Article
Chemistry, Multidisciplinary
Luis I. Domenianni, Markus Bauer, Till Schmidt-Raentsch, Joerg Lindner, Sven Schneider, Peter Voehringer
Summary: Transition-metal nitrides/nitrenes are promising reagents for catalytic nitrogen-atom-transfer reactions. They are prepared in situ via optically induced N-2 elimination from azido precursors. This study elucidates the primary molecular-level mechanisms responsible for the formation of a unique platinum(II) nitrene with a triplet ground state from a closed-shell platinum(II) azide precursor.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Optics
Svilen Sabchevski, Mikhail Glyavin
Summary: Nowadays, gyrotrons are widely used in various fields including plasma heating and nuclear fusion, as well as material treatment and advanced spectroscopic techniques. The unique spectral properties of gyrotron radiation and its controllable output power and frequency make it an attractive radiation source. This review paper discusses the current status and recent achievements of gyrotron-based spectroscopy systems, as well as the trends in developing dedicated radiation sources operating in the THz frequency range.
Article
Chemistry, Multidisciplinary
Christoph Helling, Cameron Jones
Summary: The influence of aryl substituents on the Schlenk-type equilibria of arylberyllium bromides was systematically studied, and the structures of the complexes were characterized using spectroscopic methods and X-ray diffraction. The study provides insights into the steric effects of aryl groups on the reactivity and selectivity of the complexes.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Pharmacology & Pharmacy
Istvan Timari, Sara Balla, Krisztina Feher, Katalin E. Koever, Laszlo Szilagyi
Summary: Investigating the interactions between ligands and proteins is crucial for understanding biological processes. The recognition of glycans by lectins is particularly important in diseases like cancer, and inhibiting these interactions could lead to new therapeutics for controlling cancer development. Recent advances in Se-77 NMR spectroscopy have allowed for more sensitive monitoring of the binding of selenoglycosides to galectins. This opens up possibilities for using isotopically enriched selenoglycans for rapid monitoring of lectin-binding and ligand screening.
Article
Plant Sciences
Abdul Latif Khan, Ahmed Al-Harrasi, Muhammad Numan, Noor Mazin AbdulKareem, Fazal Mabood, Ahmed Al-Rawahi
Summary: This study used robust infrared and nuclear magnetic resonance spectroscopy methods coupled with chemometric analysis to identify sex differentiation in immature date palm leaves. The signals of monosaccharides and/or disaccharides were found to play key roles in sex differentiation, and sex-specific genes and molecular markers were identified to enhance transcript accumulation in females compared to males, providing an alternative tool for sex differentiation in date palm trees.
Article
Construction & Building Technology
Stefan Werkovits, Markus Bacher, Johannes Theiner, Thomas Rosenau, Hinrich Grothe
Summary: In this study, the structural and chemical characteristics of bitumen and its fractions were analyzed using various spectroscopy techniques. The results revealed the molecular changes and differences among the fractions, providing new insights into bitumen structure and chemistry.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Khalid I. Doudin
Summary: Biodiesel is a renewable, biodegradable, non-toxic fuel typically produced from vegetable oil and animal fat. NMR spectroscopic methods are utilized to investigate the molecular compositions of biodiesel samples, evaluate the transesterification process, and quantify methanol in biodiesel as an alternative to traditional methods.
Article
Chemistry, Physical
Trent R. Graham, Brandy N. Gartman, Anjelica Bautista, Lindsay E. I. Irwin, Eden J. Shelby, Danielle L. Saunders, Timothy J. Johnson, Mark K. Murphy, Nicolas Uhnak, Andrew M. Ritzmann, James M. Bowen
Summary: This study explores the sensitivity and limitations of various spectroscopic techniques in detecting changes in iodine speciation. The results show that commonly used spectroscopies have different sensitivities to various iodine species. Through the analysis of Raman, FTIR, and NMR spectra, high-resolution autocorrelation spectra are generated to track the acidification-induced and gamma irradiation-induced transformations of iodine. This research provides insights for designing optimal combinations of techniques to detect different forms of iodine.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Henning Windeck, Fabian Berger, Joachim Sauer
Summary: The location of Bronsted-acid sites at different crystallographic positions of zeolite catalysts influences their reactivity. By selecting the most stable conformers, it is found that the strength of internal H-bonds and the OH bond length vary substantially with the framework position. The experimental results support the previously debated assignments of H-bonded b-OH sites.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Maximilian Benz, Thomas M. Klapoetke, Tobias Lenz, Joerg Stierstorfer
Summary: This study investigates the sensitivities and properties of derivatives of 5-azido and 5-nitraminotetrazole compounds through functionalization with different groups. Extensive characterizations and tests were conducted on the obtained products.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Christoph Kubis, Matthias Koenig, Benedict N. Leidecker, Detlef Selent, Henning Schroeder, Mathias Sawall, Wolfgang Baumann, Anke Spannenberg, Alexander Braecher, Klaus Neymeyr, Robert Franke, Armin Boerner
Summary: Results of a detailed study on a monophosphite-modified rhodium catalyst system using in situ IR and NMR spectroscopy are presented. Equilibria between active hydrido rhodium(I) complexes and inactive dinuclear rhodium(0) complexes, as well as mononuclear ortho-metalated rhodium(I) complexes, have been investigated. Dimer formation dominates at lower temperatures and higher rhodium concentrations, while ligand metalation is more effective at higher temperatures. Regeneration of hydrido rhodium(I) complexes occurs rapidly from both states at appropriate hydrogen partial pressures, and temporary stabilization of the catalyst through ligand metalation during recycling is a feasible approach.
Article
Biochemistry & Molecular Biology
Sandra Magalhaes, Idalia Almeida, Catia D. Pereira, Sandra Rebelo, Brian J. Goodfellow, Alexandra Nunes
Summary: Aging is a complex process that leads to the progressive loss of fitness and increased susceptibility to disease and death. This study used human fibroblasts as a model to characterize the metabolic profile associated with cell senescence using spectroscopy techniques. The results showed significant changes in the spectroscopic profile of cells over time, including alterations in lipid composition and increased protein aggregation levels.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Polymer Science
Svetlana R. Derkach, Nikolay G. Voron'ko, Yulia A. Kuchina
Summary: This review summarizes recent advances in the study of polysaccharide-gelatin complexes, focusing on data obtained by spectroscopic methods. The discussion highlights the complexing polysaccharides of marine origin, such as sodium alginate, kappa-carrageenan, and chitosan. The prospects for creating polysaccharide-gelatin complexes with desired physicochemical properties are outlined.
Article
Spectroscopy
Polina Skvortsova, Yuliya Valiullina, Natalia Baranova, Dzhigangir Faizullin, Yuriy Zuev, Elena Ermakova
Summary: Amphibians are a natural source of a variety of peptides with functional activities, which can be characterized using a complex of spectroscopic methods. The structure and functional activity of megin-1, a peptide isolated from amphibian skin, were studied using NMR, FTIR, CD, and UV-spectroscopy. Thermodynamic characteristics of peptide transformation and its antibacterial, antimycotic, and protease inhibitory activities were analyzed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Review
Virology
Alaa Bedair, Kamal Okasha, Fotouh R. Mansour
Summary: The coronavirus pandemic is a global threat, and spectroscopic techniques play a crucial role in the early detection and diagnosis of COVID-19.