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Organically Templated Uranyl Sulfates and Selenates: Structural Complexity and Crystal Chemical Restrictions for
Elizaveta V Durova1, Ivan V Kuporev1, Vladislav V Gurzhiy1
1Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, Saint-Petersburg 199034, Russia.
This review explores organically templated uranyl sulfates and selenates, revealing structural complexity and limited isomorphic substitution. Organic cation size influences rare and complex uranyl compound topologies.
Area of Science:
- Inorganic Chemistry
- Crystal Chemistry
- Materials Science
Background:
- Organically templated uranyl sulfates and selenates are key synthetic U-bearing compounds.
- 194 known compounds incorporate 84 different organic molecules.
Purpose of the Study:
- To review the state of the art in the structural chemistry of these uranyl compounds.
- To analyze crystal chemical limitations and the impact of organic components on structure.
Main Methods:
- Structural studies and topological analysis of known uranyl sulfate and selenate compounds.
- Characterization of novel uranyl sulfate and selenate structures.
Main Results:
- Isomorphic substitution is limited, with isotypic phases confirmed in only 12% of compounds.
- Crystal structure is dictated by organic and oxyanion components, affecting topology.
- Larger organic cations with more functional groups yield complex topologies.
Conclusions:
- Structural diversity in uranyl sulfates and selenates is governed by organic and inorganic building blocks.
- Limited isomorphic substitution presents challenges in predictable crystal engineering.
- Novel uranyl compounds with isopropylammonium cations expand the known structural landscape.
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