Theoretical proposal of planar silicon oligomer and silicon benzene

This paper proposes theoretically a new silicon pi system where it electrons delocalize oil sp(2)-hybridized silicon backbone similar to carbon pi systems, based oil a careful insight into the difference in character between the carbon 2p and silicon 3p orbitals. We found planar and acyclic silicon oligomers and D-6h silicon benzene as equilibrium structures. The D-6h silicon benzene shows a large negative value of nucleus-independent chemical shift, which indicates that it is an aromatic molecule. (c) 2005 Elsevier B.V. All rights reserved.