Article
Chemistry, Organic
Wataru Ishiga, Masaya Ohta, Takuya Kodama, Mamoru Tobisu
Summary: This study demonstrates a catalytic ortho to para transposition of a silyl group in aniline derivatives using [RuCl2(p-cymene)](2)/BINAP in conjunction with a Cu(OAc)(2) additive. The method is also effective in isomerizing 2-silylpyrrole derivatives to their corresponding 3-silyl isomers.
Article
Chemistry, Multidisciplinary
Yuecheng Zhang, Jie Zhang, Lingbo Sun, Rui Tian, Hongyan Ma
Summary: In this work, a simple and time-saving ratiometric fluorescent approach for PPF determination was developed using dual emissive carbon dots (DECDs) as a probe. The fluorescence signal ratio (F-420/F-340) linearly changed with the concentration of PPF, allowing for the successful analysis of PPF content in commercial tablets and complex biological samples.
Article
Chemistry, Physical
Abdussalam K. Qaroush, Ala'a F. Eftaiha, Feda'a M. Al-Qaisi, Khaleel I. Assaf, Suhad B. Hammad, Malak H. Al-Anati, Enas S. Radwan, Firas F. Awwadi
Summary: This study presents a novel one pot synthesis method for 1,3-bis(3-(1,3-dioxoisoindolin-2-yl)propyl)-1H-imidazol-3-ium bromide (7), which serves as a crucial precursor for the synthesis of highly pure task specific ionic liquids (TSILs) and other derivatives. The effect of catalyst decoration, including the protic vs. aprotic phthalimide effect and peripheral length, was extensively investigated. Single crystal X-ray diffraction (XRD) was used to verify the chemical structure of the ammonium-based precursor. The overall activity of homogeneous imidazolium-based catalytic systems for cyclic carbonate (CC) production was explored, achieving almost quantitative conversions with TSIL 3 at 90 degrees C and 1 bar of CO2.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Biochemical Research Methods
Mengyuan He, Bo Zheng, Yuanhang Wei, Yu Xiao, Lixin Kou, Ning Shang
Summary: Dual-emissive fluorescent carbon dots (CDs) were prepared through the solvothermal method and exhibited two emission peaks at 465 nm and 630 nm. A ratiometric fluorescence sensor for Hg2+ detection was developed based on the selective quenching of fluorescence at 630 nm. The sensor showed a linear detection range of 0.5-40 μM and a detection limit of 37 nM. Furthermore, Hg2+ detection test paper was fabricated using the dual-emissive CDs, enabling qualitative and quantitative detection of Hg2+.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Samin Naghash-Hamed, Nasser Arsalani, Seyed Borhan Mousavi
Summary: In this study, a novel magnetic nanocomposite containing copper ferrite and gelatin-derived carbon quantum dots was synthesized and showed excellent catalytic performance in the reduction of highly toxic contaminants PNA and ONA. The nanocatalyst could be easily separated and recycled without significant loss of catalytic activity.
Article
Energy & Fuels
Krishnan Ravi, Ankush Biradar
Summary: This study reports the scalable synthesis of SO3H functionalized carbon from sugar industry waste and the detailed structural characterization and activity. The synthesized carbon catalyst exhibits high acidity and stability, making it efficient for various reactions including acetalization, alkylation, and alcoholysis. Furthermore, the SO3H functionalized carbon shows excellent selectivity and yield in solvent-free reactions.
Article
Chemistry, Multidisciplinary
Orhan Altan
Summary: The effects of g-CN synthesized from different precursors on the photocatalytic efficiency of Schottky junctions were investigated, revealing that the charge transfer dynamics of surface defects are more critical for the photocatalytic performance of Schottky junctions than structural features such as the size of metal nanoparticles or the surface area of the catalysts.
TURKISH JOURNAL OF CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Rustem H. Bagramov, Vladimir P. Filonenko, Igor P. Zibrov, Elena A. Skryleva, Alexander V. Nikolaev, Dmitrii G. Pasternak, Igor I. Vlasov
Summary: The high-pressure synthesis of boron-doped diamonds and graphite from boron-containing organics has shown to be effective, with boron promoting the synthesis of diamond under high pressure. Under high pressure, boron-doped diamond and graphite can be synthesized from different mixtures of organic materials.
Article
Chemistry, Multidisciplinary
Abdul Selim, Raina Sharma, Senthil Murugan Arumugam, Sasikumar Elumalai, Govindasamy Jayamurugan
Summary: In this study, the efficacy of Bronsted acid-functionalized cyclodextrins (CDs) in the preparation of energy fuel building-block compounds (5-hydroxymethylfurfural and ethyl levulinate) was reported. CD-SO3H was prepared using cheap p-toluenesulphonic acid as a precursor through a simple and scalable protocol. The catalyst exhibited higher acid density and minimum particle size characteristics, as confirmed by high-end analytical techniques. It showed high conversion yields for glucose dehydration into 5-hydroxymethylfurfural (82 mol%) and levulinic acid esterification into ethyl levulinate (85 mol%) under modest reaction conditions. The catalyst also facilitated the synthesis of other alkyl levulinates with similar yields. Moreover, it demonstrated good recyclability, with the ability to be reused for multiple cycles. Overall, this catalytic setup represents an environmentally-friendly and feasible method for process development.
Article
Thermodynamics
Yang Zeng, Tu Lan, Min Li, Guoyuan Yuan, Feize Li, Jiali Liao, Jijun Yang, Yuanyou Yang, Ning Liu
Summary: A study comparing the effectiveness of ortho-, meta-, and para-substituted pyridine Schiff bases on zirconium-based metal-organic frameworks (MOFs) for removing cobalt ions from aqueous solutions found that the ortho-substituted MOF had the highest adsorption capacity and demonstrated superior regenerability. The research also revealed the adsorption mechanism and provided insights for designing effective functionalized MOFs for heavy metal and radionuclide removal.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Materials Science, Multidisciplinary
Maysa L. Nascimento, ArthurS. Alves, Jose A. M. Nascimento, Vagner B. Santos, Severino Carlos B. Oliveira
Summary: The anodic behavior of different isomers of tyrosine and phenylalanine in aqueous support electrolytes was studied using cyclic and differential pulse voltammetry. The results showed that all tyrosines undergo oxidation at the phenolic group, forming an intermediate radical. The reactivity of this radical is influenced by its position in the tyrosine structure. The electrochemical behavior of 3-chloro-tyrosine was also studied, and it exhibited similar oxidation behavior to tyrosine with a pH-dependent cathodic peak.