Journal
SCIENCE CHINA-CHEMISTRY
Volume 53, Issue 8, Pages 1737-1745Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-010-4037-5
Keywords
density functional theory; octacoordinate; alkaline earth metal; aromatic; molecular orbital
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Funding
- National Natural Science Foundation of China [40925016, 40830101]
- National Basic Research Program of China [2009CB226109]
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Complexes involving planar octacoordinate alkaline earth metal atoms in the centers of eight-membered boron rings have been investigated by two density functional theory (DFT) methods. BeB82- with D-8h symmetry is predicted to be stable, both geometrically and electronically, since a good match is achieved between the size of the central beryllium atom and the eight-membered boron ring. By contrast, the other alkaline earth metal atoms cannot be stabilized in the center of a planar eight-membered boron ring because of their large radii. By following the out-of-plane imaginary vibrational frequency, pyramidal C-8v MgB82-, CaB82-, SrB82-, and BaB82- structures are obtained. The presence of delocalized pi and sigma valence molecular orbitals in D-8h BeB82- gives rise to aromaticity, which is reflected by the value of the nucleus-independent chemical shift. The D-8h BeB82- structure is confirmed to be the global minimum on the potential energy surface.
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