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Two additive-induced isomeric aluminoborates templated by methylamine
Gao-Juan Cao1, Jian Lin, Jin-Yun Wang
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, PR China.
Dalton Transactions (Cambridge, England : 2003)
|August 18, 2010
Summary
Researchers synthesized two novel aluminoborate isomers using methylamine as a structure-directing agent. These materials exhibit unique structures and promising nonlinear optical properties, specifically second harmonic generation.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Crystallography
Background:
- Aluminoborates are an important class of inorganic compounds with diverse structures and properties.
- Structure directing agents (SDAs) play a crucial role in controlling the formation of specific crystalline frameworks.
- Solvothermal synthesis is a versatile technique for creating novel inorganic materials.
Purpose of the Study:
- To synthesize and characterize new additive-induced isomeric aluminoborates.
- To investigate the structural features and topological properties of the synthesized compounds.
- To evaluate the nonlinear optical (NLO) properties, particularly second harmonic generation (SHG), of the novel aluminoborates.
Main Methods:
- Solvothermal synthesis using methylamine as a structure directing agent.
- Comprehensive characterization including elemental analysis, IR, TGA, and X-ray diffraction (powder and single-crystal).
- Investigation of optical properties via NLO determination, UV-vis spectroscopy, and electronic structure calculations.
Main Results:
- Two isomeric aluminoborates, (CH(3)NH(3))(2)(H(2)O)(2)[Al(B(5)O(10))] and (CH(3)NH(3))(H(2)O)[Al(B(5)O(10))], were successfully synthesized.
- The structures feature different arrangements of B(5)O(10) units and AlO(4) tetrahedra, forming diamond topologies with helical channels.
- Both compounds exhibit noncentrosymmetric and chiral space groups, displaying significant second harmonic generation efficiencies (approx. 2.0 times that of KDP).
Conclusions:
- Methylamine effectively directs the formation of unique isomeric aluminoborate structures.
- The synthesized aluminoborates possess interesting structural characteristics and promising nonlinear optical functionalities.
- These findings contribute to the development of new materials for optical applications.
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