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Article Abstract
By utilizing zinc amalgam as an in situ reductant and pH regulator, mild hydrothermal reaction between UO(CHCOO)·2HO, HSO, and CsCO or between UO(CHCOO)·2HO, CH(SOH), and KCO yielded a novel cesium U sulfate trimer Cs[UO(SO)]·2.2HO (1) and a new potassium U disulfonic hexamer K[UO(OH)(HO)][CH(SO)]·6HO (2), respectively. Compound 1 features a lamellar structure with a honeycomb lattice, and it represents an unprecedented trimeric U cluster composed of purely inorganic moieties. Complex 2 is built from hexanuclear U cores and K ions interconnected by μ-[CH(SO)] groups, leading to the construction of an extended framework rather than commonly observed discrete, neutral molecular sulfonate clusters. The various binding modes of the sulfate and disulfonate groups, especially the multidentate ones, enable additional bridging between metal ions, which promotes oligomerization and isolation of polynuclear species. Furthermore, compound 1 exhibits both ion-exchange properties and the Alexandrite effect, and it is the second example of a uranium complex without chromic functional ligands displaying the latter feature.
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