhir Ranjan, Mohit Saraf, Prasenjit Kar, Surya Pratap Singh, Vijay Kumar Thakur, Anand Singh, Raju Kumar Gupta
Summary: The ongoing COVID-19 pandemic has raised awareness about preventing the spread of microorganisms, leading to increased interest in research on surfaces that can destroy or inhibit microbial/viral entities. While there is more research available on antibacterial materials, there is a relative scarcity of data on antiviral materials. However, with continued research in this area, new information is constantly being added to the literature, highlighting the potential for breakthrough interventions in mitigating disease spread.
ACS PHARMACOLOGY & TRANSLATIONAL SCIENCE
(2021)
Review
Nanoscience & Nanotechnology
Shreedevi Arun Kumar, Bhuvaneshwari Balasubramaniam, Sukanya Bhunia, Manish K. Jaiswal, Kartikey Verma, Prateek, Ali Khademhosseini, Raju Kumar Gupta, Akhilesh K. Gaharwar
Summary: Two-dimensional (2D) metal organic frameworks (MOFs) are emerging layered nanomaterials with defined structure and composition, showing potential for various biomedical applications.
WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
V Parthiban, Balasubramaniam Bhuvaneshwari, J. Karthikeyan, P. Murugan, A. K. Sahu
NANOSCALE ADVANCES
(2019)
Review
Chemistry, Physical
Bhuvaneshwari Balasubramaniam, Narendra Singh, Prasenjit Kar, Ankit Tyagi, Jai Prakash, Raju Kumar Gupta
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2019)
Article
Chemistry, Multidisciplinary
Ankit Tyagi, Manish Chandra Joshi, Kushagra Agarwal, Bhuvaneshwari Balasubramaniam, Raju Kumar Gupta
NANOSCALE ADVANCES
(2019)
Article
Chemistry, Multidisciplinary
G. Sathiyan, B. Balasubramaniam, S. Ranjan, S. Chatterjee, P. Sen, A. Garg, R. K. Gupta, A. Singh
MATERIALS TODAY CHEMISTRY
(2019)
Article
Chemistry, Physical
Srinu Akula, Bhuvaneswari Balasubramaniam, Prabakaran Varathan, Akhila Kumar Sahu
ACS APPLIED ENERGY MATERIALS
(2019)
Review
Chemistry, Multidisciplinary
Swati Verma, Bhuvaneshwari Balasubramaniam, Raju Kumar Gupta
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2018)