Article
Chemistry, Multidisciplinary
Lars Rummel, Marvin H. J. Domanski, Heike Hausmann, Jonathan Becker, Peter R. Schreiner
Summary: This study investigates the conformers of N,N'-diphenylthiourea and finds that intramolecular noncovalent interactions favor the folded syn-syn conformer. The preference for syn-syn conformers is influenced by London dispersion, and this finding sheds light on why thiourea derivatives may be poor catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Green & Sustainable Science & Technology
Runzhou Huang, Zhuangzhuang Teng, Shuang Li
Summary: Dynamic thermogravimetric analysis was used to investigate the thermal decomposition of heartwood and sapwood in eight wood species. The activation energy of the heartwood and sapwood was calculated using various model-free methods, and the infrared spectrograms showed that heartwood requires more energy for chemical reactions. Softwood had a higher activation energy than hardwood.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Multidisciplinary
Julia R. Dorsheimer, Melissa A. Ashley, Tomislav Rovis
Summary: This study reports a new method to activate alpha-3 degrees amines for deaminative arylation by condensing with an electron-rich aldehyde and combining this reactivity with nickel metallaphotoredox to generate benzylic quaternary centers. The reaction is accelerated by added ammonium salts, which inhibit nickel black formation and accelerate the overall reaction rate. The study demonstrates a broad scope of coupling partners and shows an expedited synthesis of ALK2 inhibitors.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Sani Kundu, Manisha Chakraborty, Ashis Bhattacharjee
Summary: This article investigates the thermal decomposition of ferrocene in the presence of oxalic acid dihydrate in oxidative and inert atmospheres. The experimental results show that hematite and cohenite nanomaterials can be synthesized through the thermal decomposition of a mixture of ferrocene and oxalic acid dihydrate in O-2 and N-2 atmospheres, respectively. The reaction steps involved in these decompositions are complex and can be separated using a peak deconvolution method. The kinetic and thermodynamic parameters are estimated, and the effect of the reaction atmosphere on the thermal decomposition process of ferrocene is realized.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Energy & Fuels
Sergey Vyazovkin, Nikita Muravyev
Summary: Many publications in Biomass Conversion and Biorefinery have recently addressed the use of single heating rate methods in pyrolysis data analysis, highlighting their limitations in determining reliable kinetic parameters. The reasons and examples of the failure are briefly discussed and emphasized. The International Confederation for Thermal Analysis and Calorimetry recommends the use of methods employing multiple heating rates for accurate kinetic analyses.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Biochemistry & Molecular Biology
Alireza Foroughnia, Aliakbar Dehno Khalaji, Eskandar Kolvari, Nadiya Koukabi
Summary: A new chitosan Schiff base and its nanocomposite were synthesized and characterized, showing excellent efficiency in methyl orange removal and antibacterial activities. The presence of iron oxide nanoparticles in the nanocomposite may have contributed to its unique properties.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Review
Chemistry, Multidisciplinary
Mengqi Li, Wei-Hong Zhu
Summary: Photochromic diarylethenes with reversible regulation by external light irradiation have important applications in various fields. However, there are still unresolved issues regarding the modulation of bistability, reduction of photoinactive conformers, and achievement of reversible enantiospecific transformation. To address these issues, we developed a diarylethene system based on benzobis(thiadiazole) that successfully separated multiple conformers, resulting in higher photocyclization quantum yields and enantiospecific photoreactions.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Qiu-Qi Mu, Yi-Xue Nie, Hang Li, Xing-Feng Bai, Xue-Wei Liu, Zheng Xu, Li-Wen Xu
Summary: This study achieved highly enantioselective kinetic resolution of sterically hindered benzylamines for the first time through transition-metal-catalyzed oxidative carbonylation, providing a new approach to chiral isoindolinones (er up to 97:3). The origin of chemoselectivity and stereoselectivity was confirmed by density functional theory (DFT) calculations.
CHEMICAL COMMUNICATIONS
(2021)
Article
Thermodynamics
Xiaowen Yu, Chunhua Zhang, Hanwen Wang, Wen Wang, Chaoping Jiang, Chaolin Peng, Ke Yang
Summary: Coal-to-liquid (CTL) base oil, synthesized by Fischer-Tropsch process, has a good prospect for synthetic high-grade lube oil. The addition of diphenylamine (L57) and 2,6-di-tert-butyl-4-methylphenol (T501) can significantly improve the oxidation stability of CTL base oil. This study provides guidance for the application of CTL base oil in the high-grade lube oil market.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Bruna M. E. Chagas, Cintia C. Costa, Mariane B. Chagas, Sueilha A. F. Paula, Renata M. Braga, Marcus A. F. Melo, Emerson M. Aguiar, Jackson A. Oliveira, Jairo R. Souza, Carlos H. Ataide
Summary: Microalgae have the potential to produce biofuels, with mixotrophic cultivation using molasses as an organic carbon source offering a lower-cost option. The kinetics models used are effective in determining activation energy for different cultivation methods, and mixotrophic cultivation influences the volatile compounds produced by microalgae biomass.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Physical
Ibrahim Erol
Summary: Novel maleimide monomers were synthesized and characterized in this study. The structural properties, thermal stability, and biological activities of the resulting polymers were investigated. Furthermore, the molecular weights, photochemical properties, physical constants, and dielectric properties of the polymers were determined.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Review
Energy & Fuels
Rui-tang Guo, Gang-yue Li, Yu Liu, Wei-guo Pan
Summary: Excessive greenhouse gas emissions have led to various environmental problems, and the development of CO2 capture technologies is crucial. Recent research has focused on chemical absorption techniques using sterically hindered amines, which offer advantages such as large absorption capacity and reduced energy consumption for regeneration. This review summarizes the reaction mechanism and classification of sterically hindered amine absorbents, and evaluates the latest advancements in carbon dioxide sequestration using these absorbents.
Article
Chemistry, Physical
Michael D. Garrison, Shay Goff Wallace, Lawrence C. Baldwin, Zixuan Guo, Lidia Kuo, Joseph E. Estevez, Alejandro L. Briseno, Mark C. Hersam, Alfred J. Baca
Summary: Previous research has shown that graphene-coated ammonium perchlorate (AP) accelerates its decomposition kinetics, while hBN coating does not have a similar effect. Structural characterization including electron microscopy and X-ray diffraction were used to analyze the effects of AP crystal size and crystallinity. The accelerated decomposition kinetics of graphene-coated AP were quantified through thermogravimetric analysis, gas chromatography mass spectrometry, and kinetic modeling.
CHEMISTRY OF MATERIALS
(2021)
Article
Thermodynamics
Marcio R. O. Souza, Joao M. R. Silva, Marcio D. S. Araujo, Josue S. Almeida, Valter J. Fernandes, Ana C. F. Coriolano, Regina C. O. B. Delgado, Antonio S. Araujo
Summary: Bimodal silica and aluminosilicate materials with mesopores and macropores were synthesized using the hydrothermal method, showing efficiency in processing hydrocarbons present in heavy oil. These materials were evaluated for distillation and cracking of a petroleum sample, demonstrating their effectiveness in reducing activation energies for catalytic cracking.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Applied
Sergey Vyazovkin
Summary: This note highlights the issue of using single heating rate kinetics for thermal decomposition of organometallic compounds. It emphasizes that this approach leads to erroneous results and goes against the recommendations of the International Confederation for Thermal Analysis and Calorimetry. The paper advocates for the adoption of multiple heating rate approach and provides examples of its failure.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Polymer Science
Adnan Solmaz, Zulfiye Ilter, Ismet Kaya
Summary: In this study, a series of chalcone methacrylamide polymers were synthesized and characterized comprehensively for their structural and performance properties, including thermal behavior, electrical properties, and antimicrobial activities. The results demonstrated the potential applications of these polymers in various fields due to their unique properties.
Article
Polymer Science
Ismet Kaya, HaticeKaraer Yagmur
Summary: Aromatic compounds with hydroxyl and amine groups can be enzymatically or oxidatively polymerized to form oligomers or polymers, known as green chemistry. Poly(4-aminosalicylic acid) obtained through oxidative polymerization showed higher residual amount at 1000 degrees Celsius compared to ASA and PASA-E, indicating potential applications.
IRANIAN POLYMER JOURNAL
(2022)
Article
Chemistry, Applied
Ismet Kaya, Burcin Akyuz, Feyza Kolcu, Hakan Soyut
Summary: Schiff base polymers or poly(imine)s are a group of conjugate polymers with high thermal stability. Due to their stability, they are widely used in electronic equipment production. By condensation reactions and the addition of oxidant, Schiff base compounds and polynaphtol derivatives can be synthesized. These synthesized polymers show solvatochromism and bicolored fluorescent light emission properties, making them potential candidates for semiconductor applications.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Biochemical Research Methods
Digdem Erdener, Ismet Kaya
Summary: A new fluorescence probe L for selectively detecting Al3+ ions was synthesized and characterized. The probe's properties, such as the limit of detection and Ka constant, were determined using various spectroscopic techniques. The stoichiometric binding ratio of L-Al3+ was confirmed to be 2:1 and the recyclability of the chemosensor was demonstrated by adding EDTA to the L-Al3+ solution. The study highlights the potential of carbazole-based Schiff base as an effective chemosensor for Al3+ ions.
JOURNAL OF FLUORESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Ismet Kaya, Kevser Temizkan, Yeliz Kaya, Ayse Ercag
Summary: In this study, a family of azomethine-based thiocarbohydrazone monomers and polymers were synthesized and characterized using various techniques. The compounds exhibited different fluorescence and antioxidant activities, as determined through analyses of their electrochemical behaviors, fluorescent activities, thermal characteristics, and antioxidant effectiveness.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Feyza Kolcu, Ismet Kaya
Summary: A carbazole-based Schiff base chemosensor was synthesized for fluorescent sensing of Al3+ ions. The ligand exhibited fluorescence enhancement upon chelation with Al3+ ions, making it a potential probe for detecting Al3+ ions. The specificity of the ligand for Al3+ ions and its reversible complex formation with EDTA were also studied. The synthesized Schiff base showed efficient detection of Al3+ ions as a fluorescent sensor.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Polymer Science
Ismet Kaya, Semra Koca, Hatice Karaer Yagmur
Summary: Schiff bases and their conjugated oligo(azomethine)s were synthesized via condensation and oxidative polycondensation. The structures of polymers were confirmed and their electrochemical and thermal properties were studied. The electrical properties of monomers and oligomers were determined.
JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
(2022)
Article
Chemistry, Physical
Ismet Kaya, Semra Koca, Hatice Karaer Yagmur
Summary: Two Schiff bases, SB1 and SB2, were synthesized through a condensation reaction. The oxidative polycondenzation reaction conditions were determined for SB1 and SB2 using H2O2, NaOCl, and air oxidants at different temperatures and reaction times. The structural, electrochemical, and thermal properties of the compounds were characterized. It was found that SB2 exhibited better thermal stability, optical properties, and conductivity compared to SB1.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Polymer Science
Hakan Soyut, Feyza Kolcu, Ismet Kaya, Alper Omer Yasar
Summary: Semi-conductive polymers have been widely used in various applications such as coatings, accumulators, solar cells, rechargeable batteries, ion sensors, photoreceptors, light-emitting diodes and electrochromic instruments. Two types of polymers, Poly(TFMBDA)-O and Poly(TFMBDA)-E, were synthesized using different polymerization methods. The structures of the compounds were confirmed using FT-IR, UV-vis and H-1-NMR and C-13-NMR instruments. The polymers showed different properties in terms of molecular weight, glass temperature, and photoluminescence emission.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Polymer Science
Musa Kamaci, Ismet Kaya
Summary: In this study, biodegradable hybrid hydrogels were prepared for the drug delivery application of 5-fluorouracil. The results showed that the fabricated hydrogels exhibited good mechanical, hydrophilic, water uptake, and biodegradation behaviors, making them a promising candidate for the controlled delivery of 5-FU.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Polymer Science
Ismet Kaya, Burcin Akyuz, Sahin Ozel
Summary: The 8-((4-hydroxybenzylidene)amino)naphthalene-2-ol (ANAPSB) compound was synthesized through the condensation reaction of 8-amino-2-naphthol (ANAP) with 4-hydroxybenzaldehyde, and then polymerized with 8-amino-2-naphthol via oxidative polycondensation in an alkaline medium using H2O2 as an oxidant. The structures of the compounds were confirmed through various measurements, and their properties were analyzed. The results showed that PANAP and PANAPSB exhibited different thermal and optical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Feyza Kolcu, Sueleyman Culhaoglu, Ismet Kaya
Summary: A one-pot condensation reaction between 9,9-Bis(4-aminophenyl)fluorene and 9-Ethyl-9H-carbazole-3-carbalde-hyde resulted in the synthesis of a chemosensor, SB, which exhibited high sensitivity and selectivity towards Sn2+ ions. The chelation-enhanced fluorescence (CHEF) mechanism was responsible for the turn-on fluorescent recognition process of Sn2+ by restricting C=N isomerization and inhibiting intramolecular charge transfer (ICT). The synthesized SB-Sn2+ chelation showed a limit of detection value of 3.37 nM and demonstrated reversibility in the presence of chelating agent EDTA.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Polymer Science
Ismet Kaya, Ruhsar Ela Iris, Hatice Karaer Yagmur
Summary: In this study, a Schiff base, 2,4,6-tris(4-hydroxybenzimino)-1,3,5-triazine (HT), and its derivatives were synthesized and used as building blocks to prepare flame-resistant polymers. The resulting melamine and pentaerythritol-based polymers exhibited excellent flame retardancy.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Polymer Science
Alper Omer Yasar, Ismet Kaya
Summary: Chitosan/polypyrrole (Ks/PPy) nanoparticles were synthesized and embedded in a poly(acrylamide) (PAAm) hydrogel matrix. The PAAm-Ks/PPy hydrogels were treated with hydrochloric acid (HCl), resulting in an increase in electrical conductivity and adsorption performance.
Article
Polymer Science
Ismet Kaya, Emin Dincer, Hatice Karaer Yagmur
Summary: Schiff bases and poly(phenoxy-imine)s were synthesized and characterized in this study. P-SCH-2-A showed excellent performance in terms of LOI and optical band gap. The glass transition temperature and surface properties of the poly(phenoxy-imine)s were also determined.
