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Synthetic approaches for noncentrosymmetric molybdates
Desmond J Hubbard1, Alexander R Johnston, Hernan Sanchez Casalongue
1Department of Chemistry, Haverford College, Haverford, Pennsylvania 19041, USA.
Inorganic Chemistry
|September 30, 2008
Summary
Researchers explored using chiral organic amines and molybdenum centers to create noncentrosymmetric materials. This study details the synthesis of new polyoxomolybdates and polyoxofluoromolybdates with controlled three-dimensional symmetry.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Crystallography
Background:
- Second-order Jahn-Teller active Mo(VI) centers are key components in designing novel materials.
- Crystallographic noncentrosymmetry is a crucial property for advanced material applications.
- Organic amines can template the formation of complex inorganic structures.
Purpose of the Study:
- To investigate the use of chiral organic amines and Mo(VI) centers for achieving crystallographic noncentrosymmetry.
- To explore reaction variables influencing the structure of polyoxomolybdates and polyoxofluoromolybdates.
- To demonstrate the control of 3D symmetry in new materials using chiral amines.
Main Methods:
- Mild hydrothermal synthesis conditions were employed.
- Composition space analysis was used to correlate reagent/solvent concentrations with molybdate structure.
- Systematic variation of amine structures (linear diamines, ethylenediamine derivatives) was performed.
Main Results:
- Eight new organically templated polyoxomolybdates and polyoxofluoromolybdates were synthesized.
- The influence of amine structure and fluoride addition on structural outcomes was determined.
- Chiral amines successfully directed the three-dimensional symmetry of the resulting materials.
Conclusions:
- Chiral organic amines are effective templates for controlling the crystallographic symmetry of polyoxomolybdate materials.
- Mild hydrothermal synthesis provides a viable route to novel noncentrosymmetric inorganic frameworks.
- The study expands the library of organically templated polyoxomolybdates and polyoxofluoromolybdates.
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