Theoretical description of alkali metal closo-boranes – towards the crystal structure of MgB12H12
文献信息
Aristea E. Maniadaki, Zbigniew Łodziana
Solid state closo-borane salts of alkali metals have very high ionic conductivity. This makes them interesting for practical applications as solid state electrolytes, and has triggered extensive research efforts. Improvement and understanding of their properties require accurate theoretical description of their static and dynamical properties. In this work, we report accuracy assessment of density functional theory in the description of solids with B12H122− anions. We show that these aromatic anions interact via weak dispersive forces. For that reason, non-local exchange–correlation functionals give better description of structural properties and phonons in Li2B12H12 and Na2B12H12. Numerically efficient semi-local methods provide satisfactory results when applied in structure volumes obtained in a non-local method. An extensive structural search for stable crystalline phases of MgB12H12 predicts a new denser lattice with C2/c symmetry that is stabilized by van der Waals interactions. These structures might be discovered as anhydrous MgB12H12 in high pressure experiments, avoiding the amorphous state at ambient pressures.
期刊推荐

Journal of Saudi Chemical Society

New Journal of Chemistry

Russian Journal of General Chemistry

Russian Journal of Organic Chemistry

Russian Journal of Bioorganic Chemistry

Crystallography Reports

Chemical Communications

Russian Journal of Coordination Chemistry

Saudi Pharmaceutical Journal

Organic Process Research & Development
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