Computational investigation of the Bi lone-pairs in monoclinic bismuth triborate BiB3O6
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Abstract
The Bi-O interactions and the Bi lone-pairs in monoclinic BiB3O6 are investigated with gradient-corrected hybrid B3PW density functional theory within the Gaussian-orbital-based CO-LCAO scheme. The Bi 6s and O 2p orbitals contribute to both bonding and antibonding interactions below the Fermi level. The stereochemical activity of the Bi lone-pairs was found to have a major origination from the primary interaction for the Bi 6s-O 2p antibonding orbital. The Bi 6p orbitals are not critically responsible for the non-spherical shape of the Bi lone-pairs, although they indeed participate into the secondary interaction with the Bi 6s-O 2p antibonding states. It is also suggested that O 2p components within the Bi lone-pairs are dominantly significant for the optical responses of BiB3O6 over the Bi 6s components.
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