Publications by authors named "Samantha Stegman"
Numerous descriptions of structural isomerism in metal complexes do not list any molecular vs ionic isomers. At the same time, one of the most striking examples of structural isomerism in organic chemistry is molecular urea, which has the same atomic composition as the chemically distinct ionic ammonium cyanate. This iconic organic couple now meets its inorganic heterometallic counterpart.
View Article and Find Full Text PDFThe ternary oxides, LiNpO and LiNpO, were synthesized under mild hydrothermal conditions using concentrated LiOH solutions containing NpO(NO). The reactions resulted in the formation of single crystals of both compounds, enabling the determination of their single crystal structures for the first time. Exploration of the synthetic phase space demonstrates that the resulting neptunate phases are dependent on the concentration of LiOH, transitioning from LiNpO, containing a typical octahedral neptunyl geometry with two shorter Np≡O bonds, at lower LiOH concentrations to LiNpO with two long and four short Np-O bonds under saturated solution conditions.
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- Two new neptunium hydroxide compounds were synthesized using concentrated potassium and rubidium hydroxide, specifically K[(NpO)(OH)]·4HO and Rb[(NpO)(OH)]·2HO.
- The chemical structures of these compounds were determined through single-crystal X-ray diffraction, with Raman spectra also provided for analysis.
- The newly created compounds show different structural features, with K[(NpO)(OH)] having infinite chains and Rb[(NpO)(OH)] forming a three-dimensional framework, contributing to understanding the structural variety of neptunium(V) oxides and hydroxides.
The synthesis and single crystal structures of Am(iii) and Cm(iii) thiocyanate complexes are reported along with an isostructural series of lanthanide thiocyanate complexes. Because the complexes are isostructural, a comparative study of the metal-thiocyanate bonds was conducted using Raman spectroscopy indicating very similar and electrostatic metal-ligand interactions.
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- Hydrofluxes are special hydrated salts that allow for chemical reactions at mild temperatures and pressures, making them ideal for material synthesis.
- This text discusses how alkali metal hydroxide hydrofluxes were used to create single crystal α-Na NpO, providing detailed structural and spectral analysis of the produced material.
- The research aims to enhance the understanding of complex actinide oxides, especially transuranium materials, by allowing for the exploration of their structure-property relationships under favorable conditions.