Crystal structures of praseodymium nitrate complexes with urea, precursors for solution combustion synthesis of nanoscale praseodymium oxides

[Display omitted] •Molecular complexes crystallize in the Pr(NO3)3–urea–H2O system.•Nitrate ions serve as chelating ligands; urea and water molecules are monodentate.•Complexes are precursors in solution combustion synthesis of praseodymium oxides.•Combustion is preceded and followed by endothermic...

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Bibliographic Details
Published in:Polyhedron 2020-12, Vol.192, p.114875, Article 114875
Main Authors: Savinkina, Elena V., Karavaev, Igor A., Grigoriev, Mikhail S.
Format: Article
Language:English
Subjects:
Rare-earth nitrates
Rare-earth oxides
Thermal analysis
Urea
X-ray techniques
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Summary:[Display omitted] •Molecular complexes crystallize in the Pr(NO3)3–urea–H2O system.•Nitrate ions serve as chelating ligands; urea and water molecules are monodentate.•Complexes are precursors in solution combustion synthesis of praseodymium oxides.•Combustion is preceded and followed by endothermic decomposition of intermediates. Complexes of praseodymium nitrate with urea (Ur) can serve as precursors in solution combustion synthesis of nanoscale oxides. Two compounds, [Pr(Ur)2(H2O)2(NO3)3] and [Pr(Ur)4(NO3)3], were isolated and their crystal structures were studied. Combustion of congruently soluble [Pr(Ur)4(NO3)3] begins at ~330 °C and finishes at ~400 °C producing basic carbonate. For preparing Pr6O11 and Pr2O3, further annealing at higher temperature (>460 °C and >770 °C, respectively) is necessary.
ISSN:0277-5387
DOI:10.1016/j.poly.2020.114875