Article
Polymer Science
Jin-Chuang Yang, Jun Yang, Tie-Ying Zhang, Xin-Jun Li, Xiao-Bing Lu, Ye Liu
Summary: The development of biodegradable and recyclable polymers has partially solved the problem of realizing a sustainable plastics economy. This study focuses on toughening poly(3-hydroxybutyrate) (P3HB), a highly crystalline thermoplastic material, by reducing its crystallinity through catalytic carbonylative terpolymerization with different enantiopure epoxides. The properties of the resulting PHA copolymers can range from viscous oil to tough/ductile and brittle plastics, depending on the structure and stereochemistry of the epoxides used.
Article
Chemistry, Multidisciplinary
Alban Falconnet, Mathieu Nicolas, Tobias Vollgraff, Rupert Konradi, Bernd Bruchmann, Dieter Rodewald, A. Stephen K. Hashmi, Thomas Schaub
Summary: (Co)poly-?-butyrolactone (pGBL) is a thermoplastic material that shows potential to replace common plastics due to its biodegradability and renewable feedstocks. Mild methods for pGBL synthesis have been developed, but often require sophisticated catalysts or low temperatures. In this study, a simple base/alcohol system using potassium tert-butoxide with benzyl alcohol or polyols was used to achieve high conversions and molecular weights of pGBL.
Article
Polymer Science
Xiaoyan Tang, Changxia Shi, Zhen Zhang, Eugene Y-X Chen
Summary: By utilizing metal-catalyzed copolymerization, the toughness of P3HB has been enhanced, resulting in a hard and tough plastic P3HB-b-PCL with distinct crystalline domains.
Article
Chemistry, Applied
Seyedeh Molood Masoom Nataj, Serge Kaliaguine, Frederic-Georges Fontaine
Summary: A post-synthetic modification of Zr-MOF using ionic nitrogen-based functional groups allows for the catalytic cycloaddition reaction of CO2 with epoxides. The functionalized MOFs show high catalytic performance under mild conditions, and the aperture size of the MOF plays an important role in the diffusion of substrates in CO2 fixation reactions.
Article
Polymer Science
Grazyna Adamus, Adrian Dominski, Marek Kowalczuk, Piotr Kurcok, Iza Radecka
Summary: This study presents the feasibility of synthesizing functionalized poly(3-hydroxybutanoic acid) analogues and its copolymers via ring-opening polymerization of beta-butyrolactone mediated by activated anionic initiators. Polyesters with defined chemical structures of end groups, block, graft, and random copolymers were obtained and characterized using modern instrumental techniques, with a focus on ESI-MS. The relationship between the structure and properties of the prepared polymeric materials was also discussed.
Review
Biochemistry & Molecular Biology
Francisco G. Cirujano, Rafael Luque, Amarajothi Dhakshinamoorthy
Summary: Metal-organic frameworks (MOFs) have become versatile solid materials used in various applications like gas storage, separation, sensors, and catalysis. This review focuses on the use of MOFs as solid catalysts for the Henry reaction, discussing their structural properties and active sites. Comparisons with other solid catalysts in terms of activity and structural stability are made, along with suggestions for future directions in this field.
Review
Chemistry, Physical
Xiaofei Zhang, Jianyu Han, Jun Guo, Zhiyong Tang
Summary: Various synthetic methods have been successfully used to prepare nanoscale MOFs, which can improve the utilization of catalytic sites. Despite the rich selection of metal centers and organic molecules in MOFs, challenges exist in their stability under harsh reaction conditions. Efforts have been made to optimize catalytic performance by tuning the chemical environment of active sites in nanoscale MOFs.
Article
Polymer Science
Rawan Omar, Muneer Shaik, Chloe Griggs, Jevin D. Jensen, Robert Boyd, Nuri Oncel, Dean C. Webster, Guodong Du
Summary: This study successfully synthesized a series of star-shaped poly (beta-hydroxybutyrates) (PHBs) through ring-opening polymerization of cyclic esters using multifunctional initiators, and characterized their structure and properties through various techniques. The thermal properties of star-shaped PHBs can be modified by changing the arm number and arm length, while the wetting behavior of star-shaped PHBs is influenced by the number of arms.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Jinwei Zhang, Xiaopeng Li, Zheng Zhu, Tao Chang, Xiying Fu, Yongjing Hao, Xiaocai Meng, Balaji Panchal, Shenjun Qin
Summary: The study introduces a series of hydroxylamino-tethered polymeric ionic liquids with adjustable alkyl length substitutes, which efficiently and stably convert CO2 into cyclic carbonates without the need for metals and solvents.
ADVANCED SUSTAINABLE SYSTEMS
(2021)
Article
Chemistry, Inorganic & Nuclear
Pooja Rana, Bhawna Kaushik, Rashmi Gaur, Sriparna Dutta, Sneha Yadav, Kanika Sotanki, Bhavya Arora, Ankush Biradar, Manoj B. Gawande, R. K. Sharma
Summary: This work presents a noble metal free heterogeneous photocatalyst that enables direct functionalization of (het)arenes and solvent-free CO2 capture at room temperature and under pressure. The photocatalyst, based on Earth-abundant cobalt(iii), exhibits fascinating properties and shows high efficiency for selective conversions of aryldiazonium salts and carbon dioxide to valuable chemicals.
DALTON TRANSACTIONS
(2022)
Article
Polymer Science
Chihiro Maeda, Kenta Kawabata, Kaito Niki, Yuma Sako, Takumi Okihara, Tadashi Ema
Summary: In this study, bifunctional aluminum porphyrins catalyzed the terpolymerization of cyclohexene oxide, bis(CHO), and CO2 under solvent-free conditions, resulting in the formation of cross-linked polycarbonates (CLPs). The properties of CLPs, such as thermal stability and tensile strength, could be modified by changing the structure and amount of the cross-linking agent. Additionally, the selective cleavage of the cross-links in CLPs was achieved by UV light irradiation, leading to the formation of linear poly(cyclohexene carbonate)s (PCHCs).
Article
Chemistry, Multidisciplinary
Samuel E. Griffin, Grant P. Domecus, Clarissa E. Flores, R. Eric Sikma, Lauren Benz, Seth M. Cohen
Summary: Low-valent metal-organic frameworks (LVMOFs) and related materials have potential applications in heterogeneous catalysis, but no catalytic activity has been observed in the reported LVMOFs. In this study, a low-valent metal-organic material constructed from phosphine linkers and Ir-I nodes is reported. This material, similar to Vaska's complex, can reversibly bind O-2 and catalyze the reductive formation of enamines from amides.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Yi-xin Wang, Jing-hui Zhou, Jun Xiong, Wan-qi Huang, Quan Li, Xue Min, Ming Li
Summary: Two novel metal phosphonate networks based on zoledronic acid were successfully prepared and used as efficient catalysts for the conversion of CO2 gas to cyclic carbonates. The active centers of the catalyst were identified as Lewis acid sites and Bronsted acid sites in the compound structure. Furthermore, the catalyst exhibited good recyclability.
Article
Green & Sustainable Science & Technology
Shiva Prasad Gouda, Kanokwan Ngaosuwan, Suttichai Assabumrungrat, Manickam Selvaraj, Gopinath Halder, Samuel Lalthazuala Rokhum
Summary: Room temperature sulfonated UiO-66 exhibited excellent catalytic performance in converting oleic acid to methyl oleate under microwave irradiation. The catalyst, with high sulfonic acid density and surface area, achieved high conversion rates by optimizing reaction conditions. The catalyst and product were thoroughly characterized, and the catalyst's reusability was also investigated.
Article
Nanoscience & Nanotechnology
Chidharth Krishnaraj, Himanshu Sekhar Jena, Kuber Singh Rawat, Johannes Schmidt, Karen Leus, Veronique Van Speybroeck, Pascal Van Der Voort
Summary: This study synthesized and compared the performance of 2D imine COFs as catalysts, finding that Pd@TTA-DFB COF exhibited fast reactivity but low stability, Pd@TTA-DFP COF had the highest stability but slowest reactivity, and Pd@TTA-TBD COF showed the best overall performance. Experimental and computational results indicated that the reduction from Pd(II) to Pd(0) is a key step in determining the catalytic activity of COFs.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Sudakar Padmanaban, Minog Kim, Sungho Yoon
SCIENTIFIC REPORTS
(2017)
Article
Chemistry, Multidisciplinary
Seong-Gu Han, Seung-Il Baek, Won-Kyu Lee, Padmanaban Sudakar, Yeon Gyu Yu
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2017)
Article
Chemistry, Organic
Sangaraiah Nagarajan, Poovan Shanmugavelan, Murugan Sathishkumar, Namachivayam Priyadharshini, Padmanaban Sudakar, Alagusundaram Ponnuswamy
SYNTHETIC COMMUNICATIONS
(2013)
Article
Chemistry, Multidisciplinary
Sudakar Padmanaban, Minog Kim, Sungho Yoon
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2019)
Article
Chemistry, Multidisciplinary
Sudakar Padmanaban, Gunniya Hariyanandam Gunasekar, Mearae Lee, Sungho Yoon
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2019)
Article
Chemistry, Physical
Sudakar Padmanaban, Siyoung Yoon
Article
Chemistry, Multidisciplinary
Gunniya Hariyanandam Gunasekar, Sudakar Padmanaban, Kwangho Park, Kwang-Deog Jung, Sungho Yoon
Article
Chemistry, Inorganic & Nuclear
Sudakar Padmanaban, Jianwei Jiang, Siyoung Yoon
Article
Chemistry, Physical
Kwangho Park, Sudakar Padmanaban, Seong-Hoon Kim, Kwang-Deog Jung, Sungho Yoon
Summary: A novel porous organic polymer incorporating NNN pincer ligands has been prepared and characterized. A ruthenium molecular catalyst immobilized on the polymer support shows excellent catalytic performance for the hydrogenation of LA to GVL, with high selectivity and durability.
Article
Chemistry, Inorganic & Nuclear
Sudakar Padmanaban, Gunniya Hariyanandam Gunasekar, Sungho Yoon
Summary: In this study, a heterogeneous, pincer-type Ru porous organometallic polymer (Ru-Macho-POMP) with a high surface area was prepared via direct heterogenization of a commercially available homogeneous pincer-type complex, Ru-Macho, using dichloromethane as the cross-linker through a Lewis acid-catalyzed Friedel-Crafts reaction. The Ru-Macho-POMP catalyst demonstrated high turnover frequency (TOF = 920 h(-1)), high turnover number (TON = 2750), high chemoselectivity (99%), and recyclability during the selective hydrogenation of alpha, beta-unsaturated carbonyl compounds.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Sudakar Padmanaban, Yunho Lee, Sungho Yoon
Summary: In this study, a Ru-immobilized bisphosphine-based porous organic polymer (Ru@PP-POP) was used as an efficient heterogeneous catalyst for the chemoselective hydrogenation of cinnamaldehyde to cinnamyl alcohol with high chemoselectivity (98%) and excellent recyclability. The catalyst showed a high turnover number (970) and a high turnover frequency (240h^-1), representing the best activity obtained using a phosphine-based heterogeneous Ru-catalyst in this transformation.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Sudakar Padmanaban, Vinothkumar Ganesan, Sungho Yoon, Yunho Lee
Summary: In this study, a phen-based heterogeneous Pd catalyst, Pd@phen-POP, was synthesized for the reductive carbonylation of nitroarenes. The catalyst showed efficient catalytic activity, high selectivity, and recyclability.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Sudakar Padmanaban, Jonghoon Choi, Hugo Vazquez-Lima, Donghwi Ko, Dagyum Yoo, Jinseong Gwak, Kyung-Bin Cho, Yunho Lee
Summary: This study presents a synthetic approach to the conversion of NOx utilizing a bifunctional metal catalyst, which effectively converts Ni-NOx to Ni-NO and transfers the nitroso group to organic substrates. The successful catalytic production of oximes from benzyl halides using NaNO2 as a substrate is achieved under mild conditions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Gunniya Hariyanandam Gunasekar, Hongjin Park, Sudakar Padmanaban, Sungho Yoon
