| Autor: |
Brannon, Jacob P., Bai, Zhuanling, Beck, Nicholas B., Gomez Martinez, Daniela, Hines, Tyler W., Wineinger, Hannah B., Whitefoot, Megan A., McKinnon, Noah C., Merinsky, Robert W., Valley, Ben J., Albrecht, Thomas E., Sperling, Joseph M. |
| Zdroj: |
Journal of the American Chemical Society; December 2024, Vol. 146 Issue: 51 p35216-35228, 13p |
| Abstrakt: |
To develop the structural chemistry of radium, the halide compounds RaX2·H2O and RaX2·2H2O (X–= Cl–and Br–) have been synthesized and characterized and serve as benchmarks for comparisons with more complex compounds in the future. In contrast with historic reports on the structural chemistry of radium, the Ra2+chlorides differ from their Ba2+analogues. For MCl2·H2O (M2+= Ba2+, Ra2+), the variance between the metal coordination environments manifests as a small, local distortion that becomes more apparent in the extended structure. However, differences between RaCl2·2H2O and BaCl2·2H2O are more pronounced with a 10-coordinate Ra2+cation being observed instead of a nine-coordinate Ba2+in BaCl2·2H2O. RaBr2·nH2O (n= 1 or 2) are isomorphous with the Ba2+analogues. Raman spectroscopy was used as an additional probe of these compounds and reveals substantial shifts and different vibrational modes between RaX2·H2O and RaX2·2H2O compared to BaX2·2H2O. |
| Databáze: |
Supplemental Index |
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