Understanding fundamental uranyl polyoxometalate
(POM) chemistry in solution and the solid state is
the first step to defining its future role in the development
of new actinide materials and separation processes
that are vital to every step of the nuclear fuel cycle. Many
solid-state geometries of uranyl POMs have been...
Understanding fundamental uranyl polyoxometalate
(POM) chemistry in solution and the solid state is
the first step to defining its future role in the development
of new actinide materials and separation processes
that are vital to every step of the nuclear fuel cycle. Many
solid-state geometries of uranyl POMs have been...
Small-angle X-ray scattering (SAXS) studies of aqueous [Ta₆O₁₉]⁸⁻
compared to prior studies of aqueous [Nb₆O₁₉]⁸⁻ reveals key
differences in behaviour, which is likely at the root of the difficultly
in developing polyoxotantalate chemistry. Specifically, where
contact ion-pairing dominates between [Nb₆O₁₉]⁸⁻ and its
counterions, solvent-separated ion-pairing between [Ta₆O₁₉]⁸⁻
and its counterions...
Small-angle X-ray scattering (SAXS) studies of aqueous [Ta₆O₁₉]⁸⁻
compared to prior studies of aqueous [Nb₆O₁₉]⁸⁻ reveals key
differences in behaviour, which is likely at the root of the difficultly
in developing polyoxotantalate chemistry. Specifically, where
contact ion-pairing dominates between [Nb₆O₁₉]⁸⁻ and its
counterions, solvent-separated ion-pairing between [Ta₆O₁₉]⁸⁻
and its counterions...
The Cs-effect states Cs⁺ has more covalent character in bonding interactions than the lighter alkalis. It is exploited in organic synthesis and influences behavior in water, most notably radioactive ¹³⁷Cs in nuclear wastes or the environment. Niobium polyoxometalates (Nb-POMs) provide a unique opportunity to probe aqueous phase ion-pairing responsible for...
The Cs-effect states Cs⁺ has more covalent character in bonding interactions than the lighter alkalis. It is exploited in organic synthesis and influences behavior in water, most notably radioactive ¹³⁷Cs in nuclear wastes or the environment. Niobium polyoxometalates (Nb-POMs) provide a unique opportunity to probe aqueous phase ion-pairing responsible for...
Solid-state ¹H magic-angle spinning (MAS) NMR was used to investigate local proton environments in anhydrous [UO₂(OH)₂] (α-UOH) and hydrated uranyl hydroxide [(UO₂)₄O(OH₆ 6·5H₂O (metaschoepite). For the metaschoepite material, proton resonances of the μ₂-OH hydroxyl and interlayer waters were resolved, with two-dimensional (2D) double-quantum (DQ) ¹H–¹H NMR correlation experiments revealing strong...
Solid-state ¹H magic-angle spinning (MAS) NMR was used to investigate local proton environments in anhydrous [UO₂(OH)₂] (α-UOH) and hydrated uranyl hydroxide [(UO₂)₄O(OH₆ 6·5H₂O (metaschoepite). For the metaschoepite material, proton resonances of the μ₂-OH hydroxyl and interlayer waters were resolved, with two-dimensional (2D) double-quantum (DQ) ¹H–¹H NMR correlation experiments revealing strong...
Ion pairs and solubility related to ion-pairing in water influence many processes in nature and in synthesis including efficient drug delivery, contaminant transport in the environment, and self-assembly of materials in water. Ion pairs are difficult to observe spectroscopically because they generally do not persist unless extreme solution conditions are...
The Cs-effect states Cs⁺ has more covalent character in bonding interactions than the lighter alkalis. It is exploited in organic synthesis and influences behavior in water, most notably radioactive ¹³⁷Cs in nuclear wastes or the environment. Niobium polyoxometalates (Nb-POMs) provide a unique opportunity to probe aqueous phase ion-pairing responsible for...