The praseodymium hydrogenselenite Pr{sub 2}(HSeO{sub 3}){sub 2}(SeO{sub 3}){sub 2}: Synthesis, characterization, and crystal structure
- Instituto de Ciencia de Materiales de Madrid (Spain)
- Centre d`Elaboration de Materiaus et d`Etudes Structurales, Toulouse (France)
Crystal growth of praseodymium hydrogenselenite Pr{sub 2} (HSeO{sub 3}){sub 2}(SeO{sub 3}){sub 2} has been carried out by pseudohydrothermal synthesis. Its thermal decomposition gives rise to three new anhydrous rare-earth selenites, two of them isolated as tiny single crystals (Pr{sub 2}Se{sub 4}O{sub 11} and Pr{sub 2}Se{sub 3}O{sub 9}). The structure of Pr{sub 2}(HSeO{sub 3}){sub 2}(SeO{sub 3}){sub 2} has been solved in the orthorhombic symmetry, space group Pbc2{sub 1}, with unit-cell parameters a = 7.0471(8), b = 8.3480(8), and c = 18.987(3) {Angstrom}, and refined down to R = 0.040 and R{sub w} = 0.047. Two crystallographically independent types of Pr atoms were found, coordinated to 100, giving rise to a tetradecahedron or cis-bicapped cube. The four present Se atoms are coordinated at 3 O (Se1 and Se4) or at one OH and 2 O (Se2 and Se3), in the classical form of a trigonal pyramid. Each Se1 and Se4 are linked to five praseodymium atoms, two bidentate and three monodentate bonding, while each Se2 and Se3 only bond one time bidentately and monodentately with Pr2 and Pr1, respectively. The structure can be described as a layered one, the sheets containing all the praseodymium and selenite groups are interconnected by hydrogen selenite groups, via hydrogen bonding. This material was also characterized by IR spectroscopy and magnetic measurements.
- OSTI ID:
- 508701
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 112; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
Similar Records
Phase formation in the system CaO-SeO{sub 2}-H{sub 2}O
Syntheses and structures of three f-element selenite/hydroselenite compounds