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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
11.1K
Ruthenium(V) oxides from low-temperature hydrothermal synthesis
Craig I Hiley1, Martin R Lees, Janet M Fisher
1Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL (UK).
Angewandte Chemie (International Ed. in English)
|March 20, 2014
Summary
Researchers synthesized novel ruthenium oxides at low temperatures. These metastable compounds, including SrRu2O6 with high-temperature magnetic order, decompose easily when heated, posing challenges for conventional synthesis methods.
Area of Science:
- Solid-state chemistry
- Materials science
- Inorganic chemistry
Background:
- Ruthenium oxides are a class of materials with diverse electronic and magnetic properties.
- Low-temperature synthesis routes are crucial for accessing metastable phases not obtainable via conventional high-temperature methods.
Purpose of the Study:
- To report the low-temperature hydrothermal synthesis of three new ruthenium oxides: Ca1.5Ru2O7, SrRu2O6, and Ba2Ru3O9(OH).
- To characterize the crystal structures and magnetic properties of these novel compounds.
- To investigate the stability of the synthesized ruthenium oxides.
Main Methods:
- Low-temperature (200°C) hydrothermal synthesis.
- Synchrotron X-ray and neutron powder diffraction for structure determination.
- Magnetic susceptibility measurements and neutron powder diffraction for magnetic structure refinement.
Main Results:
- Ca1.5Ru2O7: A defective pyrochlore structure with mixed Ru(V/VI) oxidation states.
- SrRu2O6: A layered Ru(V) oxide adopting a PbSb2O6 structure, exhibiting antiferromagnetic order up to at least 500 K.
- Ba2Ru3O9(OH): A novel orthorhombic structure type.
- All synthesized ruthenates are metastable, decomposing upon heating to 300-500°C.
Conclusions:
- Successful low-temperature hydrothermal synthesis of three novel ruthenium oxides.
- Detailed structural and magnetic characterization reveals unique properties, including high-temperature magnetic ordering in SrRu2O6.
- The metastability of these compounds highlights the limitations of conventional high-temperature solid-state synthesis for their isolation.
Keywords:
X-ray absorption spectroscopyhydrothermal synthesismagnetic propertiesneutron diffractionruthenium
