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New mixed alkaline-earth nitridomolybdate(VI) nitride oxides with anion-ordered sub-structures
Charles F Baker1, Marten G Barker, Claire Wilson
1School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
Dalton Transactions (Cambridge, England : 2003)
|July 15, 2004
Summary
Researchers synthesized novel molybdenum(VI) nitride oxides, creating the first mixed alkaline earth metal compounds. These new materials feature complex triclinic crystal structures with isolated [MoN4](6-) tetrahedra.
Area of Science:
- Solid-state chemistry
- Inorganic materials science
- Crystallography
Background:
- Molybdenum nitride oxides are an emerging class of materials with unique electronic and structural properties.
- The synthesis of mixed alkaline earth metal nitride oxides presents significant challenges due to cation size and charge differences.
Purpose of the Study:
- To synthesize and characterize new molybdenum(VI) nitride oxides containing mixed alkaline earth metals.
- To determine the crystal structures of these novel compounds and understand their structural features.
Main Methods:
- High-temperature synthesis in sealed stainless steel crucibles.
- X-ray diffraction for single-crystal structure determination.
- Chemical composition analysis.
Main Results:
- Successful synthesis of two new mixed alkaline earth molybdenum(VI) nitride oxides: Ca38Sr13[MoN4]12N8O3 and Ca36Sr15[MoN4]12N8O3.
- Determination of complex triclinic crystal structures (space group P1) for both compounds.
- Identification of isolated [MoN4](6-) tetrahedra and an ordered arrangement of nitride and oxide anions.
Conclusions:
- The synthesized compounds represent the first examples of mixed alkaline earth metal nitride oxides.
- The crystal structures reveal unique coordination environments for oxide anions, exclusively bonded to alkaline earth metals.
- These findings expand the compositional and structural diversity of nitride oxide materials.