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Alkali Metal Dihydropyridinates: From Hidden Intermediates to Promising Well-defined Catalysts?
Full text linkOften the synthesis of catalysts can be time-consuming, multistep tasks, but sometimes they can turn up fortuitously, hidden treasure finds in essence. The alkali metal dihydropyridinate complexes discussed here fit the latter scenario. First reported simply as in situ intermediates by reaction of two commercially available reagents, an alkyllithium and pyridine, a whole class of such compounds, isolated and structurally characterised are now known where M = Li, Na, K, Rb and Cs. Here, some of their recent applications in homogeneous catalysis are outlined, including dehydrocoupling of aminoboranes, hydroboration of aldehydes and ketones, dehydrocyclization of diamine boranes, and transfer hydrogenation of alkenes to alkanes
Tailored Compound Specific Carbon Isotopes Analysis in Heritage Science
Full text linkRadiocarbon dating has long been a cornerstone of archaeological science, offering a reliable method to determine the age of organic materials. Yet when applied to cultural heritage objects, traditional bulk analysis methods often fall short. Our research, supported by an SNSF Ambizione program, seeks to overcome these limitations by shifting the focus from bulk materials to individual molecules. We aim to untangle the mixed carbon sources encountered in heritage materials through compound specific approaches and further target the color of an object, i.e. natural organic dyes and pigments. This perspective opens new avenues for understanding the chronology, provenance, and material history of cultural heritage objects. The implementation of compound specific radiocarbon analysis (CSRA) and compound specific isotopic analysis (CSIA) in heritage science demands not only analytical precision but also an uncompromising approach to exogenous carbon contamination control. Herein, we describe our current efforts in developing color specific carbon isotopic analyses that address this challenge
10 Years of The Hague Ethical Guidelines - A Testament to Ethical Use of Chemistry and International Cooperation
Full text linkTransition Metal Complexes with N-Heterocyclic Vinylidene Ligands
Full text linkTransition metal complexes with N-heterocyclic vinylidene ligands can be obtained by combining N-heterocyclic diazoolefins with suitable metal precursors. The vinylidene ligands can act as potent C-donor ligands, allowing for the stabilization of electron-deficient and low-coordinate metal complexes
The 2025 Meet & Greet Event with Alfred Werner Scholars at the Syngenta Stein Crop Protection Research & Development Center
Full text linkExtending Resonant Inelastic X-ray Scattering to Extreme Ultraviolet
Full text linkWe present α-Al2O3 XAS, XES and RIXS measurements across the Al L2/L3 edges at about 79 eV excitation energy. In the emission spectra, we identify two fluorescence peaks, corresponding to electronic transitions into the 2p core hole from mixed states of Al 3s and Al 3d character, both mixed with O 2p orbitals. Even if the XAS spectrum shows more than one resonance, surprisingly only one clear RIXS signal with energy loss equal to 10.7 eV is present in the data. Nevertheless, this allows us to tentatively extract from the measured high-resolution data the linewidths for fluorescence and RIXS transitions, with the latter being almost a factor of two smaller than the former
Unlocking the Potential of Browser- Based Scientific Data Analysis: A 20-Year Journey of Expertise
Full text linkThe browser has become an indispensable tool for a variety of everyday tasks, yet its potential in scientific data processing remains underexplored and is often perceived as slow. This paper presents four examples of advanced web applications that we have developed during the last 20 years and demonstrates the browser’s ability to compete with traditionally installed software. These applications were made possible through the development of over 100 open-source libraries, extending the FAIR (Findable, Accessible, Interoperable, and Reusable) principles to include not only data but also software
Modular Development of Plasma-Source Ultra-High-Resolution Mass Spectrometry with Constitutional Isotopic Information: Highlights of Analytical Sciences in Switzerland
No full textWANTED: Flow Chemistry Reaction Data
Full text linkFlow reaction data could have an outsized impact in the datasets which train the reaction prediction, chemical synthesis planning, and experiment design tools of tomorrow. This paper discusses why we should be increasing the availability of flow reaction data, and presents the Open Reaction Database as a schema and repository for such data. Best practices for defining flow reactions in the schema are discussed, highlighting those parts of the schema which are particularly relevant to flow reactions. Telescoped flow processes, and transient flow conditions are more complex to define in the schema, but options are presented for several typical scenarios. The paper concludes by opening a conversation with the flow chemistry community about how they would prefer to search for flow reaction data, and how to archive their own reaction data