Trace and Minor Element Analysis of Azurite Blues in Fine Arts: Possibilities and Limitations in Provenance Studies

This study investigates azurite (and malachite) pigments from important European deposits with special focus on their trace elemental composition. Using advanced analytical techniques, researchers discovered that specific trace elements, such as rare earth elements or uranium, can be key indicators of pigment provenance. These findings were applied to historical artworks, revealing that the overall trace […]
Číst zprávu

Experimental and Computational 77Se NMR Spectroscopic Study on Selenaborane Cluster Compounds

The study investigates the correlation between calculated and measured 77Se NMR chemical shifts in various selenaborane cluster compounds, showing that low-level quantum chemical calculations can reliably predict these shifts. This predictive ability helps in understanding the molecular structure of selenaboranes and efficiently locating 77Se resonances in experimental data. The findings highlight how accurate prediction of […]
Číst zprávu

Catalytic dehalogenation with activated borane, a porous borane cluster polymer

Activated borane (ActB) is a metal- and halogen-free porous borane cluster polymer that effectively serves as a heterogeneous catalyst for hydrodehalogenation of aliphatic fluorides and chlorides, using triethylsilane as a reductant. It demonstrates high thermal stability, reusability, and significant Lewis acidity, making it capable of achieving full dehalogenation with high turnover numbers, even after multiple […]
Číst zprávu

A Direct Route to closo-SBnCln Thiaboranes: Chalcogen Bonding in SB5Cl5 vs. SB11Cl11 Crystals

Polyhedral boron chemistry exhibits various heteroatom substitution and a series of  heteroboranes thus being afforded Furthermore, the introduction of halogens instead of terminal hydrogens  enables the synthesis of small perhalogenated heteroboranes, stabilized through π back-donation. In this research, SB5Cl5 and SB9Cl9 clusters were prepared by co-pyrolysis of B2Cl4 with S2Cl2 at 280 °C in a […]
Číst zprávu