title: The closo-Si12C12 molecule from cluster to crystal: A theoretical prediction.
abstract: The structure of closo-Si12C12 is unique among stable SinCm isomers (n, m > 4) because of its high symmetry, π-π stacking of C6 rings and unsaturated silicon atoms at symmetrical peripheral positions. Dimerization potential surfaces reveal various dimerization reactions that form between two closo-Si12C12 molecules through Si-Si bonds at unsaturated Si atoms. As a result the closo-Si12C12 molecule is capable of polymerization to form stable 1D polymer chains, 2D crystal layers, and 3D crystals. 2D crystal structures formed by side-side polymerization satisfy eight Si valences on each monomer without large distortion of the monomer structure. 3D crystals are formed by stacking 2D structures in the Z direction, preserving registry of C6 rings in monomer moiety.
authors.affiliation: Air Force Research Laboratory DoD Supercomputer Resource Center, Wright-Patterson Air Force Base, Ohio 45433, USA.
authors.forename: Xiaofeng F
authors.initials: XF
authors.lastname: Duan
authors.affiliation: Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio 45433, USA.
authors.forename: Larry W
authors.initials: LW
authors.lastname: Burggraf