| Currently, there is no general accepted method for Cesium ion removal from high-level radioactive waste (HLW). Selective removal of cesium ions proves to be difficult due to the presence of high concentrations of Na + and K+ ions. An understanding of the molecular interactions that stabilize guest-host complexes may be useful in future compounds designed for trapping specific guests.; Typically, X-ray diffraction methods are used to determine structures of solids from a crystal. When it becomes difficult to grow a crystal, solid-state NMR is a good complimentary method to X-ray techniques in determining structural information of many types of materials. Rotational-Echo, Double-Resonance (REDOR) is a widely accepted structural tool used for extracting distances in solids. The results show 133Cs nucleus is contained within the calixarene. Also, 13C-2D REDOR experiments are described which may be used to aid in 13C spectral assignments of host compounds, especially when there is difficulty assigning resonances. |
