Article
Chemistry, Physical
Viacheslav A. Kuropatov, Konstantin S. Nikitin, Georgy L. Pakhomov, Sergey V. Norkov, Margarita P. Shurygina, Alexandr V. Kazak, Vladimir K. Cherkasov
Summary: In this work, a novel bis-semiquinone complex of nickel and o-quinone annulated with a 1,3-dithiol-2-thiocarbonyl fragment is described, and the deposition of thin films of this compound on different substrates is investigated. It is found that the thin film can maintain the crystal structure of the original complex. A photovoltaic effect is observed in sandwich structures with an aluminum cathode. Further optimization of the structure of sulfur-rich molecules is expected to yield solid-state ensembles with promising photovoltaic and/or photodetecting properties.
SURFACES AND INTERFACES
(2023)
Article
Agronomy
Miroslaw Kobierski, Magdalena Banach-Szott
Summary: This study aimed to determine the relationship between the organic matter properties of Fluvisols (arable soil and grassland) and nearby riverbank sediments, and found that the properties of organic matter in Fluvisols are influenced by the quantity and quality of organic matter transported in suspended matter during flood events in flood valleys. The current land-use type significantly impacted the properties of organic matter in Fluvisols.
Article
Chemistry, Applied
Guan-Nan Li, Hao-Cong Li, Meng-Ru Wang, Zhan Lu, Bing Yu
Summary: A visible-light-induced acylation aromatization reaction of para-quinone methides to access alpha,alpha'-diarylated ketones using cheap and readily available carboxylic acids as acylating reagents via deoxygenation was developed. The method offers a simple and efficient approach to synthesis and shows a broad substrate scope, allowing for late-stage functionalization of drug molecules.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Engineering, Environmental
Garrett McKay
Summary: This study demonstrates that autoxidized hydroquinone can replicate the optical properties of DOM, supporting the charge-transfer model for DOM photophysical processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Han-Gook Cho, Lester S. Andrews
Summary: Reactions of group 11 metals with cyanogen were studied with experiments and calculations, revealing the energetically favorable formation of metal cyanides and isocyanides in the lightest metal system. Spectral variations and calculations provided insights into reaction pathways and products.
INORGANIC CHEMISTRY
(2021)
Article
Microbiology
Jixing Wan, Kezhen Chen, Jingwen Chen, Zhihui Qin, Lorenz Adrian, Chaofeng Shen
Summary: Perchloroethene (PCE) is a toxic chlorinated solvent widely used around the world. Certain strains of Dehalococcoides mccartyi can transform PCE to ethene, aiding in the bioremediation of contaminated sites. In this study, the researchers observed that the presence of humic acids (HA) accelerated the dechlorination of PCE in mixed cultures containing Dehalococcoides strains. On the other hand, anthraquinone-2,6-disulfonic acid (AQDS), an analogue of HA, inhibited PCE dechlorination. The researchers concluded that HA enhanced PCE dechlorination by increasing the reaction speed between hydrogen and the dehalogenase enzyme.
FEMS MICROBIOLOGY ECOLOGY
(2022)
Article
Environmental Sciences
Justyna Michalska, Jolanta Turek-Szytow, Agnieszka Dudlo, Katarzyna Kowalska, Joanna Surmacz-Gorska
Summary: Although humic substances (HSs) are valuable in the environment, they can be nuisances for wastewater treatment plants (WWTPs). This study evaluated analytical methods for determining the structure, properties, and utilization of HSs from WWTPs. UV-Vis spectroscopy was found to be a cost-effective method for preliminary characterization, while X-EDS and FTIR were recommended for in-depth analysis due to their ability to detect heavy metals and biogenic elements. Certain absorbance coefficients and fluorescence capacities were identified as useful indicators.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biochemistry & Molecular Biology
Dominik Niewes, Marta Huculak-Maczka, Magdalena Braun-Giwerska, Kinga Marecka, Aleksandra Tyc, Marcin Biegun, Krystyna Hoffmann, Jozef Hoffmann
Summary: This study presents the results of extracting humic substances (HSs) from peat using traditional alkaline extraction (TAE) and ultrasound-assisted alkaline extraction (UAAE). The duration of the process and ultrasound intensity were found to affect the extraction efficiency of humic acids (HAs) and fulvic acids (FAs). The quality of specific fulvic acids fractions was assessed using spectroscopic methods. Ultrasound had a positive effect on HS extraction efficiency, but excessive prolongation and ultrasound intensity negatively affected the extraction efficiency of specific fulvic acid fractions.
Article
Chemistry, Physical
Huseyin Karaca, Sozcan Kazanci
Summary: In this study, three different chalcone compounds were successfully synthesized and characterized using various analytical techniques. The interaction between these synthesized chalcones and metal ions was investigated, showing that selective detection of metal ions is possible using molecularly modified chalcones in the solution. These findings provide valuable insights for future development of metal ion detection methods.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Multidisciplinary Sciences
Connor J. Clarke, Jemma A. Gibbard, Lewis Hutton, Jan R. R. Verlet, Basile F. E. Curchod
Summary: This study presents a detailed investigation of the photochemistry of isolated pyruvate anions. It reveals that the photoexcitation of pyruvate anions by UVA light leads to the formation of CO2, CO, and CH3-, which may have significant consequences for atmospheric chemistry.
NATURE COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Megan C. C. Davis, Xinchuan Huang, Ryan C. C. Fortenberry
Summary: This study explores new high-level ab initio quartic force field (QFF) methods that provide spectroscopic data for the electronically excited states of carbon monoxide, water, and formaldehyde cations, which are important in cometary spectral analysis. The QFFs based on equation-of-motion ionization potential (EOM-IP) achieve accurate assignments for the vibrational frequencies of the excited states of the formaldehyde cation. The study also proposes re-assignments for the vibrational frequencies of the water cation based on computational results.
Article
Chemistry, Physical
Joseph Grondin, Christian Aupetit, Jean-Marc Vincent, Raphael Mereau, Thierry Tassaing
Summary: The visible light promoted perfluoroalkylation reactions involving halogen bonding interactions have been recognized as a powerful tool in radical synthetic chemistry. Studies showed that the halogen-bonded complexes are the main species present in solution during perfluoroalkylation reactions, with UV-Vis spectroscopy revealing a significant increase in absorption from 225 to 350 nm, proportional to the basicity of the Lewis base.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Environmental
Fahim Amini Tapouk, Seperhr Padervand, Kamyar Yaghmaeian, Mirzaman Zamanzadeh, Somayeh Yousefi, Samaneh Abolli, Hamed Soleimani, Mahmood Alimohammadi
Summary: Humic acids are natural organic substances that are precursors of disinfectant by-products. New nanocomposites were synthesized for photocatalytic degradation of humic acid. The removal efficiency was optimized through central composite design, showing potential for use in water treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Hengcan Dai, Xiaoliang Yang, Fei Tang
Summary: A three-dimensional flower-shaped Bi2WO6 and Ag2S-Bi2WO6 composite were prepared by hydrothermal methods. The properties and photocatalytic performance of the composite were characterized, and the effects of initial solution pH and organic compound concentration on degradation efficiency were studied. The degradation pathway was speculated based on free radical capture experiments and semiconductor theory.
Article
Environmental Sciences
Zhihan Tan, Hongxiang Zhu, Xiaosong He, Beidou Xi, Yuxin Tian, Xiaojie Sun, Hongxia Zhang, Quanyi Ouche
Summary: This study analyzed the effects of different ventilation quantities on the electron transfer capacity and spectral characteristics of humic substances (HSs) during sludge composting. The results showed that moderate ventilation can enhance the electron transfer capacity and electron recycling rate of HS, promoting the decomposition of contaminants.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)